Past Annual Meetings:
6th Annual Meeting, Cornwall, PEI,
October 22-25,
2001
Presentation Abstracts | Poster
Abstracts | Photos | Award
Recipients
Presentation Abstracts
The following are the abstracts from the 6th annual meeting. Abstracts are organized in alphabetical order by first author's last
name.
Abstracts of the presentations are available in print form
through CARCNET. Please contact us.
Special Session: A history of Canadian herpetology, with the "Father and Son" of
modern Canadian herpetology.
- Toward a history of 400 years of
herpetological inventory and monitoring in Canada: I. Pre-Bleakney
1600-1950 and II. Post-Bleakney
1960-2000. -
Cook
- Confessions of a Reformed
Herpetologist. - Bleakney
Keynote Lecture:
- New insights into the biology of leatherback turtles (Dermochelys
coriacea) in the Northwest Atlantic. - James
Presentations:
-
Species richness and turnover rate of amphibians in northern Ontario. -
Abbott
- The Vermont Reptile and Amphibian Atlas: progress just
south of the border.-Andrews
- The effect of handling stress on deformity rate and
hatching success in the Common Snapping Turtle, Chelydra serpentina
serpentina, from Algonquin Provincial Park and Hamilton Harbour, Ontario
Canada: do traditional laboratory incubation methods mirror naturally
nesting populations? - Ashpole
- Predicting the landscape-scale distribution of
red-spotted newt (Notophathalmus viridescens) habitat in New Brunswick,
Canada. - Betts
- Status of the Oregon Spotted Frog (Rana pretiosa) in
Canada. - Bishop
- Global status of amphibian populations and amphibian
research initiatives in Canada. - Bishop
- Reproductive status of six amphibian species at Mont
St. Hilaire, Qu�bec. - Bol
- What do we know, not know and need to know about the
conservation biology of Canadian reptiles? -
Brooks
- Turtle population sizes and hatchling success at Point
Pelee National Park. - Browne
- Another frog monitoring attempt: Big Rideau Lake Rana
1999-2000. - Cook
- BC's Northern Leopard Frogs: Towards recovery. -
Cunnington
-
Biology and conservation status of the Sharp-tailed Snake, Contia tennuis -
Cunnington
- The Prince Edward Island Frogwatch Program. -
Curley
- Characteristics, movements, and health of a Western
Chorus Frog (Pseudacris triseriata) population at a breeding pond in
southwestern Qu�bec. - Desroches
- Demographics of yellow-spotted salamanders (Ambystoma
maculatum) in relation to agricultural land use in Nova Scotia. -
Eaton
- Methods for the Induction of Breeding in the Northern
Leopard Frog, Rana pipiens.- Edginton
- Abundance and distribution of amphibians in selected
aquatic habitats of Prince Edward Island. - Field
- The developing frog hypothalamus as a sensor for
estrogenic EDCs. - Gallant
- Differences in Size, Pigmentation and Fluctuating
Asymmetry in Stressed and Nonstressed Northern Leopard Frogs (Rana
pipiens). - Gallant
- Reptile health and disease: a Canadian perspective;
Sant� et maladies chez les reptiles: une perspective canadienne. -
Galois
- The Wood Turtle, Clemmys insculpta, at River Denys: A
second population for Cape Breton Island, Nova Scotia.Gr�f
- The species richness, abundance, and diversity of
amphibians in terrestrial habitat fragments of Prince Edward Island. Hartling
- Nested herpetofaunal assemblages on islands: lessons
for conservation. - Hecnar
- Reptilian conservation can brush against, but cannot
afford to shake hands with uncertainty: Reasons why long-term life history
research must precede wildlife conservation efforts for long-lived
reptiles in Canada. - Hollett
- Estimating northern limits in Canadian turtles: a
method to estimate historical and potential distribution? -
Holt
- Marine turtles and the Canadian Atlantic pelagic
fishery: a previously unrecognized potential source of sea turtle
mortality. - McAlpine
- Amphibian species richness and distribution in
northwestern Ontario: is hydroperiod important? - Robinson
- Species totemization in herpetological conservation.
- Schueler
- Pseudacris triseriata on the Five-Mile Block (Tobermory,
Bruce County, Ontario): 1984-2001. - Schueler
- The Western Chorus Frog - declining but not at risk? -
Seburn
- Do we need a National amphibian and reptile database? -
Seburn
- Red-sided garter snake (Thamnophis sirtalis parietalis)
relocation and education project. - Takats
- Current status of the Nova Scotia Herpetofaunal Atlas. -
Taylor
- Growth rates and deformities of green frogs and leopard
frogs from areas differing in agricultural intensity on Prince Edward
Island. - Teather
- Multiple
stressor effects on native amphibians. - Thompson
- Comparative
phylogeography of the Pacific Northwest: Community history as a guide to
conservation science. - Thompson
- Hyla Park: Lessons learned in the establishment of an
amphibian conservation area in a semi-urban setting. - Vail
- Painted Turtles (Chrysemys picta) of Vermont: an
examination of phenotypic variation and intergradation. -
Wright
Poster Presentations:
-
Analyses of gross morphological deformities of the Common
Snapping Turtle (Chelydra serpentina serpentina) in Algonquin
Provincial Park, Ontario. - Browning
-
The effects of UV-B radiation and octylphenol (OP) on growth,
metamorphosis and survival in the northern leopard frog (Rana
pipiens). - Croteau
-
Northern leopard frog reintroduction project. -
Kendell
-
FROGWATCH CANADA: Conservation & education with the Canadian
Nature Federation and the Ecological Monitoring and Assessment
Network. - Kilvert
-
Amphibian and Reptile Monitoring and Management in Alberta. -
Takats
-
Comparative assessment of techniques for sampling native
salamanders in riparian zones of boreal mixed wood forests: Proposed
research. - Truant
-
Indirect and multiple stressor effects of glyphosate and
triclopyr herbicides on native larval amphibians (Rana pipiens and
R. clamitans) in two wetland ecosystems in northern Ontario,
Canada. - Wojtaszek
Species richness and turnover rate of amphibians in
northern Ontario
Virginia A. Abbott, Shannon Maronese and Stephen J. Hecnar
Department of Biology, Lakehead University, 955 Oliver Road, Thunder Bay,
ON P7B 5E1
The importance of studies in amphibian population
ecology is increasing as evidence of a global decline accumulates.
Explaining patterns of species richness, species turnover and spatial
dynamics is an important step in understanding and preventing further loss
of amphibian species. Although amphibian populations have been
investigated in many parts of the world, their status is essentially
unknown in the boreal forest biome of Northern Ontario. Our primary goal
was to assess the status of amphibians in the Thunder Bay District of
Northern Ontario. We repeatedly surveyed 41 ponds from 1999 to 2001 and
recorded the presence or absence of amphibian species. Day surveys
included walking, wading or dip netting within and around the ponds. Night
surveys consisted of listening and identifying calls. In Northern Ontario,
species richness and turnover rates were compared using paired t-tests.
Mean species richness was higher in 2001 than in previous years, and
turnover rate was low and stable between 1999 and 2001. Species richness,
turnover rate and incidence were estimated and compared with previous
studies that were conducted in Southern Ontario. There was no difference
in species richness or turnover rate between Northern and Southern
Ontario; however, the proportion of the regional species pool
present at local sites differed significantly between the two regions.
Patterns of regional species incidence also differed significantly between
Northern and Southern Ontario. Further study of species richness and
turnover in relation to local and landscape characteristics may better
define the role of habitat in determining the persistence of amphibian
populations.
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The Vermont Reptile and Amphibian Atlas: progress
just south of the border
James S. Andrews
Biology Department, Middlebury College, Middlebury, Vermont 05753
The Preliminary Atlas of the Reptiles and Amphibians of
Vermont was published in 1995. A new Atlas will be available this winter.
New maps will be visible on our website in November at www.middlebury.edu/herpatlas.
Since the Preliminary Atlas, we have had 1,478 contributors add 12,141 new
records of 40 native species. Seven species of turtle, 1 lizard, 11
snakes, 10 salamanders, and 11 species of frog have been documented.
Currently 15 or more species have been reported from 102 Vermont towns,
with a high of 30 reported from one town. Data for The Vermont Reptile and
Amphibian Atlas are provided through a collaboration of organized and
independent individuals and groups, professionals, paid field staff, and
government and non-government organizations with financial support from
both the government and the private sector. The mapping unit is the
township, based on its relative stability and ease of determination for
volunteers. All data are carefully reviewed before being added to the
Vermont Herp Database. Distributions of species along this portion of the
southern Quebec border are being clarified. Although we have made much
progress, there are still gaps that need to be filled, particularly for
reptiles.
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The effect of handling stress on deformity rate and
hatching success in the Common Snapping Turtle, Chelydra serpentina
serpentina, from Algonquin Provincial Park and Hamilton Harbour, Ontario
Canada: do traditional laboratory incubation methods mirror naturally
nesting populations?
Sara L. Ashpole1, C.A. Bishop2 and R.J. Brooks1
1 Department of Zoology,
University of Guelph, Guelph. Ontario N1G 2W1
2 Canadian Wildlife Service, Delta, British
Columbia V4K 2N2
Over the years, eco-toxicology field research conducted
on snapping turtles has supported that both hatching success and deformity
rates are sensitive biomarkers of persistent organic pollutants in the
environment. In this study, we examined two sites with contrasting levels
of contaminants, Hamilton Harbour (heavy industry with moderate to high
levels of contaminants) and Algonquin Provincial Park (very low to
non-detectable levels of contaminants) and the contribution of handling
stress on embryo development. Handling stress can include: the physical
removal of developing embryos from a maternally selected nest into an
artificial environment; the transportation of embryos to the laboratory;
and the incubation of embryos at a constant and very unnatural
temperature. We hypothesise that if undisturbed naturally nested embryos
develop in the same manner as those under laboratory conditions, then we
would predict that their hatching success and deformity rates to be the
same. To test this, our study was designed to compare undisturbed
predator-protected natural nests with artificially incubated embryos. From
both study sites, nests were either undisturbed and protected (N=10,
Hamilton Harbour; N=7, Algonquin Park) or collected (N=15 from each site).
One-third of each collected clutch was redistributed into the following
treatments: a predator protected artificial buried nest; and artificial
incubation at both a male- and female-producing temperature, 25.0�C
or 29.5�C respectively. Comparisons between
treatments and the study sites are in progress and will be discussed at
the conference.
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Predicting the landscape-scale distribution of
red-spotted newt (Notophathalmus viridescens) habitat in New
Brunswick, Canada
M. Betts1 and G. Forbes2
1 Greater Fundy Ecosystem Research Group
2 University of New Brunswick, Fredericton,
N.B
The diversity and complexity of forest ecosystems has
motivated many wildlife managers and conservation biologists to rely on
the �indicator species� approach for the measurement and monitoring
�ecosystem health� and �biodiversity�. By managing for a range of
indicator species, it is often assumed that other species with similar but
less stringent habitat requirements will also be protected. Because
amphibians tend to be sensitive to subtle habitat changes at both local
and landscape scales, they potentially serve as excellent indicators.
Through a review of the existing scientific literature we complied a list
of both stand-level and landscape-level habitat requirements for red
spotted newt. With the use of a Geographic Information System (GIS) we
predicted the distribution of this species in the northwestern region of
New Brunswick (the Saint John River Ecodistrict). Our analysis revealed
that while many patches are isolated by agricultural development and
recent forest harvesting, enough forest currently exists in young age
classes to serve as potential �dispersal habitat� for this species.
Nevertheless, landscape configuration may be precariously close to a
minimum threshold, below which the viability of newt habitat will decline.
Such hypotheses need to be tested by collecting more detailed information
about the local habitat requirements for a range of amphibian species, and
conducting extensive landscape-scale surveys of species that are
potentially sensitive to habitat fragmentation.
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Status of the Oregon Spotted Frog (Rana pretiosa) in
Canada
C.A. Bishop and R. Haycock
Canadian Wildlife Service, 5421 Robertson Road Delta, BC V4K 3N2
The Oregon Spotted Frog is COSEWIC listed as endangered
in Canada. The adult population is estimated at 348, based on egg mass
counts in spring 2001 and an assumption of a 1:1 sex ratio. This
represents a slight increase from 298 adults estimated in 2000. Embryonic
survivorship from egg to hatching was greater than 75% in 28 of 31
clutches monitored whereas survivorship was less than 25% in 3 of 31
clutches. Eggs died without evidence of a cause. In the past year,
approximately 3000 m2 of new habitat for the Oregon spotted
frog and other amphibians was created serendipitously by sculpting a bore
hole into a wetland where sediment and gravel was removed to build a
salmon spawning channel. By removing the gravel and sediment, reed canary
grass (Phalaris arundinacea) which is an invasive species of plant,
was removed from the edge of a wetland and the site could be designed with
a littoral zone and re-planted with native plants condusive to spotted
frog habitat. This was a rare case where the creation of sport fish
habitat benefited amphibians. A radio telemetry study was initiated on
this species to better understand its movement patterns and overwintering
locations. To date, adult Oregon spotted frogs moved less than 2 km from
the spawning sites where the frogs were caught during breeding season in
March 2001.
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Global status of amphibian populations and
amphibian research initiatives in Canada
Christine Bishop, Ronald Brooks, Brian Craig, Andrew Didiuk, Samara
Eaton, David Green, Russ Haycock, Kevin Judge, Donald McAlpine, Martin
Ouellet, Bruce Pauli, Danna Schock, Carolyn Seburn, David Seburn, Leonard
Shirose and Sara Swanson
Canadian Wildlife Service 5421 Robertson Road Delta, BC V4K 3N2
In Canada, four species or sub-populations of species of
amphibians are listed as endangered, ten are listed as special concern and
one species is listed as threatened. However, even common species of
amphibians continue to be stressed by habitat loss throughout Canada. For
example, although we do not know why four species have disappeared from
the Mont Saint-Hilaire Biosphere Reserve, we do know that re-colonisation
from the surrounding fragmented and degraded landscape is impossible.
While recent research in Canada examines the impact of contaminants, and
disease on amphibians and recovery teams exist for the 'listed' species,
there are still only two long-term mark-recapture population studies of
amphibians (Bufo fowleri and Rana catesbeiana, R.
clamitans and R. septentrionalis) underway in Canada. In July
2001, a symposium on global amphibian declines reported updates on
amphibian populations throughout the world and the current understanding
of chytridiomycosis, ultra-violet radiation and climate change on
amphibians. A highlights of this meeting in the context of the Canadian
situation will be presented.
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Confessions of a Reformed Herpetologist
Sherman Bleakney
PO Box 456, Wolfville, N.S. B0P 1X0
How two boys from Wolfville managed to dominate Canadian herpetology for
half a century. Presentation will include world premier of revealing
archival photos, and explain how working with sea turtles leads logically
to sea slugs.
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Reproductive status of six amphibian species at Mont
St. Hilaire, Qu�bec
Leslie Bol and David Green
McGill University Redpath Museum 859 Sherbrooke St. W Montreal, Quebec H3A
2K6
The breeding and reproductive success of six amphibian
species was monitored from April 30 to August 28, 2001 at Mont St.Hilaire,
Qu�bec. Twenty-five aquatic sites were visited on a weekly basis to
determine where breeding occurred for blue-spotted salamanders (Ambystoma
laterale), spotted salamanders (Ambystoma maculatum), American
toads (Bufo americanus), gray treefrogs (Hyla versicolor),
spring peepers (Pseudacris crucifer) and wood frogs (Rana
sylvatica). The aquatic sites included temporary ponds, permanent
ponds and a 3 ha lake. Five sites dried up without any breeding occurring.
Breeding as determined either by the presence of eggs or tadpoles occurred
at 8 sites for A. laterale, 13 sites for A. maculatum, 3
sites for B. americanus, 1 site for H. versicolor, 9 sites
for P. crucifer, and 16 sites for R. sylvatica. Reproductive
success as determined by the presence of metamorphs occurred at 3 sites
for A. laterale, 2 sites for A. maculatum, 2 sites for B.
americanus, 1 site for H. versicolor, 6 sites for P.
crucifer, and 3 sites for R. sylvatica. Reproductive failure
occurred at the other sites because of pond desiccation. There was no
single site where reproduction was successful for all six species. Pond
hydro period is an important determinant of reproductive success for
amphibian species.
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What do we know, not know and need to know about the
conservation biology of Canadian reptiles?
Ronald J. Brooks
Department of Zoology, University of Guelph, Guelph, Ontario N1G 2W1
Scientific knowledge of our 45 species of reptiles
varies from extensive for a few species such as blue racer, massassauga,
black ratsnake and snapping turtle to none as in the smaller snakes, the
queen, eastern hog-nosed, night and sharp-tailed snakes. Overall, about
half of our reptiles have not been favoured with a single study and we
have no data on distribution or abundance of any reptiles before European
settlement and only scattered anecdotal data before 1960.
Recent documents that summarize or describe the biology
and conservation of Canadian reptiles rarely acknowledge our scientific
ignorance of key aspects of biology relevant to conservation such as
population abundance and trends, life-history measures including age at
maturity, age-specific mortality rates and genetic structure, and
historical distribution and abundance. Instead, the numerous websites,
regional faunal compendia and status assessments of the taxon are
superficial, repetitive of one another and packed with clich�s about
ecological integrity, habitat loss, anthropogenic impacts and ecosystem
functions of reptiles and advocate restoration based on inadequate data
and irrelevant experiences with other taxa.
To conserve our reptiles, we need studies with the
following features:
- Long-term with intense mark-recapture and tracking
of reproductive and mortality rates.
- Development, to the limited extent possible, of
knowledge of historical abundance and distribution.
- Determination of the impact of roads on snake and
turtle populations, to test whether any snake or turtle population
can survive near well-travelled roads.
- A concerted effort to delete the worst buzzwords
(see above) from all discussions of reptile conservation, to use
"volunteer monitoring" only under rigorous planning and
control and to reduce antipathy to good, hypothesis testing.
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Turtle population sizes and hatchling success at
Point Pelee National Park
Connie L. Browne, Carol L. Browne and Stephen J. Hecnar
Department of Biology, Lakehead University, 955 Oliver Road, Thunder Bay,
ON P7B5E1
Turtle populations in Point Pelee National Park,
Ontario, are believed to be declining. Possible causes of decline are:
predation (mostly raccoon), road mortality, contaminants, isolation, and
collection. The last population study was in 1972-1973, so the
current status of turtle species is unknown. Turtle species native to the
park are snapping, painted, map, musk, Blanding�s, spotted and spiny
softshell. Box turtles, wood turtles and red-eared sliders have
occasionally been observed but are considered to be introduced. A study in
1997 found predation on turtle nests to be high (87%), however no actions
have been taken. The objectives of this study are to determine which
species are present, their respective population sizes, and to compare
hatchling success in areas of different amounts of contaminants when nests
are protected from predation. Sixteen sites were selected and turtles were
trapped using baited hoop traps and basking traps for mark and recapture.
Three sessions were completed from June to August 2001. Five species have
been found: painted, snapping, Blanding�s, map and musk turtles. The
spotted turtle is believed to be extirpated (last sighted 1990).
Preliminary results indicate that populations have a top heavy
age-structure. Snapping and painted turtle populations still appear to be
large, however they are male biased.
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Toward a history of 400 years of
herpetological inventory and monitoring in Canada: I. Pre-Bleakney
1600-1950; II. Post-Bleakney 1960-2000
Francis R. Cook
Researcher Emeritus Canadian Museum of Nature, Ottawa,
Ontario K1P 6P4
I. During 1600-1758 only anecdotal comments were
recorded on the amphibians and reptiles. After the 1758 (tenth) edition of
Linnaeus's Systema Naturae, which provided a stable nomenclature,
the defining and naming of amphibians and reptiles native to Canada,
because they are also abundant and widespread to the south, was first
based on U.S. specimens. Lists of species in the Maritimes, Ontario and
Quebec using these names came from local naturalists, in the west from
staff of the boundary surveys whose collections went to the British
Museum. United States biologists soon came north, Agassiz from Harvard
College to Lake Superior in 1850, Kennicott of the Smithsonian Institution
to the Hudson Bay Territories in 1859 Preble of the United States
Biological Survey to the Mackenzie region in 1908. Meantime, in 1843 the
Geological Survey of Canada was created and soon included a museum that
was to become the National Museum of Canada in 1927. Its first staff
naturalist, John Macoun, was appointed in 1882; his first amphibian and
reptile specimens were sent to the United States for identification but
those from 1885 were retained in Canada. Clyde Louis Patch was hired as
taxidermist in 1913, and added herpetologist in 1918. Provincial museums
had begun in Nova Scotia, New Brunswick, and British Columbia in the
1800s, in the prairie provinces in the early 1900s, and in Ontario as the
Royal Ontario Museum in 1914. In the 1920s Eugene Bernard Shelly Logier
was hired as an artist at the Royal Ontario Museum, founded in 1914, and
eventually became herpetologist later in the decade. In the 20th century
comprehensive guides to provincial herpetofaunas began to appear, Logier
for Ontario in 1937 (amphibians) and 1939 (reptiles), and Carl for British
Columbia (1943, 1944) and Melancon for Quebec (1950). The first list of
all amphibians and reptiles known for Canada by was by E. B. S. Logier and
G. C. Toner (1942) followed by a an annotated list by Mills (1948). Yet to
come in the 1950s was Logier's Frogs, toads and salamanders of eastern
Canada in 1952, and Snakes of Ontario in 1958, and Logier and Toner's
Checklist for Canada with the first spot distribution maps did not appear
until 1955, and Logier's Snakes of Ontario in 1958. Patch had died in
1952, the amphibians and reptiles of Canada he had begun as early as the
1920s uncompleted, and although he left distribution files and a curated
collection of some 5,000 specimens no manuscript was included.
II. In 1961 Logier and Toner published a revision of
their checklist, and Logier retired from the Royal Ontario Museum. The
Toronto group of the herpetologically inclined formed the previous year
the Canadian Amphibian and Reptile Conservation Society to promote a
better public feeling for these vertebrates. They published my first
Canadian list of endangered species in 1964. Barbara Froom wrote popular
treatments of Canadian snakes, turtles and amphibians. At the National
Museum of Canada, I carried on field surveys in Manitoba, Saskatchewan,
Alberta, and eastern British Columbia (1959-1970), and the museum funded
expeditions in central Quebec by David Gordon and central British Columbia
by Don Rivard in the mid-1970s, and Fred Schueler began his surveys in
1972, extending them from Newfoundland to Queen Charlotte Islands in B.C.
and depositing substantial collections of amphibians and reptiles in the
National Museum. Bleakney had doubled Patch's National Museum collections
from 7,000 to 14,000 specimens, from 1959 to 1991 the National collections
grew to 133,000 specimens, 89% Canadian material. I published a guide to
the amphibians and reptiles of Saskatchewan in 1966, the analysis of P.E.I.
in 1967, and an introduction to amphibians and reptiles of Canada in 1984.
Gorham wrote a guide for New Brunswick in 1970, Preston for Manitoba in
1982, Gilhen for Nova Scotia in 1984, Green and Campbell (amphibians), and
Gregory and Campbell (reptiles) wrote new guides to the B.C. in 1984, and
finally Russell and Bauer in Alberta in 1992. Although the Manitoba Museum
appointed a herpetologist (Bill Preston) in the late 1960s and the Royal
Ontario Museum (Bob Murphy) and New Brunswick (Don McAlpine), all have
either had to dilute their herpetological responsibilities with
responsibilities for other fields as well (Preston and McAlpine) or have
had interests primarily outside Canada (Murphy). Meanwhile, universities
began to appoint herpetologists who have made major contributions to
Canadian studies particularly in life history in the last quarter of the
20th century, and with the advent of growing concern of endangered species
and declines in others provincial wildlife departments and the federal
Environment Canada began to fund studies, and particularly Atlases,
notably the Ontario Herpetofaunal Summary and the Quebec Atlas project.
Monitoring projects involving the public have been sponsored by government
departments and non-governmental organizations such as the Metropolitan
Zoo in Toronto and the Ecomuseum in Ste-Ann-de-Bellevue. The first
national Canadian herpetological society, CARCS, faded and the Association
of Canadian Herpetologists arose in the 1980s followed by the Canadian
Amphibian and Reptile Conservation Network in the 1990s. In 1958, Bleakney
had posed 8 "unsolved problems" in Canadian herpetological
zoogeography, over 40 years later, a few have been clarified, but many
remain to be studied in greater depth.
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Another frog monitoring attempt: Big Rideau Lake Rana
1999-2000
Francis R. Cook
Canadian Museum of Nature, Ottawa, Ontario
The Rideau River flows north to Ottawa from the height
of Land between Lake Ontario and the Ottawa River drainages in
southeastern Ontario and has been the focus of a multidisciplinary study
by the Canadian Museum of Nature. Rana were sampled at two upper
locations with the assistance of staff and summer students from the Big
Rideau Lake Association for three years (12 days in 1999), 18 in 2000, and
22 in 2001), split equally each year between MacDonalds Island and Port
Elmsley. Primary objectives were to (1) assess estimation of mark-release
of frog population sizes using previously inexperienced collectors in
diurnal surveys of open river habitat over varying numbers of days and
paticipants, (2) to survey these populations for incidence of malformed
frogs; (3) to generate representative weights, body and tibia lengths, eye
and tympanum diameters as a baseline for comparison with past and future
sampling at these localities and elsewhere, in part to detect departures
indicative of populations in difficulty. Of six species of Rana
which occur in eastern Ontario, R. catesbeiana, R. clamitans,
and Rana pipiens were common at both study sites. Because large
river edge habitats were sampled, only a single R. sylvatica was
taken. Absent were R. septentrionalis which occurs in creeks
draining into the Rideau and adjoining watersheds to the north of the
study area, but apparently never in the main Rideau River, and R.
palustris which is restricted largely to woodland streams and adjacent
habitat southwest and north of the Rideau Lakes sites; former Ottawa
populations were likely extirpated by the 1920s. In 1999, 2000, 2001: 182,
170, 70 individuals of the three study species were injected with PIT
tags, and 398, 231, 909 only toe-clipped. Analysis of data is incomplete
but recaptures in the three years were only 28, 76 (9 first marked in
1999), and 279. Deformities were rarely noted: eye missing (1), limb
missing (1), and naturally shortened toes (3), all likely due, like other
wounds, to failed predation. Adult Bullfrog size distribution at the study
sites may be suggestive of unexploited populations. Mean size of breeding
Green Frogs may be less here and elsewhere when they occur with Bullfrogs
elsewhere where the latter are absent.
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BC�s Northern Leopard Frogs : Towards
recovery
David Cunnington1, Doug Adama, and the Northern Leopard Frog
(Southern Mountain Population) Recovery Team
1 3151 Glasgow St, Victoria, British Columbia
V8X 1L8
Since the 1970�s, Northern Leopard Frogs (Rana
pipiens) have declined across the western extent of their range. Prior
to their decline, Leopard Frogs could be found in the productive marshes
of the Kootenay and Columbia River systems of BC. By the early 1990�s
they were thought to be extirpated from the province altogether. In 1996,
a survey for amphibians found a population of Leopard Frogs still
surviving in the Creston Valley, and further surveys concluded that BC�s
entire population is confined to a single wetland compartment in the
Creston Valley Wildlife Management Area. The population is extremely small
(fewer than 20 breeding females), and may be susceptible to diseases. In
2000, several individuals were killed by chytrid fungus (Batrachochytrium
dendrobatidis). In 2001, 8 of 12 egg masses contained dead embryos
infected with the water mold Saprolegnia spp and the bacteria Aeromonas
hydrophilla.
In 2000, the Columbia Basin Fish and Wildlife
Compensation Program initiated a recovery project to secure the existing
population and increase their distribution and abundance. A provincial
recovery team was established in 2001, and progress was made on developing
a formal recovery plan. A small-scale captive rearing program was
initiated in 2001, and approximately 500 froglets were raised from eggs
that were not killed by the bacteria or fungus. Based on the success of
this effort, the captive rearing facility will be expanded in 2002. The
frog�s habitat use is also being studied, with the objective of
identifying potential areas for reintroduction.
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Biology and Conservation Status of the
Sharp-tailed Snake, Contia tenuis
David Cunnington*, and Kristiina Ovaska
*3151 Glasgow St, Victoria, BC, V8X 1L8
The Sharp-tailed Snake (Contia tenuis) is a
small, rare snake that has only been found at eight locations in BC. All
but one of these locations are from Southern Vancouver Island and the Gulf
Islands, and these places typically face south, in or near small openings
in Douglas-fir/Arbutus forests. The snakes are rarely seen at most of
these sites, and in general, very little information is available on the
distribution and size of Canadian populations. Because relatively small
numbers of Sharp-tailed Snakes have been found in only a few locations in
BC, in one of the most densely populated areas of the province, they are
at risk of extinction in Canada. They have been placed on the BC Red List,
and have been listed as Endangered by the Committee on the Status of
Endangered Wildlife in Canada. A recovery team has recently been formed to
develop a recovery strategy for Sharp-tailed Snakes in BC. Planned
recovery activities will focus on landowner stewardship and gathering more
information on population size and distribution.
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The Prince Edward Island Frogwatch Program
Rosemary Curley1, Rosalyn Sellick1 and Donna
Martin2
1Prince Edward Island Department of Fisheries
Aquaculture and Environment, PO Box 2000, Charlottetown, PEI C1A 7N8
2 Holland College, 425 Granville Street,
Summerside, PEI C1N 3C4
Prince Edward Island: Frogwatch (http://www.gov.pe.ca/frogwatch/index.php3)
is a collaborative effort between the Environment Canada EMAN network and
the PEI Provincial Government website with promotional input from the
Canadian Nature Federation (CNF). The basic premise is that amphibians are
good indicators of environmental health, it is easy to learn the calls of
frogs and toads, and therefore the general public can make a contribution
to ecological monitoring by participating in this program. The CNF made a
big effort in the spring of 2000 to promote this program and others like
it in each of the Provinces. In Prince Edward Island, the Frogwatch web
site was not constructed until late spring 2000, so a second effort to
promote the program was undertaken in 2001 by the authors. The CNF
Frogwatch poster was mailed to each of the schools in the Province,
accompanied by a letter from the Minister responsible for the environment
which invited schools to book a demonstration session. After overcoming
some problems , we were able to speak to over about 750 students at 10
schools, and to stimulate the interest of Science programmers within the
school system. Currently 135 persons are registered with PEI Frogwatch.
Results may be viewed by logging on to the website.
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Characteristics, movements, and health of a
Western Chorus Frog (Pseudacris triseriata) population at a
breeding pond in southwestern Qu�bec.
Jean-Fran�ois Desroches1 and Martin Ouellet2
1 8940 avenue Pradier, Charlesbourg, Qu�bec
G1G 5S5
2 Redpath Museum, McGill University, 859
Sherbrooke St. West, Montr�al, Qu�bec H3A 2K6
We studied a population of Western Chorus Frogs (Pseudacris
triseriata) at a breeding pond in southwestern Qu�bec. A total of 951
captures of 842 adults was made between 19 April and 28 May 2001, using a
225 meter-long drift fence surrounding the pond. Frogs were measured,
weighed, examined for diseases and deformities, marked, and released. The
majority of individuals (97.1% or 540/556) arrived from day 0 to 7, with a
peak (57.9% or 322/556) at day 3. Almost all frogs (99.5% or 393/395) left
the pond from day 15 to 39, with a peak on day 15 (44.1% or 174/395). The
sex-ratio was biased in favor of males (489 males: 353 females). For males
(N=54) and females (N=49) that were recaptured, the mean
duration in the breeding pond was 24.2�10.3 days and 20.2�9.7 days,
respectively. Including frogs caught after the breeding season, a total of
864 adults was examined (499 males and 365 females). Females were slightly
larger (SVL=25.48�0.08mm, N=365; weight=1.08�0.02g, N=197)
than males (SVL=24.66�0.07mm, N=498; weight=0.95�0.01g, N=253).
The tibia length was correlated with the SVL for both sexes (r2=0.711,
N=503, p< 0.001). Overall, 54 (6.3%)
presented body scars or traumatic digit amputations and 22 (2.5%) had
minor anomalies such as brachymely, syndactyly, or eye color variant
(black eyes). Chytridiomycosis was diagnosed in 54 of 142 (38.0%) adult P.
triseriata sampled during the breeding period. Chytrid infection is
enzootic in this apparently healthy population and has not yet been
associated to any cases of disease or mortality.
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Demographics of yellow-spotted salamanders (Ambystoma
maculatum) in relation to agricultural land use in Nova Scotia
Samara T. Eaton1 and Neil M. Burgess2
1 Biology Department, Acadia
University, Wolfville, NS B0P 1X0
2 Canadian Wildlife Service, Environment Canada, 6 Bruce St., Mt.
Pearl, NF A1N 4T3
We investigated the sex ratios, age structures and
snout-vent lengths (SVL) of yellow-spotted salamander populations breeding
in eight ponds in an agricultural area of Nova Scotia (Annapolis Valley).
Salamanders were live-trapped in spring 1997 as they approached breeding
ponds, using drift fences and side-flap pail-traps. Animals were sexed,
measured, and a toe was collected for aging purposes. Of 835 salamanders
captured, age was determined for 183 using skeletochronology. For all
salamanders from all ponds, the sex ratio was highly skewed in favour of
males (220 females/615 males) and breeding females had longer average SVL
than males (mean +/- SD: 88.1 +/- 6.3 mm, 76.2 +/- 5.9 mm, respectively).
For aged salamanders, the median age of breeding females (5 years, range:
1 - 9) was greater than males (4 years, range: 1 - 14). Land use within
100 m of each pond was determined for the previous nine years. The
agricultural intensity around each pond was ranked based on pesticide use
patterns for the different crop types present. A mean agricultural
intensity score was determined for each pond, and ponds were grouped into
4 low-agricultural-intensity ponds and 4 high-intensity ponds. There was a
significant difference in sex ratios between the four
high-agricultural-intensity ponds and the four low-intensity-ponds, with
high-intensity ponds having a higher proportion of females (34%) than in
the low-intensity ponds (23%). Male salamanders were significantly younger
in high-intensity ponds than in low-intensity ponds; a similar trend in
female ages was not significant. Salamanders in high-intensity ponds had
longer SVL than those in low-intensity ponds; the difference was larger
for females than males. SVL of all male salamanders increased with age,
and males in high-intensity ponds were longer than males of the same age
from low-intensity ponds. Breeding female SVL did not increase with age.
It is not possible to conclude from this study if agricultural land use
was the direct cause of the differences observed. Pesticide use could be
more toxic to smaller salamanders. However, this is only one of the
possible mechanisms through which agricultural land use could account for
the differences observed in age structures, body sizes and sex ratios.
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Methods for the Induction of Breeding in the
Northern Leopard Frog, Rana pipiens
A.N. Edginton1, S.Truant1 (presenting), H.J.
Boermans2, G.R. Stephenson1 and D.G. Thompson1
1 Department of Environmental Biology,
University of Guelph, Guelph, Ontario
2 Department of Biomedical Science, University
of Guelph, Guelph, Ontario
The development of a laboratory breeding program for Rana
pipiens would decrease the reliance of researchers on natural
populations and seasonal work. There are currently two methods for the
induction of breeding in Rana pipiens. The first method, Rugh
(1962), involves artificial fertilization using injected pituitaries, egg
stripping from the female and the removal of testes in the male. The
second method, Savage (1999), involves unnatural hibernation, the
injection of leutinizing hormone-releasing hormone followed by
fertilization through amplexus or unnatural fertilization following the
Rugh (1962) method. To test the effectiveness of the Savage (1999) method,
we used 13 males and 15 females over a year and a half. During unnatural
hibernation, there was high death among the males but only 20% death in
the females. Eggs were produced by 50% of the surviving females but only
three pairs successfully amplexed and produced fertilized clutches. In an
attempt to increase the efficiency of egg production and fertilization
another method was employed. This method used a temperature and
photoperiod regime in the hibernation quarters to simulate conditions in
the field. No males were hibernated but were still actively calling when
injected. All females survived hibernation and 80% (4/5) of the females
laid eggs using this method with a 20% fertilization rate. This method is
currently being repeated to determine its rate of success.
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Abundance and distribution of amphibians in selected
aquatic habitats of Prince Edward Island
Sarah A. Field and Kevin Teather
Department of Biology, University of Prince Edward Island, Charlottetown,
PE C1A 4P3
No comprehensive surveys of amphibian populations of
Prince Edward Island have been conducted since 1981. The objectives of
this study were to determine if the abundance and distribution of
amphibians were correlated with specific pond characteristics and to
compare the effectiveness of five methods in assessing species abundance
and distribution. We sampled 18 ponds, 13 inside PEINP and five in regions
outside the park across PEI during the breeding season of 2000. Seven of
the nine amphibian species found on PEI were detected at these sites.
Species richness was negatively correlated with both water temperature and
conductivity. Auditory surveys were the most efficient method of
monitoring anuran presence in aquatic habitats while visual surveys were
the most effective method of monitoring urodele presence in aquatic
habitats. While this study provided information on general abundance and
distribution of amphibian populations on Prince Edward Island, studies
should be continued in order to determine if amphibian populations on PEI
are stable.
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The developing frog hypothalamus as a sensor for
estrogenic EDCs
Natacha Gallant, David Lean and Vance Trudeau
University of Ottawa, Department of Biology and Centre for Advanced
Research in Environmental Genomics (CAREG), Ottawa, Ontario K1N 6N5
The recent decline of worldwide amphibian populations
has been attributed to various biotic and abiotic factors. Habitat
fragmentation, ultraviolet radiation, disease and toxic chemicals all have
the potential to impact on the aquatic environment, making it difficult to
discern a cause and effect relationship behind amphibian declines. The
influence of toxic chemicals on amphibian biology can often result in
outright mortality, repressed reproductive ability or deformities. One
particular group of substances, endocrine disrupting chemicals (EDCs), can
upset delicate hormonal interactions that control growth and reproduction.
Exposure to EDCs can be especially detrimental during development since
the hypothalamo-pituitary axis and hormonal pathways controlling
metamorphosis begin to form during the early larval stages and continue to
change through to adulthood. Examining the changes in gene expression of
the developing hypothalamus may provide clues regarding the target
pathways and mechanisms of action of a particular chemical or hormone, for
example estrogenic pollutants. A correlation between changes in
hypothalamic function as measured through multiple gene expression
profiles and a disruption in metamorphosis would provide a powerful and
novel diagnostic tool for detecting EDCs. We propose to use this
multilevel approach to study developmental changes in sensitivity of
leopard frog tadpoles to estrogenic chemicals.
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Differences
in Size, Pigmentation and Fluctuating Asymmetry in Stressed and
Nonstressed Northern Leopard Frogs (Rana pipiens)
Natacha Gallant1 and Kevin Teather2
1 University of Ottawa, Department of Biology
and Centre for Advanced Research in Environmental Genomics (CAREG),
Ottawa, Ontario K1N 6N5
2 Department of Biology, University of Prince
Edward Island, Charlottetown, PEI C1A 4P3
We compared a range of anatomical features of northern
leopard frogs (Rana pipiens) collected from areas where deformity
rates were low (~2% - nonstressed regions) and high (~40% - stressed
regions) to determine if one or more of these characters might be useful
in detecting developmental stress. Deformed individuals from stressed
regions were significantly lighter than normal frogs from the same area
and from nonstressed regions. Body length, head width, femur length, and
forelimb length were also significantly shorter in deformed and normal
individuals from the stressed region than in individuals from nonstressed
regions. Despite being smaller, deformed individuals had significantly
larger pigment spots. Fluctuating asymmetry in femur length, femur spot
area, femur spot number, and tibio-fibula length was significantly greater
in deformed frogs than in normal frogs from the stressed population and
the nonstressed group. Of these, however, only femur spot number provided
a data set suitable for fluctuating asymmetry analysis (R-L values have a
normal distribution, no directional asymmetry, no size-dependent
asymmetry). There were no significant differences found among the three
groups for fluctuating asymmetry in forelimb length, eyespot area, lateral
spot number, and lateral spot area.
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Reptile
health and disease: a Canadian perspective
Patrick Galois1 and Martin Ouellet2
1 Soci�t� d�Histoire Naturelle de la
Vall�e du St-Laurent, 21 125 Ch. Ste-Marie, Ste-Anne-de-Bellevue, Qu�bec
H9X 3Y7
2 Redpath Museum, McGill University, 859
Sherbrooke St. West, Montr�al, Qu�bec H3A 2K6
Diseases are becoming an important issue in reptile
population declines and they have been incriminated worldwide in some
dramatic epidemic events. Emerging infectious diseases are also of
concern, some having been associated with the introduction or
translocation of species. Unfortunately, information on diseases in wild
reptile populations is rather limited. We have reviewed the existing
international literature, which includes 79 published reports on
abnormalities, diseases, and mortalities in Canadian reptile populations.
The Canadian accounts include 15 snake and 9 turtle species; no health
information was found for any of the 6 native lizard species occurring in
Canada. Information was fragmentary and consisted mostly of reports of
endoparasitism, color mutations and variations, and road mortality events.
Extremely little information was available on the prevalence of infectious
agents and their impact at the population level. Considering the
precarious status of most Canadian reptile species, there is an urgent
need for baseline information on their health status in order to establish
sound conservation programs. Such information would allow improved
population management of reptile species by diminishing the risk of
disease propagation in vulnerable populations.
Sant� et maladies chez les reptiles: une perspective
canadienne.
Les maladies deviennent une pr�occupation majeure dans le d�clin des
populations de reptiles. Elles ont �t� incrimin�es dans des cas d��pid�mies
s�v�res � travers le monde. Les maladies infectieuses �mergentes sont
�galement pr�occupantes, certaines ayant �t� associ�es � l�introduction
ou � la relocalisation de certaines esp�ces. Malheureusement, l�information
disponible sur les maladies des populations naturelles de reptiles est
plut�t limit�e. Nous avons pass� en revue la litt�rature
internationale qui inclut 79 rapports publi�s sur des anomalies, maladies
et mortalit�s dans des populations de reptiles au Canada. Les donn�es
canadiennes concernaient 15 esp�ces de serpents et 9 de tortues. Aucune
information n�a �t� trouv�e sur la sant� des 6 esp�ces natives de
l�zards pr�sentes au Canada. L�information rassembl�e �tait fragmentaire
et comprenait principalement des rapports sur des parasites internes, des
mutations et variations pigmentaires, et des cas de mortalit� routi�re.
Tr�s peu d�information �tait disponible sur la pr�valence d�agents
infectieux et de leurs impacts au niveau des populations. Consid�rant la
situation pr�caire de la plupart des esp�ces de reptiles au Canada, il y
a un besoin urgent de donn�es de base sur leur sant� afin de mettre en
place des programmes de conservation judicieux. Ces informations nous
permettront d�am�liorer la gestion des populations de reptiles en
diminuant le risque de propagation de maladies dans des populations
vuln�rables.
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The Wood Turtle, Clemmys insculpta, at River
Denys: A second population for Cape Breton Island, Nova Scotia
Andreas Gr�f1 and John Gilhen2
1 Gustav-Heinemann-Ring 14, 63128 Dietzenbach,
Germany
2 Nova Scotia Museum of Natural History, 1747
Summer Street, Halifax, NS B3H 3A6
The Wood Turtle, Clemmys insculpta, population at
River Denys, Inverness County, Cape Breton Island, Nova Scotia, was
unknown to science until the summer of 1999. Andreas Gr�f photographed a
hatchling at McLennan Brook on 17 September 1999, and three adult males
between 14 and 19 September 2000. John Gilhen photographed two adult
females at South Side
River Denys on 18 June 2001. He also located a predator
excavated nest and empty egg shells on a stony-gravel bank at the outflow
of McLennan Brook and found one sub-adult male at the edge of a hay field
on 19 August 2001. These observations, as well as one nesting site and
five basking sites identified by Stephen M. Sober along the main branch of
River Denys, confirm a natural breeding population of Wood Turtles exists
in the River Denys Watershed.
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The
species richness, abundance, and diversity of amphibians in terrestrial
habitat fragments of Prince Edward Island
Leslie A. Hartling and Marina Silva
Department of Biology, University of Prince Edward Island, Charlottetown,
PE C1A 4P3
Habitat fragmentation often has negative effects on the
abundance and diversity of wildlife species. The abiotic and biotic
characteristics of a habitat also affect the ecology of the species
residing within a habitat. In this study, I investigated the relationships
between the species richness, abundance, and diversity of amphibians with
physical, abiotic, and biotic factors characterising specific sites.
Another goal of this study was to provide information concerning the
current status of amphibian species inhabiting terrestrial habitats on
Prince Edward Island, as research concerning this taxa is scarce in this
province. Eleven sites located in the central region of Prince Edward
Island were sampled from May 1st to August 15th 2000, and in five of these
sites sampling was extended until September 30th. Drift-fence/pitfall
arrays were used to sample amphibians. Cover boards and time-constrained
searches were also used with the intention of providing additional
information on urodeles, in particular red-backed salamanders. The
drift-fence/pitfall arrays were found to be the most efficient sampling
technique. Although all nine amphibian species known to occur on Prince
Edward Island were sampled, the maximum species richness per site was
seven. Amphibian abundance was found to be correlated with fragment
perimeter, and species richness was negatively correlated with pond area.
Amphibians occurred more often than expected in areas with canopy. My
results on the population status of amphibian species generally confirmed
the findings of previous studies.
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Nested
herpetofaunal assemblages on islands: lessons for conservation
Stephen J. Hecnar1, Gary S. Casper2, Ronald W.
Russell3, Darlene R. Hecnar1 and Jeffrey N. Robinson1
1 Dept. of Biology, Lakehead University, 955
Oliver Road, Thunder Bay, Ontario P7B 5E1
2 Section of Vertebrate Zoology, Milwaukee
Public Museum, Milwaukee, WI 53233
3 Dept. of Biology, Saint Mary�s University,
923 Robie St., Halifax, NS B3H 3C3
For centuries, studies of islands have taught us much
about biology and they continue to enlighten us. Amphibians and reptiles
of the Laurentian Great Lakes form a widely distributed and highly
overlapping diverse assemblage of species. Islands in the Great Lakes
differ in aspects of their geography, geology and climate, but share a
common post-glacial history. Our goal was to document and explain the
patterns of nestedness across a variety of spatial and taxonomic scales.
We studied amphibian and reptile assemblages (47 species) occurring on 107
landbridge islands among four archipelagoes (Lake Erie, St. Lawrence,
Georgian Bay, Apostle) in the Great Lakes. We constructed presence-absence
matrices from four recent surveys and quantified nestedness using the
temperature (T), departures (% PN), and Wilcoxon methods.
Islands supported diverse assemblages resembling mainland source pools and
were significantly nested across the entire basin, all archipelagoes, and
all taxa, but did not differ among archipelagoes. The degree of nestedness
differed (most to least) among classes (reptiles, amphibians), orders
(snakes, turtles, frogs, salamanders) and species. Nestedness and species
richness were strongly associated with area but not isolation. The
similarity of insular and mainland faunas indicate that the entire basin
shares virtually the same species pool. Differences in nestedness among
taxa appear to be related to differences in basic biology, natural
history, and ecology. Our results suggest that preserving large islands
instead of equivalent areas of small islands would be a more effective
conservation strategy and results of island studies may be applicable
elsewhere in the Great Lakes basin.
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Reptilian
conservation can brush against, but cannot afford to shake hands with
uncertainty: Reasons why long-term life history research must precede
wildlife conservation efforts for long-lived reptiles in Canada
W. Hollett, J. Congdon and R. Brooks (presenting)
Department of Zoology, University of Guelph, Guelph, Ontario N1G 2W1
The management of wildlife for conservation can be
generally described as "human efforts to maintain wild
creatures". Conservation is challenged to understand and maintain the
preexisting infrastructure (biology and ecology) that is vital to the
persistence of wild creatures. The relatively long lives and somewhat
unique life-histories of many reptiles describe the foundation of the
natural infrastructure that should guide reptilian conservation efforts.
However long-term life-history research of reptiles is rather scarce. What
are the costs and benefits of long-term research to conservation in
general and why might the benefits of long-term research outweigh the
costs for reptilian conservation efforts.
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Estimating
northern limits in Canadian turtles: a method to estimate historical and
potential distribution?
Sarah M. Holt, Sarah Primeau and Ronald J. Brooks
Department of Zoology, University of Guelph, Guelph, Ontario N1G 2W1
Development rate of embryos in many turtle species is
positively correlated with incubation temperature. We developed a growth
model that shows that developmental stage, s, is largely a function
of accumulated heat units within a nest, u(t), and time
since oviposition, t (s=k0 + kuu(t)
+ ktt). The model uses developmentally staged snapping
turtle (Chelydra serpentina) and painted turtle (Chrysemys picta)
embryos collected from Algonquin Park, Ontario. The growth model explains
87.1% of the variation in developmental stage for snapping turtles (n=129,
p<0.0001) and 82.3% (n=102, p<0.0001) in painted turtles. A growth
model can be used to determine the developmental factors limiting species�
distribution. We tested the hypothesis that the distribution of turtles in
Ontario is limited by incubation temperature in all Canadian turtle
species. We predicted that the northern limits are dependent on the
average amount of heat available over the growing season. Predicted and
actual range limits were similar. This preliminary study suggests that
with better data on development times and environmental temperatures we
could provide useful guidelines for future conservation and restoration of
reptile populations.
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New insights into the biology of leatherback
turtles (Dermochelys coriacea) in the Northwest Atlantic
Michael C. James
Department of Biology Dalhousie University Halifax, Nova Scotia Canada B3H
4J1
The leatherback turtle (Dermochelys coriacea) is
a giant marine reptile with an impressive geographic range. While the most
northerly nesting beaches for leatherbacks in the Atlantic are found along
the coast of Florida, these turtles spend much of their time at higher
latitudes, including waters off Atlantic Canada. The leatherback is
considered critically endangered globally (IUCN, 2000) and endangered in
Canada (COSEWIC, 2001). Since 1998, a program in Nova Scotia has involved
commercial fishers in marine turtle research and conservation initiatives.
This work has yielded new information on the biology of leatherback
turtles in the northern part of their range, including an improved
understanding of local and long-distance movements. This research has also
necessitated a reconsideration of the importance of Canadian waters to
this species.
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Marine
Turtles and the Canadian Atlantic pelagic fishery: a previously
unrecognized potential source of sea turtle mortality
Donald F. McAlpine
Natural Science Department, New Brunswick Museum, 277 Douglas Avenue,
Saint John, NB E2K 1E5
Three species of marine turtles occur in Canadian east
coast waters; the loggerhead, Caretta caretta, Kemp's ridley, Lepidochelys
kempii, and the leatherback, Dermochelys coriacea. Until
relatively recently, marine turtles in Canadian waters were often
considered extralimital wanderers. However, it is now clear Canadian
waters and nearby areas outside the 200 mile limit provide important
seasonal habitat for significant numbers of loggerehead and leatherback
turtles. Preliminary information also suggests that in some years
significant numbers of leatherbacks and juvenile loggerheads are being
taken incidentally by Canadian and foreign longliners, operating both
inside and outside the Canadian 200 mile limit. Here I review new
information on sea turtle distribution in relation to the Canadian
Atlantic pelagic fishery, consider the results of a recent meeting on sea
turtle by-catch in the Canadian Atlantic fisheries, and suggest that
conservation of sea turtles in Canadian waters could be enhanced through
Canadian participation in the recently ratified Inter-American Convention
for the Protection and Conservation of Sea Turtles.
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Amphibian
species richness and distribution in northwestern Ontario: is hydroperiod
important?
Jeffrey N. Robinson, Felix Eigenbrod and Stephen J. Hecnar
Department of Biology, Lakehead University, 955 Oliver
Road, Thunder Bay, ON P7B 5E1
Understanding amphibian distribution is of fundamental
importance if we wish to prevent the decline of species. Amphibians are
often categorized as either �temporary� or �permanent� pond
species where the major respective stresses are desiccation and predation.
Because these processes are opposing, species richness should be greatest
in �semi-permanent� sites. A hypothesized cause of amphibian decline
is climate change and drought. Under this scenario, species richness would
be expected to be greatest at permanent sites, which may act as �sources�.
Do certain types of breeding areas support more species than others? Are
certain species more common in one type of breeding area than another? Our
goal was to answer these questions by investigating amphibian species
richness and distribution in different water body types in the Boreal
forest in Northwestern Ontario. We surveyed 32 temporary, 30
semi-permanent and 31 permanent water bodies to determine which amphibian
species were present. We found that the average species richness of the
temporary sites was significantly lower than both semi-permanent and
permanent sites, but species richness did not differ between
semi-permanent and permanent sites. However, certain species are more
common in one type of site than others. For example, Rana clamitans
occurred at 81% of permanent, 20% of semi-permanent and 0% of temporary
sites. Whereas Pseudacris triseriata occurred at 60% of
semi-permanent, 50% of temporary, but only 3% of permanent sites. On the
other hand, Pseudacris crucifer was nearly ubiquitous, while Rana
pipiens, Notophthalmus viridescens and Ambystoma laterale were rare at
all site types. Our results suggest that the traditional desiccation/
predation stress model is not supported in boreal amphibian assemblages.
However, for conservation of individual species it is important to
identify site characteristics that affect survival of populations.
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Species
totemization in herpetological conservation
Frederick W. Schueler
Eastern Ontario Biodiversity Museum, P.O. Box 1860, Kemptville, ON K0G 1J0
The reporting of scientific research downplays the
emotional content of the subjects studied, but once we begin to use
scientific results to try to change other people's behaviour, we've got to
both acknowledge our emotional involvement with our subjects, and then try
to use that involvement to try to evoke an echo of our commitment to our
beasts among those who would otherwise kill or ignore them or degrade
their habitat. I suggest that it may clarify our thinking and educational
activities to compare the empathy of the specialist with the creature
studied, with the �totem' concept of shamanic cultures. I will discuss
three sorts of herpetological totems:
Personal totems are those
species we've worked most intensely with and understand most clearly, so
that we feel compelled to know everything that is done with them, and
eventually become, in an inversion of the old shamanic relationship, the
species' protector and advocate against human ignorance and destruction.
In an era when children often have severely restricted exposure to wild
herps, one goal of education must be to facilitate the totemic experiences
that will make naturalists of previously TV-bound youngsters.
Conceptual totems: We need to
identify the ecological and evolutionary lessons that are most clearly
taught by particular species, and push these in educational programmes as
emblems or totems of these processes - Leopard Frogs represent
landscape-wide habitat connections, Jefferson's complex Ambystoma
represent species-level complexity, Green Snakes represent cryptic
coloration, and Rattle Snakes represent dependence on limited hibernacula
- but this has to closely follow the most recent research to keep from
becoming repetitious and silly.
Locality (including seasonal) totems:
may be either regional totems - especially characteristic and vulnerable
species that characterise a whole region, as neotenic Ambystoma
tigrinum do for the Okanagan, or species that use particular sites in
particular seasons, like winter Mudpuppies below the dam at Oxford Mills.
In Canada many of our populations persist only because of peculiar
juxtapositions of habitat patches, and much of our conservation effort
goes into raising public awareness of what goes on at particular sites:
road crossings, breeding congresses, foraging areas, and hiberncaula, and
protecting these from wanton or unwitting destruction. There's plenty of
room for improving our own understanding of the environmental triggers of
seasonal activity, and in the course of doing so, communicating the
possibility and joy of observing these activities to narrowly focused,
bird-&-flower-struck naturalists and the non-naturalist public.
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Pseudacris
triseriata on the Five-Mile Block (Tobermory, Bruce County, Ontario):
1984-2001
Frederick W. Schueler
Eastern Ontario Biodiversity Museum, Box1860, Kemptville, ON K0G 1J0
Despite a scattering of records from the 1970's, and
George Toner's 1963 assertion that P. triseriata, the Striped Chorus Frog,
was the most abundant amphibian on the Bruce Peninsula, on the outer Bruce
Peninsula in the 1980's and 1990's this species seems to have been
confined to a small area southeast of Tobermory, the 'Five-Mile Block.'
This is the only place on the outer peninsula where the concession system
is completed as a closed block of roads, and much of the area was farmed
in the first half of the 20th century. My surveys in 1984, 1990, and 1992
found the species throughout the block, but in 1997 I heard only 3
choruses, and in a detailed survey in 1999 John Francis heard only a
single doubtful call. In 2001 a survey of all the sites where the species
had been heard did not find any. This may be exemplary of the general
decline of Chorus Frogs in southern Ontario and the St Lawrence Valley: a
general lowering of water levels by building-up and gravel extraction,
coupled with secondary succession and successive dry years, seems the most
likely explanation for the extinction of this population.
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The Western
Chorus Frog � declining but not at risk?
David C. Seburn1, Carolyn N.L. Seburn1 and Brian
Craig2
1 Seburn Ecological Services, 920 Mussell
Road, RR#1 Oxford Mills, ON K0G 1S0
2 Ecological Monitoring and Assessment Network
Coordinating Office, Environment Canada, Canada Centre for Inland Waters,
867 Lakeshore Road, Burlington, ON L7R 4A6
The Western Chorus Frog (Pseudacris triseriata)
has recently been designated Not at Risk by COSEWIC, despite having
declined significantly in Quebec. Although it is widespread in Ontario, we
provide strong circumstantial evidence of declines. We analyzed the status
of the Chorus Frog using volunteer monitoring data. Over 5000 records were
obtained, spanning the period 1858-2000. Chorus Frogs were reported from
30 UTM grid blocks (100 x 100 km) and 780 grid squares (10 x 10 km). Only
31% of squares have records from the last five years. We used Spring
Peeper data to control for the possibility that lack of recent records may
indicate a lack of observers not a genuine decline. On that basis, an
average of 10% (range: 0-50%) of squares per block have potential
absences. Four out of five of the blocks (17MT, MU,MV,MA) with the highest
ratio of potential absences are contiguous, stretching along the eastern
shore of Lake Huron.
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Do we need
a National amphibian and reptile database?
Carolyn N.L. Seburn1, David C. Seburn1, Christine
Bishop2, and Brian Craig3
1 Seburn Ecological Services, 920 Mussell
Road, RR#1 Oxford Mills, Ontario Canada, K0G 1S0, [email protected]
2 CARCNet, 4553-46B St, Delta, British
Columbia, V4K 2N2, [email protected]
3 Ecological Monitoring and Assessment Network
Coordinating Office, Environment Canada, Canada Centre for Inland Waters,
867 Lakeshore Road, Burlington, Ontario, Canada, L7R 4A6, [email protected]
We conducted a survey of amphibian monitoring and atlas projects to assess
the potential for a national approach to compiling and/or analyzing
amphibian occurrence data. Thirty-three programmes were surveyed and
twenty have responded to date. The oldest atlas programme (Ontario) is 18
years. The modal age of volunteer monitoring programmes is 1 year (max.
9). Although all provinces and territories have at least one monitoring
programme (FrogWatch), three of the four longest running ones are based in
Ontario. For this reason it was deemed premature to start national
analysis of trend data. Only four provinces have atlas programmes although
several others are compiling some atlas type data. Most respondents were
interested in participating in some type of national project and urged
that it include reptiles. We therefore propose that CARCNet undertake a
National Historical Data Compilation Project. The goal of such a project
would be to compile geographically referenced, historic records of all
amphibians and reptiles in Canada up to and including the year 2000.
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Red-sided garter snake (Thamnophis sirtalis
parietalis) relocation and education project
Lisa Takats
Alberta Conservation Association, 7th floor, O.S. Longman
Building, 6909-116 Street, Edmonton, Alberta T6H 4P2
In 1998, a red-sided garter snake (Thamnophis
sirtalis parietalis) relocation project was initiated in the Stony
Plain area, west of Edmonton. The goal of the study was to determine
whether snakes would overwinter when relocated from one hibernaculum to
another. A total of 1190 garter snakes were captured and relocated to a
den 6 miles away that contains about 8 700 snakes (located in an old
gravel pit). All captured snakes were scale-clipped, measured and weighed,
and all snakes > 45 cm snout-vent length were PIT (Passive
Integrated Transponder) tagged. Thirty percent of the relocated snakes
returned to the new den the following year. Marked snakes from the gravel
pit den showed a 32% return rate. None of the relocated snakes returned
to, and no new snakes were observed at, their previous den site at the
completion of the project (spring 2001). Data analyzed showed the new den
to contain a normal distribution of sizes, with the 41-50 cm size class
having the highest number of snakes. Relocated adult female snakes also
showed evidence of breeding (cloacal plugs). Overall the project was very
successful, and showed that snakes can be relocated successfully to
another occupied den. Education projects included talks, posters, field
trips, media releases, and another snake den management program (in Fort
Assiniboine, Alberta). A Snakes of Alberta poster was released and will
also increase public knowledge about snakes and their ecology.
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Current
status of the Nova Scotia Herpetofaunal Atlas
Sabrina Taylor
Nova Scotia Herpetofaunal Atlas Project, Acadia University Wolfville, NS
B0P 1X0
The Nova Scotia Herpetofaunal Atlas is a 5 year project
that was initiated to assess the distribution and abundance of reptiles
and amphibians through the efforts of volunteers. The volunteers are now
in their third year of data collection and have submitted a total of 2684
records in 343 map squares across Nova Scotia. Submissions have increased
each year, starting with 340 records in 1999 and growing in number to 1119
in 2000, and 1225 in 2001. I will discuss the project�s methodology,
present the results so far, and discuss the probability of meeting project
goals. Our web site is http://landscape.acadiau.ca/herpatlas/
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Growth
rates and deformities of green frogs and leopard frogs from areas
differing in agricultural intensity on Prince Edward Island
Kevin Teather1, Neil Burgess2 and Natacha Gallant3
1 Department of Biology, University of Prince
Edward Island, Charlottetown, PEI C1A 4P3
2 Canadian Wildlife Service, Environment
Canada, 6 Bruce St., Mt. Pearl, NF A1N 4T3
3 University of Ottawa, Department of Biology
and Centre for Advanced Research in Environmental Genomics (CAREG),
Ottawa, ON K1N 6N5
In Prince Edward Island, approximately 50% of the land
is devoted to agricultural production. The most important crop, potatoes,
requires repeated (often 10-15) applications of pesticides throughout the
summer and fall. If amphibians are particularly sensitive to such
chemicals, then we would predict differences in growth rates and / or
deformity rates in areas of high and low agricultural intensity. We
present the preliminary results of a three year study examining the
potential relationship between amphibian health and land use patterns on
PEI. There is limited evidence suggesting that agriculture may be
affecting the growth and development of green and leopard frogs.
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Multiple
stressor effects on native amphibians
D. Thompson1, B. Wojtaszek1,2, C. Chen3,
A. Edginton2, H. Boermans2 and G. Stephenson2
1 Great Lakes Forestry Centre, Canadian
Forestry Service, Sault Ste. Marie, Ontario
2 Department of Environmental Biology,
University of Guelph, Guelph, Ontario
3 Department of Biological Sciences, Dartmouth
College, Hanover, New Hampshire
An overview of an ongoing collaborative project
examining effects of multiple stressors on native amphibians will be
presented. The research focuses on herbicide contamination, acidity and
food deprivation as potential concomitant and interactive stressors
relevant to amphibians in small Canadian forest wetland ecosystems.
Direct, indirect, interactive and sublethal effects have been examined
through four tiers of investigation ranging from highly controlled
laboratory toxicity tests, through field mesocosm studies to operational
monitoring. Tier I studies provide concentration-response data for two
herbicides of interest as well as comparative assessment of life-stage and
species sensitivity for Rana pipiens, Rana clamitans, Bufo americanus and
Xenopus laevis. Tier II experiments examine interactions between pH, food
deprivation and herbicide stressors for both zooplankton and most
sensitive life stages of amphibian larvae. Tier III studies involve
replicate mesocosms deployed in two different wetland systems to study
effects of the two herbicides on plankton population dynamics and caged
amphibian larvae under varying natural site conditions. Finally,
operational monitoring studies quantify the range of real-world exposure
concentrations resulting from aerial applications of herbicides to forest
regeneration sites where small wetlands may be over-sprayed, adjacent or
protected by vegetative buffers. Key findings from different tiers of
study and their value in risk assessment and protection of native
amphibian species will be discussed.
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Comparative
phylogeography of the Pacific Northwest: Community history as a guide to
conservation science
M.D. Thompson and A.P. Russell
The University of Calgary, Department of Biological Sciences, 2500
University Dr. NW, Calgary, Alberta T2N 1N4
Palaeoecological techniques, such as carbon dating and
pollen analyses, aid in reconstructing a time-indexed chronology of
ecology of the geologic past. Community formation can now be confidently
reconstructed by comparing palaeoecology with the modern geographic
overlay of species, genes and their frequencies. Syntheses of
palaeoecology and nested statistical geographic analysis of haplotype
phylogenies enable explicit tests of biogeographic hypotheses. Such
research falls under the discipline of phylogeography, which has
revolutionized conservation science and practices. A comparative overview
of phylogeographic research in the Pacific Northwest, with a focus on
unpublished research on long-toed salamanders, will be presented in the
context of conservation methodological debates. The Pacific Northwest
experienced a great recession of Pleistocene glaciers that opened a wave
of ecological succession mediated by geographic barriers and prescribing
northward dispersal corridors. Such corridors are readily reflected in
patterns of herpetofauna distribution as these organisms share
characteristic life histories that leave a historical genetic signature in
their place of residence. The Pacific Northwest has recently been the
focus of intensive study in this context. A comparative examination of
this research identifies the nature of historical community development
and prescribes the boundaries that were significant in this regard. The
explicit criteria to identify these boundaries are discussed, offering a
practical approach to the use of evolution as a guiding principle in
conservation management. Evolutionarily cognizant management regimes have
been developed including Evolutionary Significant Units (ESU�s), which
addresses genetic diversity, and frameworks that consider adaptive
diversity. A new approach, the historical recapitulatory methodology, will
be presented with suggestions that it serve as a new guiding principle of
conservation science and that it replace the endangered species concept.
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Hyla Park:
Lessons learned in the establishment of an amphibian conservation area in
a semi-urban setting
Don Vail1 and Donald F. McAlpine2
1 Nature Trust of New Brunswick, Inc.,404
Queen Street, Fredericton, NB E3B 5A6
2 Natural Science Department, New Brunswick
Museum 277 Douglas Avenue, Saint John, NB E2K 1E5
Hyla Park was established by the Nature Trust of New
Brunswick in 1995 to protect the most northeasterly North American
population of the gray treefrog, Hyla versicolor. The Nature Trust
manages the site under a long-term lease with the local municipality of
Fredericton. The site, consisting of about 9
hectares of wetland in south-cental New Brunswick was previously
threatened. It is probably the first conservation area in Canada
specifically set aside to protect an amphibian. The habitat at Hyla Park
is highly disturbed. Most ponds have formed in now heavily vegetated low
areas from which topsoil and gravel were removed in the past for
construction purposes. However, this history of previous activity at the
site has left a network of roads and trails that have proven useful to the
Trust in providing public access to the Park. With volunteer assistance,
considerable refuse has been removed from the site, a network of
interpretive tails and signage have been installed, and an educational
video about the site has been produced. The site is now used regularly by
local naturalists groups and school classes interested in wetland ecology,
and some scientific research has been carried out at the Park. While the
Park has provided more educational opportunities than anticipated, the
commitment demanded of volunteers to ensure the success and continuing
maintenance of the site has also proven greater than expected. Although
vandalism of signage and ATV traffic continue to be problems at Hyla Park,
some local residents have taken a protective interest in the gray treefrog
and threats to wetlands in the area generally.
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Painted
Turtles (Chrysemys picta) of Vermont: an examination of phenotypic
variation and intergradation
Katherine M. Wright and James S. Andrews
Department of Biology, Middlebury College, Middlebury, Vermont 05753
The Painted Turtle, Chrysemys picta Schneider
(family Emydidae), has been divided into four subspecies (with differing
morphological characteristics), two of which intergrade in the
Northeastern United States. The intergradation of C. p. marginata
(Midland Painted Turtle) and C. p. picta (Eastern Painted Turtle)
has been well studied in some areas, but has been poorly studied in
Vermont, an area that could contribute important information on this
species and the process of intergradation. Turtles were trapped and
released from three different watersheds in Vermont, and others were
examined from collections at the Carnegie Museum of Natural History from
within the center of the ranges of the two parent subspecies to
investigate the hypotheses that Vermont�s turtles are intergrades, and
that the amount of influence from each subspecies differs with drainage in
Vermont. For the external characteristics of scute disalignment, scute
border width, and plastral figure, many of Vermont�s turtles were
determined to be significantly different from typical C. p. marginata
and C. p. picta, and were intermediate to them, strongly suggesting
that they are intergrades. Samples from the southeast corner of the state
were determined to be C. p. picta.
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Poster Presentations
Analyses
of gross morphological deformities of the Common Snapping Turtle (Chelydra
serpentina serpentina) in Algonquin Provincial Park, Ontario
Nicole E. Browning, S.L. Ashpole and R.J. Brooks
Department of Zoology, University of Guelph, Guelph. Ontario N1G 2W1
Current literature on reptile deformities suggests that
a higher rate occurs at sites contaminated by various pollutants than in
those without. This leads to the assumption that contaminants are related
to the development of gross morphological deformities. Toxicological
studies involving the common snapping turtle (Chelydra serpentina
serpentina) in Southern Ontario typically use Algonquin Provincial
Park as a control site. It has been documented in the literature, that the
rates of hatchling deformities in turtles at this site are quite low (<
5%), representing a normal background level. However, a recent study
looking at hatchling deformity rates over a five year span indicated that
there is a high level of variation between years, anywhere between 6 and
31%. Toxicological studies have focused on hatchling deformity rates for
logistical convenience, however, it might be more meaningful to know the
adult population rate to interpret a more
accurate biological effect of contaminants. In this
study, we have determined the background adult snapping turtle deformity
rate in Algonquin Park, as well as examined the effect these deformities
have on the survivorship of the turtles. In addition, the potential for a
genetic cause of transmission of deformities between mothers and
hatchlings was investigated. This was accomplished by statistical analyses
of a comprehensive database collected over a thirty-five year period.
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The effects
of UV-B radiation and octylphenol (OP) on growth, metamorphosis and
survival in the northern leopard frog (Rana pipiens)
M. Croteau, N. Gallant, D.R.S. Lean and V.L. Trudeau
University of Ottawa, Department of Biology and Centre for Advanced
Research in Environmental Genomics (CAREG), Ottawa, Ontario K1N 6N5
Recent increases in UV-B radiation and the presence of
various estrogenic pollutants in the aquatic environment are considered as
contributing factors to the decline in amphibian populations observed
worldwide since the 1960s. It has been shown that exposure of developing
amphibians to ambient or enhanced levels of UV-B radiation induces
morphological deformities and reduces survivability. OP is a toxic
metabolite of alkylphenol polyethoxylate present in industrial effluents
and has demonstrated significant estrogenic activity in fish and mammals.
Our study examined the effects of short-term and long-term exposure of Rana
pipiens tadpoles to environmentally relevant levels of UV-B radiation
(7 and 14 mW/cm2) and OP (1ng/L and 1 mg/L), alone and in combination.
Tadpoles exposed to 1ng/L OP for 11 days immediately post-hatch resulted
in a significant reduction (p<0.05) in body weights at forelimb
emergence (Gosner Stage 42). In the long-term experiment, all tadpoles
exposed to UV-B radiation throughout the entire larval period had retarded
development and increased weight (p<0.05); metamorphosis in these
groups was never initiated. A high level of abnormalities has been
observed in treatments for both experiments, consisting mainly of
abdominal bloating and lordosis. The incidence of deformities observed in
exposed tadpoles was 2-7 fold higher than the control groups. A separate
study focused on the effect of early exposure to OP on amphibian growth
and survival. Newly hatched tadpoles exposed for 14-days to 0.25-0.75 mg/L
OP were significantly larger (p<0.05) than the vehicle�exposed
controls (0.01% EtOH). In a comparison between the toxicity of OP and
estradiol, exposure to 0.75 mg/L E2 after 14-days resulted in 70%
mortality whereas exposure to the same concentration of OP resulted in
100% mortality after 1 day. These results indicate that early exposure to
UV-B and/or OP can disrupt normal growth and development of R. pipiens tadpoles.
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Northern
leopard frog reintroduction project
Kris Kendell
Alberta Conservation Association, 7th Floor, O.S. Longman
Building, 6909-116 Street, Edmonton, Alberta T6H 4P2
The northern leopard frog (Rana pipiens) was once
a common and widespread amphibian found throughout central and southern
Alberta. During the late 1970s, the leopard frog experienced a dramatic
decline in distribution and numbers over much of its historic range in
Alberta. The leopard frog is designated as Threatened under Alberta�s
Wildlife Act and is listed by the Committee on the Status of Endangered
Wildlife in Canada (COSEWIC) as Special Concern in Alberta. Known
distribution data indicate the leopard frog is currently extirpated from
the upper head waters of the Red Deer River drainage and entirely absent
from the North Saskatchewan River drainage.
In 1998, the Alberta Fish and Wildlife Division began to
explore the feasibility of reintroducing leopard frogs into formerly
occupied habitats in the upper Red Deer River and North Saskatchewan River
drainage basins in Alberta. With little ability to naturally disperse back
into historic parts of its range, a pilot reintroduction project was
initiated in 1999 at the Raven Brood Trout Station near Caroline, Alberta.
The project involved the captive rearing of leopard frogs from egg stage
of development to metamorphosed frog, in two man-made outdoor ponds at the
trout station.
The primary objective of the project is to re-establish
leopard frogs in the headwaters of the Red Deer River and North
Saskatchewan River drainages, consequently allowing natural downstream
dispersal along these watersheds. Over a three year period more than 4500
young of the year leopard frogs have been released into historic habitat
in the upper headwaters of the Red Deer River near Caroline, Alberta. In
2001, 750 young frogs were released at a new pilot release site in the
upper headwaters of the North Saskatchewan River near Rocky Mountain
House, Alberta. All captive reared leopard frogs were marked using a
Visible Implant Elastomer (VIE) tagging system that allowed unique marking
schemes to be used to assess the success at each release site and monitor
the dispersal of released frogs.
On 19 June 2001, three leopard frogs that were released
in previous years were located within the study area near Caroline,
marking the first occurrence of leopard frogs in that area in nearly 50
years. At least 10 individual leopard frogs have been observed or captured
to date within the study area and calling activity was recorded. Evidence
of the overall success of the project, at the first release site, may be
realized in the spring of 2002 when previously released frogs that have
reached sexual maturity will have the opportunity to breed for the first
time.
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FROGWATCH
CANADA: Conservation & education with the Canadian Nature Federation
and the Ecological Monitoring and Assessment Network
Elizabeth A. Kilvert1 and Neala L. MacDonald2
1 EMAN Coordinating Office, CCIW, 867
Lakeshore Road, P.O. Box 5050, Burlington, Ontario L7R 4A6
2 CNF, 1 Nicholas Street, Suite 606, Ottawa,
Ontario K1N 7B7
Several different amphibian survey protocols are
currently accessible by North Americans through the Internet. However, the
key to valuable conservation efforts lies in the collection of reliable
monitoring data. CNF and EMAN have developed the Frogwatch Teachers'
Resource Guide to facilitate the involvement of non-scientists by
advocating amphibians as important indicator species. We believe that
public awareness of global environmental issues is enhanced when groups or
individuals make a commitment to engage in observing phenology in their
community. The Frogwatch program is intended to foster nature appreciation
among Canada's youth. By providing educators with tools such as lesson
plans and activities, carefully guided field trips, and access to current
scientific resources -- CNF and EMAN aim to forge a critical link between
backyard conservation and the role of science in a natural setting. In
collecting monitoring data on a national scale by a variety of local
programs and over a variable number of years comes the need to develop
national protocols. Given the magnitude of this situation we need to
initiate clear protocols on the monitoring, reporting and structuring of
data. If data systems are centralized and can cross query one another this
will help to insure that data is used to a maximum extent while minimizing
interpretation errors. This would systematically simplify the assessment
of anuran trends in regard to population size, diversity or as indicators
of ecosystem health.
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Amphibian
and Reptile Monitoring and Management in Alberta
Lisa Takats
Alberta Conservation Association, 7th floor, O.S. Longman Building,
6909-116 Street, Edmonton, Alberta T6H 4P2
Amphibians and reptiles have existed for about 400
million years, long before humans were a part of the landscape. They are
an important component of ecosystems and since they are environmentally
sensitive, declines in their populations may be indicators of problems in
the ecosystem. In Alberta, most of the long-term monitoring is conducted
through the Alberta Amphibian and Reptile Monitoring Program (cooperative
between Alberta Conservation Association and Alberta Sustainable Resource
Development). Projects include volunteer monitoring, RANA (Researching
Amphibian Numbers in Alberta), call surveys, snake den inventory,
monitoring, and management. Over 250 people are involved in the volunteer
monitoring program, and seven RANA sites are also being intensively
monitored throughout of the province (Beaverhill Lake, Cypress Hills,
Hinton, Kananaskis, Lesser Slave Lake, Meanook, and Saskatoon Island).
Information is being collected on distribution, abundance, trends, and
phenology of herpetiles. Management efforts include snake relocation, den
and wetland management, and information distribution. Educational
materials include Teacher�s Guides, herpetile posters, identification
manuals and amphibian call tapes.
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Comparative
assessment of techniques for sampling native salamanders inriparian zones
of boreal mixed wood forests: Proposed research
Shana Truant1, Dean Thompson2 and Gerald R.
Stephenson1
1 Department of Environmental Biology,
University of Guelph, Guelph, Ontario
2 Canadian Forestry Services, Sault Ste.
Marie, Ontario
Efficient standardized sampling techniques are essential
for providing consistent data on amphibian populations. A variety of
techniques (e.g. cover boards, drift fences, and pitfall traps) have been
used in previous salamander studies, however, direct comparative
assessments of these sampling techniques in terms of efficiency,
variability, influencing factors, logistics and costs are generally
lacking. Optimal techniques may vary with species, site and climatic
factors and to our knowledge no comparative information pertinent to
monitoring salamanders in boreal mixed-wood forests currently exists. This
project will comparatively assess selected techniques in relation to the
aforementioned criteria and will provide pre-treatment data for a
four-year study designed to investigate the effect of differential
harvesting in riparian zones on resident salamander populations. Potential
study sites in the Chapleau/Folyete region near Timmins and alternative
sites near White River Ontario are currently being evaluated. Species that
may be encountered along riparian zones in these areas include:
Blue-spotted salamander (Ambystoma laterale), Spotted salamander
(Ambystoma maculatum), Four-toed salamander (Hemidactylium scutatum),
Eastern newt (Notophthalmus viridescens) and Red-back salamander (Plethodon
cinereus). Four different sampling techniques have been selected for
comparison. Drift fences and pitfall traps will be set up near breeding
sites and will be used when appropriate weather conditions are met.
Artificial cover objects will be used, and both wood and paving stones
will be studied. Night encounter surveys will be conducted when weather is
ideal for sampling salamanders, and will involve sampling along transects.
Breeding site surveys will allow for examination of salamander communities
when salamanders are most conspicuous. Salamanders will be marked (for
mark/recapture studies) using a Visible Implant Fluorescent Elastomer
(VIE) tagging system. Electronic tracking to establish home range and
local migration patterns may also be attempted. It is the goal of this
study to increase knowledge regarding salamander populations in riparian
zones of boreal mixed-wood forests and to determine appropriate sampling
techniques for salamander species in northern Ontario. This study is
funded principally by the Ontario Living Legacy Trust and involves
collaboration among industry (Domtar Inc.), academia (University of Guelph)
and government (Canadian Forest Service) institutions.
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Indirect
and multiple stressor effects of glyphosate and triclopyr herbicides on
native larval amphibians (Rana pipiens and R. clamitans) in
two wetland ecosystems in northern Ontario, Canada
B.F. Wojtaszek12, D.G. Thompson1(presenting), D.T.
Chartrand1, T.M. Buscarini1 and G.R. Stephenson2
1 Canadian Forest Service, Great Lakes
Forestry Centre, Sault Ste. Marie, Ontario
2 Department of Environmental Biology,
University of Guelph, Guelph, Ontario
The effects of glyphosate (VISION) and triclopyr
(RELEASE) on larvae of Rana pipiens and R. clamitans were
investigated using in situ enclosures. Single application of either
herbicide spanned environmentally realistic concentrations and relevant
toxicological endpoints for selected aquatic biota.
At 96 hours post treatment, complete tadpole mortality was observed in all
VISION and RELEASE treatments exceeding expected environmental
concentrations in both wetland ecosystems. Mortality due to RELEASE was
higher for both species in the more acidic (pH ~ 6), eutrophic wetland. In
contrast, R. pipiens showed greater mortality due to VISION
treatment in the neutral (pH ~7), mesotrophic wetland. Recovery from the
sublethal effects of RELEASE was both site and species dependent. Tadpole
growth appeared to be suppressed in RELEASE treatment concentrations
exceeding 1.28 mg acid equivalent/L. Dissolved oxygen levels decreased
with increasing herbicide concentration in both wetland systems,
indicating impacts on the phytoplankton community in both systems. Results
to date indicate concentration-dependent lethal and sublethal effects,
differential species sensitivity and differential herbicide toxicity which
vary depending upon the wetland system. Tadpole response may result from
herbicide treatment via either direct or indirect mechanisms (e.g. anoxia,
food deprivation) and/or multiple stress interactions (e.g. pH x
herbicide).
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Photos
|
Annual Meeting 2001 Participants |
|
Field Trip Leaders - PEI October,
2001 |
|
Maritime Herpetologists, from
left: Francis Cook, John Gilhen, Don McAlpine, and Sherman
Bleakney |
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Award Recipients
A complete list of 2001 award recipients can be found on our Awards
page
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|