|
|
|
East Kootenay
Northern Leopard Frog Project
|
This project began
in June 1998 and 105 sites were surveyed in August and September
of 1998 and 1999. These
sites span an area from the Canada/U.S.A. border to north of Golden,
British Columbia. Visual
encounter surveys were used to locate amphibians and reptiles.
These are performed by walking along the shore of a pond,
usually just out of the water.
Amphibians or reptiles were seen basking or, more often,
as they jumped into the water.
A variety of data was collected for each site including the
species and number of amphibians and reptiles encountered.
| No Northern Leopard
Frogs were located in this survey.
Species encountered included Columbia
Spotted Frog (Rana luteiventris) (416 individuals
at 61 sites) |

|
 |
Western
Toad (Bufo boreas) (53 individuals at 13 sites),
Long-toed Salamander (Ambystoma macrodactylum) (24 individuals
at 4 sites) |
Pacific
Chorus Frog (Pseudacris regilla) (55 individuals
at 1 site), Common Garter Snake (Thamnophis sirtalis) (14
individuals at 9 sites), Western Terrestrial Garter Snake (Thamnophis
elegans) (5 individuals at 5 sites), and Painted Turtle (Chrysemys
picta) (37 individuals at 5 sites).
No amphibians or reptiles were detected at 23 of the sites
surveyed.
Several methods
were used to educate the public and solicit Northern Leopard Frog
sightings. An 11”x17”
colour poster was distributed asking the public to report sightings
of Northern Leopard Frogs.
The poster had a large photo of a Northern Leopard Frog and
smaller photos of more common amphibians for comparison along with
phone and email contact information.
One hundred ninety of these posters were distributed around
the Columbia Basin. Twenty-four
sightings were reported by phone or email.
Of these, 11 were visited to investigate further.
Community survey days were organized in Golden, Invermere and Cranbrook.
These involved going out to a local wetland with members
of local naturalist or environmental groups and the public to talk
about Northern Leopard Frogs, global amphibian declines and how
to search for and recognize Northern Leopard Frogs.
We then proceeded to survey a section of a wetland as a group.
A total of 26 people attended these events.
Public presentations were also made to a variety of audiences including
the Rocky Mountain Naturalists in Cranbrook, a grade 4/5 class in
Windermere Elementary School, two groups of grade 12 students interested
in careers in Biology at the "Biologists and Biodiversity"
conference and several groups of students from grades 2 to 4 at
the Living Landscapes display in Invermere during the Wings Over
the Rockies Bird Festival.
This project was also profiled at a weeklong art show at
the Pynelogs gallery in Invermere featuring the work of artist Marie
McLaughlin. In an effort
to bridge the artificial gap between art and science she created
art related to four different wildlife research projects in the
area, including this project.
Information about the project was on display and there was
an opportunity to talk to people about the project.
Another presentation about this project was also made at
the Living Landscapes conference in Fort Steele.
In addition to this, articles and/or photographs appeared
in 5 local or regional newspapers.
An unexpected result was the detection of malformed
frogs at two sites. Five
Pacific Chorus Frogs and one Western Toad were found at one site
and one Columbia Spotted Frog was found at another site.
All of these individuals had malformed hind limbs.
The occurrence of deformities in amphibians is a relatively
recent discovery. The
cause or causes of these deformities are still a topic of much debate
and a great deal of work is focussing on this problem.
Current hypotheses include environmental contaminants and
trematode parasites. There
is also some natural background level of malformities in amphibians
but this cannot explain all of the cases. At these two sites where malformities were observed there is
no obvious source of environmental pollution and it is difficult
to draw any conclusions about the cause of these malformed amphibians.
Despite no Northern Leopard Frogs being located, this project
was definitely successful in raising public awareness about the
status of Northern Leopard Frogs and amphibian declines in the area
by highlighting a local example of a relatively well known global
problem. The posters
combined with the newspaper articles and public presentations reached
many people and resulted in a great deal of interest and enthusiasm.
These media were also very effective at soliciting sightings.
We
learned a great deal about the distribution of some of the other
amphibian and reptile species.
Data such as this will be critical to monitoring any of these
species in the future. Had
this type of information existed for the distribution of Northern
Leopard Frogs before their decline, it would be extremely helpful
in trying to locate them now.
The decline of Northern Leopard Frogs is part of a worldwide phenomenon
of amphibian declines. It
is unknown exactly what effect the disappearance of this frog had
on the broader ecosystem related to its role as a predator of insects
or as prey for other species. These amphibian declines are a perplexing issue both from the
perspective of biodiversity conservation and the implications for
human health.
The future of Northern Leopard Frogs in the Columbia Basin
and the rest of British Columbia will undoubtedly involve intensive
efforts if this species is going to recover or even persist.
For the present it appears that Northern Leopard Frogs are
either absent from this part of the Columbia Basin or, at the very
best, are very rare.
|
|
|
|