[NatureNS] Frog over-population?

Date: Mon, 28 Jul 2008 15:53:29 -0300
From: Stephen Shaw <srshaw@Dal.Ca>
To: naturens@chebucto.ns.ca
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OK but what's a "green frog"?
I think this nomenclature started on this current thread with Jim, but as a
resident alien species (me not the frog), I'd not heard that name before.  Do
you mean the usually-named Northern Leopard Frog (Rana pipiens), aka meadow or
grass frog, or is Green Frog a different species?  If it is the same species
(R. pipiens), is Green Frog a colloquial name restricted to the Maritimes?  On
the appropriateness of the name if it is the same as R. pipiens, the base
colour (on which there are usually spots superimposed) often is not green but
light brown, as someone else remarked earlier.

On the original question of overpopulation, R. pipiens has almost 
disappeared in
western Canada (BC and AB) since the 70s, but seems not to be threatened in
central Canada; not sure about the Maritimes. The cause of western decline in
this particular species seems uncertain from the little I've read.  Maybe also
a chytrid (spelling?) problem spread originally from clawed frog Xenopus to
other amphibians, or else a debilitating trematode parasite?  Does anyone on
NNS have specialist info on the cause of decline for this species, as opposed
to that for amphibians generally, worldwide?
Steve

Quoting Ken McKenna <kenmcken@eastlink.ca>:
> Ken McKenna
> Box 218 Stellarton NS
> B0K 1S0
> 902 752-7644
> Hi Randy and Liz
> Randy is correct. I believe the frogs in McGee Pond are Green Frogs. 
> They look quite a bit like Bullfrogs.  During the Herp atlas I had a 
> single bullfrog in Pictou Co.between Pictou and River John. They are 
> nearby in Colchester in the Tatamagoughe area and south in 
> Guysborough Co., but still not common to have bullfrogs in Pictou Co. 
> I heard a bullfrog somewhere in northern Guysborough this summer 
> while doing the bird atlas.
> cheers
> Ken
>  ----- Original Message -----
>  From: Randy Lauff
>  To: naturens@chebucto.ns.ca
>  Sent: Sunday, July 27, 2008 2:43 PM
>  Subject: Re: [NatureNS] Frog over-population?
>
>
>  These are Green Frogs, Liz.
>
>  Our only tree frogs are the spring peeper...a very small frog. 
> Bullfrogs are not listed as being present in Pictou County according 
> to Gilhen's book (1984). Perhaps all the effort of volunteers a few 
> years ago in doing the Herp Atlas came up with reliable sightings for 
> Pictou (or Antigonish). I get a number of folks every year telling me 
> of Bullfrogs up my way - only once have they turned out to be 
> Bullfrogs (normally, they're Green Frogs) - and these were just over 
> the Antigonish border into Guysborough County.
>
>  And we could be so fortunate to have an overpopulation of frogs!
>
>  Randy
>
>
>  2008/7/27 Elizabeth Doull <edoull@ns.sympatico.ca>
>
>    Wednesday, July 23, 2008
>
>    There were at least 22 frogs in MacGee Pond in Big Island!   All 
> of them were sporting a bright yellow breast, reminding me of Yellow 
> breasted Chats.  Which species?   They could be either Tree or Bull 
> Frog? They were large.  Some of them had light brown backs while the 
> others had green back.
>
>    Cheers, liz
>
>
>  _________________________________
>  RF Lauff
>  Way in the boonies of
>  Antigonish County, NS.
>



-- 
Stephen R. Shaw Ph.D.
Dept of Psychology & Neuroscience
Dalhousie University
1355 Oxford Street
Halifax, Nova Scotia, Canada B3H 4J1
e-mail: srshaw@dal.ca
phone: 1-902-494-2886
fax: 1-902-494-6585


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