[NatureNS] Frog over-population?

From: Christopher Majka <c.majka@ns.sympatico.ca>
To: naturens@chebucto.ns.ca
Date: Mon, 28 Jul 2008 16:44:44 -0300
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Hi Steve,

Although many frogs are green in varying degrees, the Green Frog (Rana  
clamitans) is a species unto itself. It is superficially similar to  
the Bull Frog (Rana catesbeiana) (although smaller), but has a dorso- 
lateral fold running down the back from the tympanum (ear). It's  
vocalization is quite different from that of either Bull or Leopard  
frogs.

Cheers,

Chris

On 28-Jul-08, at 3:53 PM, Stephen Shaw wrote:

> 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
>
>

Christopher Majka
Nova Scotia Museum, 1747 Summer St., Halifax, Nova Scotia, Canada  B3H  
3A6
c.majka@ns.sympatico.ca




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<html><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; ">Hi =
Steve,<div><br></div><div>Although many frogs are green in varying =
degrees, the Green Frog (<i>Rana clamitans</i>) is a species unto =
itself. It is superficially similar to the Bull Frog (<i>Rana =
catesbeiana</i>) (although smaller), but has a dorso-lateral fold =
running down the back from the tympanum (ear). It's vocalization is =
quite different from that of either Bull or Leopard =
frogs.</div><div><br></div><div>Cheers,</div><div><br></div><div>Chris</di=
v><div><br><div><div>On 28-Jul-08, at 3:53 PM, Stephen Shaw =
wrote:</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite"><div>OK but what's a "green frog"?<br>I think this =
nomenclature started on this current thread with Jim, but as =
a<br>resident alien species (me not the frog), I'd not heard that name =
before. &nbsp;Do<br>you mean the usually-named Northern Leopard Frog =
(Rana pipiens), aka meadow or<br>grass frog, or is Green Frog a =
different species? &nbsp;If it is the same species<br>(R. pipiens), is =
Green Frog a colloquial name restricted to the Maritimes? =
&nbsp;On<br>the appropriateness of the name if it is the same as R. =
pipiens, the base<br>colour (on which there are usually spots =
superimposed) often is not green but<br>light brown, as someone else =
remarked earlier.<br><br>On th