Tuesday, June 20, 2006

Having a laugh

I thought since a few bloggers have been talking about ponds recently and Endment has just dug one, I'd show some frog pics. I can't decide what type of frogs these are, which should be strange since we have only one native frog (Rana temporia) in most of the UK (the pool frog (Rana lessonae) may have been native and has just been reintroduced into the norfolk broads).

rana ribunda

In the London area though we have some Ranids introduced from Europe in particular Rana ridibunda, the marsh frog. I think thats what these might be. Adult marsh frogs were calling nearby, their call (which gives them their latin name) is a harsh, chattering laugh (a bit like a kookabura's). Marsh frogs outgrow common frogs and could be seen as excluding our natives as they tend to take over the pools they like. I think in reality they are adopting the roles they have on the mainland with the common frogs abandoning habitat they wouldn't normally use in Europe but do here as there is, or rather was, no competition.

rana ribunda 2

As these are European natives I'm not too concerned about Marsh frogs as "invaders" species from different ecosystems altogether such as Rana catesbiana (the American bullfrog) are far more problematic and at the moment seem to be under control. Also I really like the marsh frog's laugh.

1 comment:

Endment said...

Well - even if we haven't completely finished the pond --- we have water in and tonight i heard a frog - haven't a clue if it is in the pond or just in the yard but the pond is waiting :)
You have a photo of a handsome little fellow - wish I could hear him laugh :)