green frog complex (1 Viewer)

jonafly

Well-known member

• Jul 8, 2004

• #1

Hi yall,

I don't know anything about frogs. As I read it's quite difficult to see what kind of green frog you're dealing with. Can anyone enlighten me on this one? And for example those markings on the back, are they consistent or variable?

Is it Rana lessonae, Rana ridibunda or Rana klepton esculenta?

 

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Joern Lehmhus

Well-known member

• Jul 8, 2004

• #2

Hi Andre,

My gut reaction is esculenta, but I am not sure-it is quite a long time since the last green frog species determinations I had to do (several years) so I´ll have a look at the literature-it may well be not possible to give a save id though....

Jörn

 

Joern Lehmhus

Well-known member

• Jul 12, 2004

• #3

Hi Andre,
I think it is impossible to id from a photo;
even if you have it in the hand and can do some measuring, there is some overlap in the measurements. And coloration is too variable to be save.
Also, I met a friend this weekend who works with european frogs at the university of Mainz and he said the safest thing for determination would be the voice ( if you don´t want to go into a genetical analysis ).

Sorry, this has to remain just a green frog, as I feared before.

Jörn

 

jonafly

Well-known member

• Jul 12, 2004

• #4

I'm sorry to hear that Jörn. Thought you knew everything. So you're human afterall!
Just kidding. Thanks a lot (again) for your trouble.

André

 

Joern Lehmhus

Well-known member

• Jul 15, 2004

• #5

Hi Andre,
just for the moment I´d be happy enough to know tomorrow´s weather ,

if it stays like this, I´ll have to work :storm: ;

and it´s neither birds nor bugs for me then...

Jörn

 

jonafly

Well-known member

• Jul 19, 2004

• #6

So what is your profession, Jörn. Clearing the woods of fallen trees or something?

André

 

Joern Lehmhus

Well-known member

• Jul 20, 2004

• #7

Well, at least I am in the fresh air as much as any lumberjack.

No what I am doing is testing of new plant protection products on side effects on beneficial arthropods and non target organisms . beneficials are insects like for example Ladybird beetles or spiders which can keep pest insect populations more balanced; non target organisms are in my case all arthropods that do not affect a crop in any way.

Such tests have to be done by independent companies , not by the producers of plant protection products themselves (those are our customers); and the company I work for does the studies for the national German or the European authorities on which it is decided to register a product or on the other hand to forbid it respectively not to allow its use.

Besides that, I paint(if I find the time)... mainly birds... but well you can´t live from that... B

and yes, I had to work on Saturday :storm:

 

jonafly

Well-known member

• Jul 22, 2004

• #8

Hi Jörn,

So what you test are chemical and biological plant protection products? Not the use of insects to reduce the quantity of harmfull (for the crops) other insects?
Or do I miss the point?

André

 

Joern Lehmhus

Well-known member

• Jul 27, 2004

• #9

Hi Andre,
what I test are the reactions of beneficial and also of non-pest insects on plant protection products. Those species must not be harmed too much (so say the official laws and guidelines, that require the testing).
The beneficials because they are our allies against the pest insects; the non-pest insects because they are important in the ecosystem , for example as food for other animals...

Jörn