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Posted by Colchicine on April 09, 2003 at 08:52:13:
In Reply to: neotenous tadpoles posted by Louis on April 09, 2003 at 04:44:42:
I really don't understand where you are getting your information. I have never heard of neoteny in anurans, so I looked it up in my Tadpoles book by McDiarmid and Altig. There is only one page (294) on Paedomorphosis. It makes no claim there is permanent neoteny in anurans. It explains how certain conditions (lush larval habitat and harsh adult habitat) may select for neoteny in caudates, but would only result in an extended larval stage and shortened adult stage in anurans.
Other than anecdotal observations, where do you get that tadpoles will stay neotenic (reproductively capable in a larval stage)??
There are two species that I am aware of,that have an extended larval stage, Rana clamitans and Rana catesbeiana, the latter can last for several years. There are suttle differences between these species and other ranids. I suspect that you find a lot of ranids with a few R catesbeiana mixed in.
You speak of "chemicals" but you include no specifics. With the potentially millions of chemicals we have introduced into the environment, you have figured which ones are responsible for an extended larval stage? Is your chemistry teacher going to publish his results? If so, it would be monumental in my opinion.
Yes, I think this is morally wrong to manipulate an animal into an unnatural state for the sake of having a cool pet.
Now, please provide more details.