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Re: Crocs, Amphibians, Small dinosaurs and the Impact theory.
Now that it seems like Listproc doesn't like French university servers, but
has nothing against Austrian ones...
I've heard Bakker use the fact that amphibians are the
most sensitive to climate change to argue against the
Impact Theory and in favor of disease.
Some seem to be sensitive, others not...
What about in
the Permian-Triassic extinction event? Does he favor
disease there too?
Has he ever talked about that one...?
Moving to the other side. I admit that frogs are very
The wood frog, *Rana sylvatica* (North America all the way to the Arctic
Circle), simply freezes in winter. Half of the body water freezes, and each
cell, filled with glucose and urea to prevent freezing, survives the winter
on its own. Of course this is a quite extreme example, but in the light of
desert frogs, for example, I wouldn't say that frogs in general are "very
So if the Permian-Triassic
extinction was caused by a massive drought and
What's the evidence for a drought? AFAIK there is only evidence for the
large-scale disappearance of vegetation, which may have been caused by
drought or (more probably) something else.
In WWM the labyrinthodont "cocooned" itself (in what
exactly?) in an attempt to wait out the drought. Do
amphibians do this?
A few do http://tolweb.org/tree?group=Sirenidae&contgroup=Caudata, and so do
lungfish (with self-made slime). But keep in mind that today's amphibians
are more closely related to us than to any "labyrinthodont".
The same question for Crocodiles as well. If they
cannot tolerate colder climates (which is why
labyrinthodonts survived for extended periods in
colder areas?) how can they tolerate the sun being
The Mississippi alligator does tolerate freezing... just not too much.
Crocodiles and temnospondyls seemingly coexisted happily throughout the
Jurassic, so I don't see why they should have competed.
it says that the since only fern species were dominant
after the K-T boundary all the herbivorous dinosaurs
including the small "polar dinosaurs" died out. How is
this evidence as to why the "polar dinosaurs" died out
if they were more adapted to the cold and (as far as I
know) weren't ferns an adequate food source for the
I'd simply say it is not evidence. We don't know who liked ferns and who