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Re: Dinosaur ecology: hermetically sealed?
On Thu, 13 Apr 2000, Larry Dunn wrote:
> From what I recall, even the most enthusiastic "meteor
> people" admit that a calamity like such an impact
> would have pushed already-stressed populations over
> the brink rather than being the sole cause of their
I'm not sure this addresses my point regarding an actual mechanism, viz,
if there were prey available, how come they starved to death? However, I
do agree there were likely many causative factors. As you know, though, I
argue the smart bullet effect, the apparent targeting of dinosaurs alone
among terrestrial vertebrates is suggestive of predation rather than
scattershot of global physical effects. I feel the subsequent
effectiveness of predation limiting the large egglaying lifestyle is also
suggestive of a coming-of-age of animals--mammals and birds--to a point
where they could have an effect on dinosaurs.
> How do you account for the
> extinction of many other species, particularly the
> marine reptiles?
I was talking about terrestrial species only. And I'm not arguing that a
bolide didn't hit and didn't have global effects. I just don't think it
does a good job--by itself, at least--of explaining dinosaur extinction.
I don't know about marine species. I do think the relative success of
fish despite the argued collapse of marine food chain, is a similarly
difficult challenge--apparently there was more hermetic sealing for the