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Re: How Did Hadrosaurs Survive?

On Tuesday, October 29, 2002, at 10:26 PM, Tim Donovan wrote:

Newly introducd predators have devastated some ecosystems. The brown tree snake wiped out nearly all of the native birds on Guam. New species, including predators, are said to evolve in isolation, then spread. Essentially there may be little difference between the effects of a newly evolved predator and a newly introduced one. The advent of Tyrannosaurus apparently resulted in the extinction of various Edmontonian taxa least able to fight it or evade it e.g. Euoplocephalus, which was replaced by a larger Lancian defender.

There is a BIG difference between the effects of a "newly evolved" predator and a newly introduced one. Evolution of a predator gives time for an evolutionary response from prey. Predators do not evolve in a vacuum. For this reason I take exception to the line "advent of Tyrannosaurus", as if Tyrannosaurus just "arrived". Tyrannosaurus evolved alongside hadrosaurids, and hadrosaurids with it - show me the fauna with tyrannosaurids but no hadrosaurids.

Euoplocephalus was one of the LEAST able to defend itself?! What possible reason could there be for thinking so? Such a statement seems manifestly absurd.

John Conway, Palaeoartist

"Do I contradict myself? Very well, then I contradict myself, I am large, I contain multitudes." - Walt Whitman

Systematic ramblings: http://homepage.mac.com/john_conway/
Palaeoart: http://homepage.mac.com/john_conway/_palaeoart.html
Skeletals: http://homepage.mac.com/john_conway/_skeletals/