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Re: Dinosaur morphogenesis



Stephan Pickering asked on 03/17/2002:

> Query: has anyone yet conducted a statistical analysis of the relationship between increased dinosaur body sizes
> known from high latitudes (= decreased temperatures)?
> At lower latitudes, dinosaurs are smaller, temperatures higher, ...

Martin Lockley took a look at sauropod and ornithopod footprint localities and their global distribution in "Tracking Dinosaurs" (1991).
In figure 10.1 he wrote "Distribution of Jurassic and Cretaceous brontosaur footprint localities, showing their predominance at low latitudes. Ornithopod tracks occur at higher latitudes."

AFAIK known fossils of ceratopsian and ornithopod dinosaurs of late cretaceous Alaska aren't bigger than related dinosaurs farther south.
And think about cretaceous Australia with it's small dinosaurs, which was at a higher latitude than today.

This would counter your general statement that at lower latitudes dinosaurs were smaller.

Cheers


Heinz Peter Bredow