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Re: Resources, energetics and dinosaur maximal size

On Mon, 27 Jul 2009, Jura wrote:

McNab operates under the assumption (laid out in the paper) that the largest terrestrial mammal known to have existed (_Paraceratherium_ sp.), was probably operating at, or near the maximum FMR for terrestrial animals in a terrestrial ecology. In this case, it would be about 170,0000 calories a day. The largest dinosaurs were about 8 times the size of _Paraceratherium_. If they were given a mammalian metabolism, and concomitant FMR (as detailed in the paper) then a 56 tonne _Brachiosaurus altithorax_ would have to digest some 561,000 calories a day. This is asking a lot for plant productivity of any time period.

It's asking a lot of the animal involved. That's a lot of eating and effort.