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Re: cause of Gigantism in sauropods
> Sorry, for not being clear: the
> hypothesized causal link would be that
> the dinosaur is able to consume the canopy of the tallest
> consequently largest) tree, if not, the forests formed by
> the said
> tree would reduce the primary production available for the
> dinosaur needs.
Why would we assume that they would by necessity feed on the canopy? Assuming
there's ample vegetation at the (say) 25 foot point of a 200 foot tree that a
given sauropod could reach, that alone would create a browsing-height based
selective pressure. In this case, plant height may have been driven by
competition for sunlight against other trees, while still providing a selective
force on sauropod neck size.