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Re: cause of Gigantism in sauropods

Seems I may have misunderstood you again. If by canopy you mean just the 
aboveground portion of the vegetation, then certainly. However, I'm still not 
convinced that maximal tree height would be the thing to look for, given the 
previously stated reasons.

--- On Mon, 2/14/11, Tor Bertin <nightimeshadow@yahoo.com> wrote:

> From: Tor Bertin <nightimeshadow@yahoo.com>
> Subject: Re: cause of Gigantism in sauropods
> To: dinosaur@usc.edu
> Date: Monday, February 14, 2011, 12:37 PM
> > Sorry, for not being clear: the
> > hypothesized causal link would be that
> > the dinosaur is able to consume the canopy of the
> tallest
> > (and
> > consequently largest) tree, if not, the forests formed
> by
> > the said
> > tree would reduce the primary production available for
> the
> > herbivorous
> > 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. 

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