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Re: Size of *Neoceratodus africanus* and ...






--- On Mon, 3/30/09, don ohmes <d_ohmes@yahoo.com> wrote:

> From: don ohmes <d_ohmes@yahoo.com>
> Subject: Re: Size of *Neoceratodus africanus* and ...
> To: dinosaur@usc.edu
> Date: Monday, March 30, 2009, 1:42 PM
> --- On Mon, 3/30/09, Raptorial Talon
> <raptorialtalon@gmail.com> wrote:
> 
> > "You could be right.  The cranial adaptations of
> > spinosaurs might
> > indeed have been geared toward improved piscivory. 
> But I
> > doubt this
> > is why spinosaurids got so big."
> > 
> > I can certainly agree with that. I don't think
> diet was
> > the cause of
> > their size. But whatever they were eating had to be
> capable
> > of
> > enabling that size, so it must have been pretty
> readily
> > available in
> > one sense or another.
> 
> Various forms of intra-specific competition have been
> mentioned as reason for Spinosaurus to attain maximal size,
> so I'll skip those, and go interspecific. 
> 
> If, as a biped, you spend a lot of time catching fish,
> specifically exploiting fluvial systems w/ lot of shallow
> water and fluctuating water levels, you will be competing w/
> crocs, or just trying to stay off _their_ menu. Especially
> around those drying pools w/ the trapped fish. Reason enough
> to attain large size, as well as maintain a high degree of
> terrestrial competence.

The double threat. Having Land AND water at their disposal may have been a 
large key to the Spinosaurs success. Bigger size meant defense against Giant 
Crocs and Giant land based Carnosaurs and was maintainable do to multiple 
options. And I'll bet small and medium sized crocs were on the menu.