Re: Bipedalism in different substrates

From: deowll (deowll_at_bellsouth.net)
Date: 07/03/04 

Date: Sat, 3 Jul 2004 15:16:31 -0500

"Bob Keeter" <rkeeter@earthlink.net> wrote in message
news:BQwFc.23803$bs4.8163@newsread3.news.atl.earthlink.net...
>
> "Jason Eshleman" <jae@ucdavis.edu> wrote in message
> news:b7af43cb.0407022320.433a5f26@posting.google.com...
>
> Snip. . .
>
> > > Anything that causes a major portion of a population of apes to
> > > spend more time doing something is going to have some selection
> > > in favor of what ever the heck it is they are doing unless of course
> > > they don't need to.
> > >
> > > I will grant that apes are only moderately well adapted to walking
erect
> and
> > > that if they spent more time doing it selection would favor those
better
> > > adapted no matter what the reason.
> >
> > Sorry, but you're propagating one of the classic misunderstandings of
> > evolutionary biology. It matters not how much time you engage in an
> > activity if it doesn't affect survival or reproductive success. Apes
> > can walk around all day or not at all. In neither case will it
> > produce adaptive change *unless* their success at such activities
> > influences their reproductive success. This is a very important point
> > that seems to be glazed over more often than it should. The reasons
> > are important.
>
> I would add one caveat to your comment. If, lets say, a creature gets 25%
> of its food by virtue of walking/standing upright (for example, picking
> fruit off of low limbs), and 75% of its food quadrupedally picking up
grubs,
> fallen fruit, etc. Then the time spent is at least indirectly important,
> but ONLY because of the differences in food production, and at least in
this
> case, I would expect that adaptations would favor the quadrupedal.
>
> Regards
> bk
>
>
Would that depend on which method actually produced the most and best food?

Would it be effected by the speed at which food could be acquired?

What if one method of feeding permitted resource to be reached that could
not be exploited otherwise?

Then of course feeding cost fuel. Which method gets the most good payback
for the least cost?

Which method of feeding is safer?

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