Re: Why Large Gap Between Species...?

Noel Dickover (
Fri, 6 Dec 1996 09:58:57 -0500

In article <588lag$>, says...
> In article <58774n$>,
> Geoff Alex Cohen <> wrote:
> >Nat Turner ( wrote:
> >: Why do you assume there was "competition"? I doubt seriously if piths
> >: competed against hominids.
> >
> >I didn't assume. I'm saying that demography theory says that if there
> >is competition, both extinction of one species and coexistence of
> >multiple species are possible.
> >
> >But why would you doubt competition? There is a limited number of
> >appropriate sleeping habitats; there is a limited amount of fruit or
> >nuts available for eating; in an arid environment there may well be
> >a limited number of sources of water.
> Competition suggests different groups competing over scarce resources.
> What about "niche" theory? Would H. habilis, erectus, and H. sapiens
> competed over precisely the same resources? Certainly H. sapiens and the
> piths wouldn't have. And how was this competition played out anyway?
> Erectus kills off the piths, habilis kills off erectus, H. sapiens kill
> off habilis?
> Which begs the question, "Why didn't the piths kill off apes and chimps?"
> Nat

I don't think we can rule out the possibility that these groups could
still breed with one another, and that, through time, they evolved into a
single species.


Noel Dickover