Re: Savannah and Grassland

Harry Erwin (
Sat, 14 Oct 1995 12:23:21 -0400

In article <45lbmh$>, (Rick Cook) wrote:

> Harry Erwin wrote:
> > Homo is the keystone because the alternative
> >source of fire (lightning- caused) is rare in temperate grassland and
> >unknown in tropical savannah.
> >
> There are other species which can be keystones for this process, notably
> browsers such as elephants. I understand that the elephants, giraffes and
> other browsers have a lot to do with maintaining the African veldt.
> --RC

Yes--the elephants in particular, but the savannah system becomes rapidly
overgrown with brush and trees unless it is regularly burned.

Harry Erwin
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PhD student in comp neurosci: "Glitches happen" & "Meaning is emotional"