[Marxism] human origins
cbrown at michiganlegal.org
Thu Aug 11 09:06:45 MDT 2005
I think this is something of a non-problem. People frequently bring
up this point, but there's a good deal of evidence that speciation
and the acquisition of distinct characteristics, at least in animals,
are usually coincidental.
CB: Seems to me the basic idea of punctuated equilibrium contradicts this
generalization. Or "punctuated equilibrium" is essentially the opposite
During the "equilibria", isn't what is being said that there are changes,
i.e. new characteristics arise, but these characteristics do not amount to
speciating changes ? Speciation only arises at the rare punctuations.
Meanwhile most of the time, most changes create a variety of types within
the species, but not new species. There are populations with distinct
traits from other populations of the species, but they can interbreed if the
come into contact. That's what equilibrium is. "Circular" motion. It is not
stasis, but change that goes in "circle". In this case, a circle is metaphor
for the more things change, the more they stay the same, species wise. Only
with a rare punctation, is there real change, non-circular, non-equilibrated
change. Equilibrated change is that which stays with certain parameters. A
puncuation breaks out of those parameters.
The equilibrated stages of "punctuated equilibrium" are developments of
varieties of traits (bunched in populations) within a species , no ? The
punctuation stages are bursts of speciation.
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