---------- Forwarded message ----------
Date: Sat, 7 Dec 2002 03:44:52 -0600
From: Ian Pitchford <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: [evol-psych] The Evolution of Group-beneficial Traits in the
Absence of Between-group Selection.
J Theor Biol 2003 Jan 7;220(1):67-74 Related Articles, Links
The Evolution of Group-beneficial Traits in the Absence of Between-group
Selection.
DUGATKIN LA, PERLIN M, ATLAS R.
Department of Biology, University of Louisville, Louisville, KY, 40208, U.S.A.
One specific prediction emerging from trait-group models of natural selection
is that when individuals possess traits that benefit other group members,
natural selection will favor "cheating" (i.e. not possessing the
group-beneficial trait) within groups. Cheating is selected within groups
because it allows individuals to avoid bearing the relative costs typically
associated with group-beneficial traits, but to still reap the benefits
associated with the acts of other group members. Selection between groups
favors traits that benefit other group members. The relative strength of
within- and between-group selection then determines the equilibrium frequency
of those who produce group-beneficial traits and those that do not. Here we
demonstrate that individual-level selection, that is selection within groups
can also produce an intermediate frequency of such group-beneficial traits by
frequency-dependent selection. The models we develop are general in nature, but
were inspired by the evolution of antibiotic resistance in bacteria. The theory
developed here is distinct from prior work that relies on reciprocity or
kinship per'se to achieve cooperation and altruism among group members.
News in Brain and Behavioural Sciences - Issue 79 - 30th November, 2002
http://human-nature.com/nibbs/issue79.html
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