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CRITFINC.TXT
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Harper, G.H. "A critical review of theories
concerning the origin of the Darwin finches
(Fringillidae, Passeriformes)" Journal of
Biogeography 14: 391-403, l987.
[Harper is in the Zoology Department, Edinburgh
University, West Mains Road, Edinburgh EH9 3JT,
UK.]
ABSTRACT--A multiple hypothesis approach is used to
consider the origin of the Darwin finches of the
Galapagos islands. Three simple hypotheses are
distinguished by the location of the barrier
thought to be responsible for genetic divergence of
populations in allopatry: (a) within the
archipelago, (b) between the archipelago and the
source area, and (c) within the source area. An
allopatric divergence index is described to help
identify the degree of isolation needed for full
speciation. While each hypothesis has some merit,
it is argued that they are probably inadequate
because each represents too simple a view of the
causes of a complex phenomenon. The most important
barrier in the speciation of the Darwin finches has
probably been the ocean between the archipelago and
the mainland.
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