Evolution of postmating isolation: comparison of three models based on possible genetic mechanisms |
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Authors: | T I Hayashi M Kawata |
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Institution: | (1) Department of Ecology and Evolutionary Biology, Biological Institute, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan Tel. +81-22-217-6689; Fax +81-22-217-6689 e-mail: takehiko@biology.tohoku.ac.jp, JP;(2) Division of Ecology and Evolutionary Biology, Graduate School of Life Sciences, Tohoku University, Sendai, Japan, JP |
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Abstract: | In this study, we simulated the process of the evolution of postmating isolation using three models in which postmating isolation
is caused by (1) genetic divergence through collaborative coevolution, (2) genetic divergence through antagonistic coevolution
resulting from sexual conflict, and (3) genetic divergence through combinational incompatibility. The collaborative coevolution
model and the combinational incompatibility model showed a similar decreasing pattern of hybrid compatibility over generations
depending on population size and mutation rates. The antagonistic coevolution model showed that reproductive isolation can
evolve rapidly depending on the intensity of selection. In the combinational incompatibility model, the increasing number
of loci that interact and result in incompatibility would have both promoting and inhibiting effects on the formation of hybrid
incompatibility in the earlier stage of isolation. Mutation rates for genes causing incompatibility significantly affect the
number of generations required for postmating isolation, which indicates that models assuming high mutation rates (e.g., μ = 10−4) might predict much faster evolution for reproductive isolation than those observed in real populations.
Received: January 29, 2001 / Accepted: July 4, 2001 |
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Keywords: | Speciation Reproductive isolation Postzygotic isolation Coevolution |
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