Evolutionarily stable mixed mating in a variety of genetic systems |
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Authors: | Ronald M Nelson Jaco M Greeff |
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Institution: | (1) Department of Genetics, University of Pretoria, Pretoria, 0002, South Africa |
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Abstract: | Many species display a mixture of close inbreeding and outbreeding which is referred to as mixed mating. For selfing species,
models predict that such mixed mating systems can be stable. Conversely, models considering separate sex species have not
been able to explain mixed mating systems. This failure may be a result of the unrealistic assumption that recurrent inbreeding
does not increase the inbreeding coefficient. Here we show that mixed mating is expected in separate sex systems when recurrent
inbreeding is taken into account. A female that allows her brother to sibmate with her gives an extra mating opportunity to
said brother. This kin selective advantage should be strongest in genetic systems where the male is more related to the female.
In support of this idea, we find that inbreeding evolves most easily in selfers, followed by diploid sibmating, followed by
haplodiploid sibmating. Consideration of published values for the regression of fitness on inbreeding coefficient suggests
that many species fall in a range where some selfing/sibmating is optimal. |
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