Bidirectional selection for female propensity to remate in the bean beetle, <Emphasis Type="Italic">Callosobruchus chinensis</Emphasis> |
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Authors: | Tomohiro Harano Takahisa Miyatake |
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Institution: | (1) Laboratory of Evolutionary Ecology, Graduate School of Environmental Science, Okayama University, Okayama 700-8530, Japan;(2) Present address: Laboratory of Ecological Science, Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka 812-8581, Japan |
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Abstract: | The evolution of female multiple mating, or polyandry, is difficult to comprehend and thus has been the subject of a large
number of studies. However, there is only a little evidence for genetic variation in polyandry, although the evolution of
a trait via selection requires genetic variation that enables the trait to respond to selection. We carried out artificial
selection for increased and decreased female propensity to remate as a measure of polyandry to investigate whether this trait
has a genetic component that can respond to selection in the adzuki bean beetle, Callosobruchus chinensis. Artificial selection produced responses in both directions and divergence between the selection lines in the female propensity
to remate. Although the experimental design adopted in this study selected jointly for female receptivity to remating, which
is a trait of females, and male ability to inhibit female remating—both of which are associated with female propensity to
remate—the observed response to selection was attributable only to the female receptivity to remating. This study indicates
that the female receptivity to remating has significant additive genetic variation and can evolve according to whether remating
is advantageous or disadvantageous to females in C. chinensis. |
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Keywords: | Artificial selection Genetic variation Female receptivity Multiple mating Polyandry Sexual selection |
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