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Postmating Sexual Selection Favors Males That Sire Offspring

Summary: Postmating Sexual Selection
Favors Males That Sire Offspring
with Low Fitness
Trine Bilde,1,2
* Anne Foged,2
Nadia Schilling,2
Göran Arnqvist1
Despite the costs of mating, females of most taxa mate with multiple males. Polyandrous females
are hypothesized to gain genetic benefits for their offspring, but this assumes paternity bias
favoring male genotypes that enhance offspring viability. We determined net male genetic effects
on female and offspring fitness in a seed beetle and then tested whether fertilization success was
biased in favor of high-quality male genotypes in double mating experiments. Contrary to
expectations, high-quality male genotypes consistently had a lower postmating fertilization success
in two independent assays. Our results imply that sexually antagonistic adaptations have a major
and unappreciated influence on male postmating fertilization success. Such genetic variation
renders indirect genetic benefits an unlikely driver of the evolution of polyandry.
ur understanding of the evolution of mul-
tiple mating by females (i.e., polyandry)
in the face of the costs of mating is


Source: Arnqvist, Göran - Department of Animal Ecology, Uppsala Universitet


Collections: Environmental Sciences and Ecology