Quantifying the gender load: can population crosses reveal interlocus sexual conflict?

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
Tristan A F LongAdam K Chippindale

Abstract

Six sister populations of Drosophila melanogaster kept under identical environmental conditions for greater than 600 generations were reciprocally crossed to investigate the incidence of population divergence in allopatry. Population crosses directly influenced fitness, mating frequency, and sperm competition patterns. Changes in both female remating rate and the outcome of male sperm competition (P1, P2) in response to foreign males were consistent with intersexual coevolution. Moreover, seven of the 30 crosses between foreign mates resulted in significant reductions in female fitness, whereas two resulted in significant increases, compared to local matings. This tendency for foreign males to reduce female fitness may be interpreted as evidence for either sexually antagonistic coevolution or the disruption of mutualistic interactions. However, instances in which female fitness improved via cohabitation with foreign males may better reveal sexual conflict, signalling release from the cost of interacting with locally adapted males. By this metric, female reproduction in D. melanogaster is strongly constrained by local adaptation by males, a situation that would promote antagonistic coevolution between the sexes. We conclude that...Continue Reading

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Citations

Apr 15, 2006·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Locke Rowe, Troy Day
Apr 15, 2006·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·C M Lessells
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Oct 20, 2018·Biology Letters·David C S Filice, Tristan A F Long
Nov 1, 2020·Journal of Evolutionary Biology·David C S FiliceReuven Dukas

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