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Citation |
Dukas R, Yan JL, Scott AM, Sivaratnam S, Baxter CM. Evolution 2020; ePub(ePub): ePub. |
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Affiliation |
Animal Behaviour Group, Department of Psychology, Neuroscience & Behaviour, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4K1, Canada. |
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Copyright |
(Copyright © 2020, Society for the Study of Evolution, Publisher John Wiley and Sons) |
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DOI |
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PMID |
32372455 |
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Abstract |
Forced copulation is an extreme form of sexual aggression that can affect the evolution of sex-specific anatomy, morphology and behavior. To characterize mechanistic and evolutionary aspects of forced copulation, we artificially selected male fruit flies based on their ability to succeed in the naturally prevalent behavior of forced matings with newly eclosed (teneral) females. The low and high forced copulation lineages showed rapid divergence, with the high lineages ultimately showing twice the rates of forced copulation as the low lineages. While males from the high lineages spent more time aggressively pursuing and mounting teneral females, their behavior towards non-teneral and heterospecific females was similar to that of males from the low lineages. Males from the low and high lineages also showed similar levels of male-male aggression. This suggests little or no genetic correlations between sexual aggression and non-aggressive pursuit of females, and between male aggression towards females and males. Surprisingly however, males from the high lineages had twice as high mating success than males from the low lineages when allowed to compete for consensual mating with mature females. In further experiments, we found no evidence for trade-offs associated with high forced mating rates: males from the high lineages did not have lower longevity than males from the low lineages when housed with females, and four generations of relaxed selection did not lead to convergence in forced mating rates. Our data indicate complex interactions among forced copulation success and consensual mating behaviour, which we hope to clarify in future genomic work. This article is protected by copyright. All rights reserved. Language: en |
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Keywords |
Aggression; Drosophila melanogaster; artificial selection; forced copulation; mate choice; sexual selection |