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- Tan, Cedric K. W., et al.
(författare)
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No evidence for precopulatory inbreeding avoidance in Drosophila melanogaster
- 2012
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Ingår i: Animal Behaviour. - : Elsevier BV. - 0003-3472 .- 1095-8282. ; 83:6, s. 1433-1441
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Tidskriftsartikel (refereegranskat)abstract
- Inbreeding depression can lead to the evolution of inbreeding avoidance before or after mating. However, despite widespread evidence of inbreeding depression, studies of inbreeding avoidance have generated different results across populations or species. These differences could potentially reflect the confounding effects of factors such as magnitude of inbreeding depression, sex, social familiarity, state of primary sexual receptivity and mating history. We examined the influence of these proximate factors on precopulatory inbreeding avoidance in a laboratory-adapted, outbred population of Drosophila melanogaster. We found a significant but low coefficient of inbreeding depression based on egg-adult viability measures. Controlling for sex-specific responses, familiarity, sexual receptivity and mating history, we found no evidence of precopulatory inbreeding avoidance. Mate choice of virgins was random with respect to relatedness and measurements of courtship frequency, mating latency and mating duration did not indicate any preference for unrelated partners. In fact, the only evidence for differential sexual behaviour in response to relatedness was that males first mated to unrelated females were significantly faster to remate with related females than with unrelated females. These results suggest that inbreeding avoidance may be limited in outbred populations of D. melanogaster, and fit theoretical predictions that inbreeding is not selected against in either sex when the coefficient of inbreeding depression is relatively low.
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- Tan, Cedric K.W., et al.
(författare)
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Sex-specific responses to sexual familiarity, and the role of olfaction in Drosophila
- 2013
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Ingår i: Proceedings of the Royal Society of London. Biological Sciences. - : Royal Society Publishing. - 0962-8452 .- 1471-2954. ; 280:1771, s. 20131691-
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Tidskriftsartikel (refereegranskat)abstract
- Studies of mating preferences have largely neglected the potential effects ofindividuals encountering their previous mates (‘directly sexually familiar’),or new mates that share similarities to previous mates, e.g. from the samefamily and/or environment (‘phenotypically sexually familiar’). Here, weshow that male and female Drosophila melanogaster respond to the direct andphenotypic sexual familiarity of potential mates in fundamentally differentways. We exposed a single focal male or female to two potential partners. Inthe first experiment, one potential partner was novel (not previously encountered)and one was directly familiar (their previous mate); in the secondexperiment, one potential partner was novel (unrelated, and from a differentenvironment from the previous mate) and one was phenotypically familiar(from the same family and rearing environment as the previous mate). Wefound that males preferentially courted novel females over directly or phenotypicallyfamiliar females. By contrast, females displayed aweak preference fordirectly and phenotypically familiar males over novel males. Sex-specificresponses to the familiarity of potential mates were significantly weaker orabsent in Orco1 mutants, which lack a co-receptor essential for olfaction, indicatinga role for olfactory cues in mate choice over novelty. Collectively, ourresults show that direct and phenotypic sexual familiarity is detected througholfactory cues and play an important role in sex-specific sexual behaviour.
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