Males do not prolong copulation in response to competitor males in the polyandrous fly Drosophila bifasciata
Males do not prolong copulation in response to competitor males in the polyandrous fly Drosophila bifasciata
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DOI：
10.1111/j.1365-3032.2012.00836.x
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发表时间：
2012-09-01
影响因子：
1.5
通讯作者：
Hurst, Gregory D. D.
中科院分区：
文献类型：
--
作者：
Lize, Anne;Price, Thomas A. R.;Hurst, Gregory D. D.
在许多类群中的男性表现出行为可塑性，以应对精子竞争的威胁。果蝇雄性在交配前对竞争对手的存在作出反应，延长交配时间。这种行为对雄性的好处在黑腹果蝇中很明显。然而，这一特性的适应性受到了挑战，因为它存在于其他四种果蝇物种中，其中两种主要是单雄的，这提高了这种可塑性在进化上不稳定的可能性。本文对双带果蝇（Drosophilabifasciatapominini）的行为可塑性和交配系统进行了研究。与其他果蝇物种相比，雄性果蝇D.双带绦虫在交配前有竞争者存在时，其交配持续时间没有表现出可塑性。因此，在果蝇属中，交配持续时间的可塑性并不是固定的。D. bifasciata也进行了检查。该物种是一妻多夫制的，但在果蝇属中并不常见，雄性将由精子组成的交配栓转移给雌性，交配后不久形成并充满雌性子宫。在D.双带虫可能来自精子栓。
Males in many taxa exhibit behavioural plasticity in response to the perceived threat of sperm competition. Drosophila males prolong mating in response to the presence of competitor males before copulation. The benefits of this behaviour to males are evident in Drosophila melanogaster. However, the adaptive nature of the trait is challenged by the observation that it is present in four other Drosophila species, two of which are largely monandrous, raising the possibility that this plasticity is not evolutionarily labile. In the present study, behavioural plasticity and the mating system in Drosophila bifasciata Pominini (Diptera, Drosophilidae) are analyzed. By contrast to other Drosophila species, male D. bifasciata do not exhibit plasticity in copulation duration when competitor males are present before mating. Thus, plasticity in mating duration is not fixed in the genus Drosophila. The mating system of D. bifasciata is also examined. The species is polyandrous but, uncommonly for the genus Drosophila, males transfer a mating plug composed of sperm to females, which forms very shortly after copulation and fills the female uterus. The absence of plasticity observed in D. bifasciata may arise from the sperm plug.