Asymmetric reproductive isolation and interference in neriid flies: the roles of genital morphology and behaviour
Asymmetric reproductive isolation and interference in neriid flies: the roles of genital morphology and behaviour
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DOI：
10.1016/j.anbehav.2012.08.025
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发表时间：
2012-12-01
期刊：
影响因子：
2.5
通讯作者：
Bonduriansky, Russell
中科院分区：
文献类型：
--
作者：
Bath, Eleanor;Tatarnic, Nikolai;Bonduriansky, Russell
在进化生物学中，生殖隔离背后的过程和涉及的特征是相当大的争论的主题。研究物种在次生共生中代价高昂的性行为，这一现象被称为生殖干扰，有助于揭示过去和现在的隔离机制，以及共生对个体适合度的影响。我们研究了生殖器和行为这两组性状在两种澳大利亚线虫苍蝇繁殖隔离和干扰中的作用，这两种苍蝇是Telostilinus lineolatus和T.angusticollis。令人惊讶的是，尽管这些物种在雄性生殖器上有明显的差异，但在雌性生殖器上没有明显的差异，我们发现了生殖形态导致不对称生殖隔离的证据：线虫雄性可以将精子转移给雌性线虫，而线条线虫雄性不能将精子转移到雌性线虫身上。然而，这两种杂交方式都没有产生任何可行的杂交后代。行为反应也不对称地造成生殖隔离和生殖干扰。雄性同时追逐同种和异种雌性。两种雌虫对异种雄虫均有不同程度的歧视，但线虫雌虫对异种雄虫的辨别能力强于狭纹夜蛾雌虫。奇怪的是，狭角斑潜蝇的雄性与线形斑潜蝇雄性交配并试图与之交配，导致雄性斑潜蝇与同种雌性斑潜蝇交配成功率降低。我们的发现表明，生殖和行为特征都可以在生殖隔离中发挥重要作用，但这些特征的种间差异的后果可能令人惊讶地复杂，导致对种间相互作用的许多方面的不对称影响。(C)2012年动物行为研究协会。爱思唯尔有限公司出版。保留所有权利。
The processes underlying reproductive isolation, and the traits involved, are the subject of considerable debate in evolutionary biology. Studying the costly sexual interaction of species in secondary sympatry, a phenomenon known as reproductive interference, can help to shed light on past and present isolating mechanisms, as well as the implications of sympatry for individual fitness. We investigated the roles of two sets of traits, genitalic and behavioural, in reproductive isolation and interference in two species of Australian neriid flies, Telostylinus lineolatus and T. angusticollis. Surprisingly, although these species differ markedly in male but not in female genitalia, we found evidence that genital morphology resulted in asymmetric reproductive isolation: T. lineolatus males could transfer sperm to T. angusticollis females, but T. angusticollis males were unable to transfer sperm to T. lineolatus females. However, neither type of cross produced any viable hybrids. Behavioural responses also contributed asymmetrically to both reproductive isolation and reproductive interference. Males pursued both conspecific and heterospecific females. Females of both species discriminated against heterospecific males, but T. lineolatus females exhibited stronger discrimination than T. angusticollis females. Curiously, T. angusticollis males both fought and attempted to copulate with T. lineolatus males, resulting in reduced mating success for T. angusticollis males with conspecific females. Our findings show that both genitalic and behavioural traits can play important roles in reproductive isolation, but the consequences of interspecific divergence in these traits can be surprisingly complex, resulting in asymmetric effects on many aspects of interspecific interactions. (C) 2012 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.