Effects of inbreeding on life-history traits and sexual competency in decorated crickets
Effects of inbreeding on life-history traits and sexual competency in decorated crickets
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近亲繁殖对装饰蟋蟀生活史特征和性能力的影响
DOI：
10.1016/j.anbehav.2019.05.027
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发表时间：
2019
期刊：
影响因子：
2.5
通讯作者：
Sadd, Ben M.
中科院分区：
文献类型：
--
作者：
Sakaluk, Scott K.;Oldzej, Jeannine;Poppe, Christine J.;Harper, Jenny L.;Rines, Ian G.;Hampton, Kylie J.;Duffield, Kristin R.;Hunt, John;Sadd, Ben M.
亮点近交系雌性蟋蟀比近交系雌性蟋蟀产生的后代更少。近交系雌性比近交系雄性更喜欢自己的近交系雄性。近交系雄性比近交系雄性更有可能转移精荚。近亲繁殖对性能力的抑制在雄性中更严重。近亲繁殖对交配的不同性别的影响与理论一致。尽管近亲繁殖抑制在生活史特征中得到了很好的表征，但近亲繁殖对交配行为和性选择特征的影响还没有得到很好的研究。在这里，我们评估了雌性装饰蟋蟀的一些与健康相关的生殖参数中近亲繁殖抑制的水平。我们预测，由于近亲交配的直接负面影响，以及近亲交配对免疫的影响所表明的生殖与当前生存之间的潜在权衡，近亲交配的雌性动物的生殖输出将显著低于近亲交配的雌性动物。我们还研究了近亲交配对交配能力的性别影响，特别关注了雌性选择雄性的决定以及雄性转移精囊的能力。我们预测，任何近亲交配能力的抑制都应该在精巢转移的成功中比在雌性越来越大的倾向中更明显，因为雄性的交配成功和健康之间的联系比雌性更紧密。与近亲繁殖的雌性相比，近亲繁殖的雌性产生的后代更少，发育时间更长，这一结果与理论一致，因为近亲繁殖的衰退预计会更严重，因为近亲繁殖的特征与健康状况联系更紧密。近亲交配对性能力也有性别特异性的影响。近亲交配的雌性比近亲交配的雌性更不可能骑上近亲交配的雄性。无论雌性近亲繁殖状态如何，近亲繁殖的雄性比近亲繁殖的雄性转移精囊的可能性要小得多。这些结果表明，近亲繁殖可能会对性能力产生意想不到的后果，并突显了在评估种群内近亲繁殖的影响时考虑交配行为的重要性。
HighlightsInbred female crickets produced fewer offspring than outbred females.Inbred females preferred males of their own inbred line over outbred males.Outbred males were more likely to transfer a spermatophore than inbred males.Inbreeding depression in sexual competency was more severe in males.Differential sex-specific effects of inbreeding on copulation align with theory.Although inbreeding depression in life-history traits has been well characterized, inbreeding effects on mating behaviour and sexually selected traits have been less well studied. Here, we assess levels of inbreeding depression in a number of fitness-related reproductive parameters of female decorated crickets, Gryllodes sigillatus. We predicted that due to direct negative effects of inbreeding and a potential trade-off between reproduction and current survival, as suggested by effects of inbreeding on immunity, inbred females would show significantly reduced reproductive output compared with outbred females. We also examined sex-specific effects of inbreeding on mating competency, focusing specifically on the female's decision to mount a male and the male's ability to transfer a spermatophore. We predicted that any inbreeding depression in sexual competency should be more evident in the success of spermatophore transfer than in female mounting propensity because of the tighter link between mating success and fitness in males than in females. Inbred females produced fewer offspring with longer development times compared with outbred females, results consistent with theory, as inbreeding depression is expected to be more severe for traits more tightly coupled with fitness. Inbreeding also had sex-specific effects on sexual competency. Inbred females were less likely to mount outbred males than were outbred females to mount inbred males. Inbred males were significantly less likely than outbred males to transfer a spermatophore regardless of female inbreeding status. These results reveal that inbreeding may have unexpected consequences for sexual competency and highlight the importance of considering mating behaviour when assessing effects of inbreeding within populations.
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