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Seeking a Sex-Specific Coolidge Effect in a Simultaneous Hermaphrodite

机译：在同时雌雄同体中寻求特定性别的柯立芝效应

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In polygamous mating systems, a capability to discriminate against familiar mates may be beneficial to both sexes. Polyandrous females, for instance, may enhance the odds of finding sires with optimal genetic compatibility or high genetic quality by mating with multiple different males; polygynous males, in addition, may more efficiently invest their limited ejaculates across multiple (rather than single) females. The Coolidge effect facilitates this kind of mate discrimination, as sexual motivation declines across consecutive copulations with a familiar partner but resurrects with a novel mate. In simultaneous hermaphrodites, we expect the Coolidge effect to show sex role-dependent patterns and vary with previous sex-specific mating activity. Using the promiscuous hermaphroditic sea slug Chelidonura sandrana, we investigated (1) whether sexual motivation indeed declines when repeatedly exposed to familiar partners, (2) whether the Coolidge effect occurs in a sex-specific manner and (3) whether ejaculation is strategic with respect to partner familiarity. We found neither mating latency, nor penis intromission duration, mating propensity or the frequency of sex role alternations to vary significantly with treatments. Furthermore, slugs did not donate larger ejaculates to novel than to familiar partners. Partner novelty thus elicited no detectable response in sexual motivation or mating effort in C.sandrana. We suggest that the sea slugs' promiscuous mating system in often large mating aggregations makes mate discrimination based on novelty obsolete in comparison with more relevant criteria such as partner body size or mating history.
机译：在一夫多妻制的配偶系统中，区分熟悉的伴侣的能力可能对男女双方都有利。例如，一夫多妻制雌性通过与多个不同的雄性交配，可以增加寻找具有最佳遗传相容性或高遗传品质的父系的几率;此外，一夫多妻制的雄性可能更有效地将其有限的射精投入多（而不是单）雌性。柯立芝效应促进了这种配偶的歧视，因为性动机在与一个熟悉的伴侣的连续交配中下降，而在与一个新配偶时复活。在同时的雌雄同体中，我们期望柯立芝效应显示出性别角色依赖性模式，并随着以前的性别特定交配活动而变化。我们使用混杂的雌雄同体的海参Chelidonura sandrana，调查了（1）反复暴露于熟悉的伴侣时性动机是否确实下降了;（2）Coolidge效应是否以性别特定的方式发生;以及（3）射精是否具有战略意义搭档熟悉。我们发现，交配潜伏期，阴茎植入持续时间，交配倾向或性别角色交替的频率均未随治疗而显着变化。此外，对小说的捐赠不超过对熟悉的伴侣的捐赠。因此，伴侣的新颖性在沙门氏菌的性动机或交配努力中未引起可检测到的反应。我们建议，与较大的相关标准（例如伴侣的体型或交配史）相比，通常在大型交配聚集体中海large的混杂交配系统会使基于新奇性的配偶歧视过时。

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