Assessing the potential for post-ejaculatory female choice in a polyandrous beach-spawning fish,Journal of Evolutionary Biology

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Assessing the potential for post-ejaculatory female choice in a polyandrous beach-spawning fish
Journal of Evolutionary Biology ( IF 2.1 ) Pub Date : 2020-01-11 , DOI: 10.1111/jeb.13579
Dara N Orbach _{1,

2} , Anna C Rooke ₃ , Jonathan P Evans ₄ , Trevor E Pitcher ₅ , Craig F Purchase ₃

Affiliation

In species with limited opportunities for pre‐ejaculatory sexual selection (behavioural components), post‐ejaculatory mechanisms may provide opportunities for mate choice after gametes have been released. Recent evidence from a range of taxa has revealed that cryptic female choice (i.e., female‐mediated differential fertilization bias), through chemical cues released with or from eggs, can differentially regulate the swimming characteristics of sperm from various males and ultimately determine male fertilization success under sperm competition. We assessed the potential role that such female‐modulated chemical cues play in influencing sperm swimming characteristics in beach‐spawning capelin (Mallotus villosus), an externally fertilizing fish that mates as couples (one male and one female) or threesomes (two males and one female) with presumably limited opportunities for pre‐ejaculatory sexual selection. We assayed sperm swimming characteristics under varying doses and donor origins of egg cues and also examined the possibility of assortative mating based on body size. We found mating groups were not associated by size, larger males did not produce better quality ejaculates, and egg cues (regardless of dosage or donor identity) did not influence sperm swimming characteristics. Our findings suggest that intersexual pre‐ejaculatory sexual selection and cryptic female choice mediated by female chemical cues are poorly developed in capelin, possibly due to unique natural selection constraints on reproduction.

中文翻译：

评估一妻多夫海滩产卵鱼射精后雌性选择的可能性

在射精前性选择（行为成分）机会有限的物种中，射精后机制可能会在配子释放后为配偶选择提供机会。来自一系列分类群的最新证据表明，通过与卵一起释放或从卵中释放的化学线索，神秘的雌性选择（即雌性介导的差异受精偏差）可以差异调节来自不同雄性的精子的游泳特征，并最终决定雄性受精的成功在精子竞争下。我们评估了这种雌性调节的化学线索在影响海滩产卵毛鳞鱼（Mallotus villosus）精子游泳特性方面的潜在作用，一种外部受精鱼，以夫妇（一雄一雌）或三人一组（两雄一雌）的形式交配，推测射精前性选择的机会有限。我们分析了不同剂量下的精子游泳特征和卵子线索的供体来源，并检查了基于体型的分类交配的可能性。我们发现交配组与大小无关，较大的雄性不会产生更好的射精质量，并且卵子线索（无论剂量或供体身份如何）不会影响精子游泳特征。我们的研究结果表明，雌性化学线索介导的双性人射精前性选择和神秘的雌性选择在毛鳞鱼中发育不良，可能是由于独特的自然选择对繁殖的限制。

更新日期：2020-01-11

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