Evidence of sperm removal behaviour in an externally fertilizing species and compensatory behaviour for the risk of self-sperm removal
Evidence of sperm removal behaviour in an externally fertilizing species and compensatory behaviour for the risk of self-sperm removal
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体外受精物种的精子去除行为以及对自体精子去除风险的补偿行为的证据
DOI：
10.1098/rspb.2020.2004
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Sato Noriyosi
中科院分区：
文献类型：
--
作者：
Takegaki Takeshi;Nakanishi Ayako;Kanatani Yosuke;Kawase Shoma;Yoshida Masa-aki;Sato Noriyosi
从雌性精子储存器官中移除竞争精子是一种强大的精子竞争避免机制，仅在内部受精物种中有报道，而在外部受精物种中根本没有报道。这项研究首次证明，抱巢的雄性Bathygobius fuscus是一种在外部受精的海鱼，通过在巢内表现出尾巴扇动的行为，将竞争对手运动鞋雄性的精子从产卵巢中移走。当人工将精液注入巢中时，雄鸟表现出尾巴扇动的行为，但当注入海水时，雄鸟不会表现出这种行为，在开放的巢中，这种行为会导致焦点雄鸟的父亲率更高。精子去除行为会带来去除自身精子的风险；因此，为了从精子去除效应中获益，额外的精子释放行为可能是必要的。与此一致的是，与海水注射处理相比，雄性风扇后精子在精液中的释放行为增加得更多。此外，移除精子时间较长的男性在移除精子后释放精子的时间更长，这表明额外的精子释放行为补偿了他们自己精子的损失。这些结果表明，精子去除行为并不局限于内部受精的有机体，值得在该物种和其他物种中进行进一步的研究。
The removal of rival sperm from a female's sperm storage organ acts as a strong sperm competition avoidance mechanism, which has been reported only in internally fertilizing species and not at all in externally fertilizing species. This study demonstrated for the first time that nest-holding males ofBathygobius fuscus, an externally fertilizing marine fish, remove the sperm of rival sneaker males from the spawning nest by exhibiting tail-fanning behaviour within the nest. Males showed tail-fanning behaviour when semen was artificially injected into the nest but not when seawater was injected, and in open nests this behaviour resulted in higher paternity rates for the focal male. The sperm removal behaviour entails the risk of removing their own sperm; therefore, additional sperm release behaviour is likely necessary to benefit from the sperm removal effect. Consistent with this, males increased post-fanning sperm release behaviour more in the semen than in the seawater injection treatment. Moreover, males who had removed sperm for a longer time spent more time releasing sperm after the removal, suggesting that the additional sperm release behaviour compensated for the loss of their own sperm. These results suggest that sperm removal behaviour is not restricted to internally fertilizing organisms and deserves further investigation in this and other species.
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