The effect of predation risk on post-copulatory sexual selection in the Japanese pygmy squid
The effect of predation risk on post-copulatory sexual selection in the Japanese pygmy squid
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捕食风险对日本侏儒乌贼交配后性选择的影响
DOI：
10.1007/s00265-018-2540-4
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发表时间：
2018
影响因子：
2.3
通讯作者：
Takegaki Takeshi
中科院分区：
文献类型：
--
作者：
Sato Noriyosi;Uchida Yu;Takegaki Takeshi
摘要雄性动物明显的性特征（如雄性间竞争的武器和求偶雌性动物的炫耀）可能会吸引捕食者。在高捕食风险的条件下，雌性通常会对配偶变得不那么挑剔，以减少在择偶上花费的时间。然而，交配后的性特征，如精子竞争的精子射精和精子去除的神秘女性的选择（CFC），可能会增加捕食风险，因为他们更不显眼的捕食者。为了检验这一假设，我们观察到的生殖行为，在日本的侏儒鱿鱼，Idiosepius paradoxus，其中男性重视射精的精囊女性的身体和女性删除交配后的精囊。鱿鱼从两个人口（Ohmura和冲），低和高捕食水平，分别在坦克交配控制存在/不存在的捕食条件下。在大村个体中，在捕食者存在的情况下，精囊去除受到抑制。女性可能无法有效地消除精囊时，面对捕食者，因为他们觉得受到威胁的捕食者，因此，更多的精囊保留在试验中，他们暴露于捕食者。相比之下，鱿鱼从冲（高捕食）人口，这是暴露于更高的捕食风险，没有强烈的影响捕食者的存在。当雄性射出更多的精囊时，雌性会取出更多的精囊。性冲突的影响可能大于捕食风险的俾格米鱿鱼。这表明适应性差异后交配性选择性状与predation.Significance statementIn一般情况下，交配前性选择的强度随着捕食风险的增加而降低，因为性特征吸引捕食者。然而，交配后的性特征往往是不显眼的可能不会受到捕食风险。在实验捕食者存在/不存在条件下，研究了来自两个不同捕食水平种群的日本矮乌贼交配后的行为。在低捕食者，个体精子排斥女性（交配后性状）被抑制在捕食者的存在。相比之下，来自高捕食种群的个体报告精子排斥没有变化。与交配前的性选择，交配后的女性选择抑制捕食者的存在，从一个低捕食的个人之间。然而，交配后女性的选择不受捕食者的存在，从高捕食人口之间的个人。这可能表明捕食驱动的适应性差异和塑性反应后交配性状。
AbstractConspicuous male sexual traits (e.g. weapons for male–male competition and displays for courting females) may attract predators. Under conditions of high predation risk, females typically become less choosy with respect to mates to reduce the time spent on mate selection. However, post-copulatory sexual traits, such as sperm ejaculation for sperm competition and sperm removal for cryptic female choice (CFC), may increase with predation risk because they are more inconspicuous to predators. To examine this hypothesis, we observed the reproductive behaviour in the Japanese pygmy squid,Idiosepius paradoxus, in which the male attaches ejaculated spermatangia to the female’s body and the female removes the spermatangia after copulation. Squid from two populations (Ohmura and Oki), with low and high predation levels, respectively, were copulated in tanks under controlled presence/absence of predator conditions. Among the Ohmura individuals, spermatangia removal was suppressed in the presence of a predator. Females may not be able to remove spermatangia effectively when facing a predator because they feel threatened by the predator; as a result, more spermatangia were retained during trials in which they were exposed to predators. In contrast, squid from the Oki (high predation) population, which is exposed to a higher predation risk, were not strongly affected by the predator presence. While the males ejaculated more spermatangia, the females removed more of them. The effect of sexual conflict may be greater than that of the predation risk in the pygmy squid. This suggests adaptive differences in post-copulatory sexual selection traits linked to predation.Significance statementIn general, the strength of pre-copulatory sexual selection decreases with increasing predation risk because the sexual traits attract predators. However, post-copulatory sexual traits which are often inconspicuous may not be influenced by predation risk. Post-copulatory behaviour of Japanese pygmy squid collected from two populations experiencing different predation levels were investigated under experimental predator presence/absence conditions. Among low predations, individual sperm rejection by females (a post-copulatory trait) was suppressed in the presence of a predator. In contrast, individuals from the high predation population reported no change in sperm rejection. As with pre-copulatory sexual selection, post-copulatory female choice was suppressed by predator presence among individuals from a low predation. However, post-copulatory female choice was not affected by predator presence among individuals from the high-predation population. This may indicate predation-driven adaptive differences and plastic responses in post-copulatory traits.
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日本侏儒鱿鱼 Idiosepius paradoxus 生殖性状和亲子关系的季节性变化
影响因子：
2.5
作者：
Noriyosi Sato
通讯作者：
Noriyosi Sato
DOI：
10.1098/rspb.2009.2017
发表时间：
2010-06
期刊：
Proceedings of the Royal Society B: Biological Sciences
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DOI：
10.1636/s03-59
发表时间：
2005
期刊：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
0.9
作者：
Karino, K;Kuwamura, T;Sakai, Y
通讯作者：
Sakai, Y