Female Pygmy Squid Cryptically Favour Small Males and Fast Copulation as Observed by Removal of Spermatangia
Female Pygmy Squid Cryptically Favour Small Males and Fast Copulation as Observed by Removal of Spermatangia
复制标题
通过去除精囊观察到雌性侏儒乌贼神秘地偏爱体型较小的雄性乌贼并进行快速交配
DOI：
10.1007/s11692-013-9261-4
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发表时间：
2014
影响因子：
2.5
通讯作者：
H. Munehara
中科院分区：
文献类型：
--
作者：
Noriyosi Sato;T. Kasugai;H. Munehara
雌性在交配后可以表达对配偶（或受精）的偏好。在日本侏儒乌贼（Idiosepius paradoxus）中，雄性在交配前没有任何明显的表现，雌性在交配后会去除附着在身体上的精囊。在这项研究中，我们观察了交配前和交配后的行为，并分析了哪些与交配相关的变量与精囊切除相关。当雌性与较大的雄性交配或交配持续时间较长时，雌性鱿鱼在交配后会延长其口腔肿块，并去除更多的精子。我们还研究了精管切除对保留精管的影响，以预测隐雌选择（CFC）是否影响受精成功。雌性切除精管对保留精管数量的影响大于雄性射精管数量的影响。这些结果表明，日本侏儒乌贼交配后通过口腔质量延长去除精囊是一种CFC，雌性暗地倾向于小雄性和快速交配。
Females can express mate (or fertilisation) preferences after copulation. In the Japanese pygmy squid,Idiosepius paradoxus, in which males do not show any conspicuous pre-copulatory displays, the females remove the spermatangia attached to their bodies after copulation. In this study, we observed pre- and post-copulatory behaviours and analysed which variables associated with copulation were correlated with spermatangia removal. When females mated with larger males or copulation lasted longer female squid elongated their buccal mass after copulation and removed more spermatangia. We also investigated the effects of spermatangia removal on the retained spermatangia to predict whether cryptic female choice (CFC) influenced fertilisation success. Spermatangia removal by females had a stronger effect on the number of spermatangia retained than did the number of spermatangia ejaculated by males. These results suggest that spermatangia removal after copulation by buccal mass elongation works as a CFC in Japanese pygmy squid, and females cryptically favoured small males and fast copulation.