Male copulatory sensory stimulation induces female ejection of rival sperm in a damselfly
Male copulatory sensory stimulation induces female ejection of rival sperm in a damselfly
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DOI：
10.1098/rspb.1999.0705
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发表时间：
1999-04-22
影响因子：
4.7
通讯作者：
Córdoba-Aguilar, A
中科院分区：
文献类型：
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作者：
Córdoba-Aguilar, A
雄性豆娘拥有非常特化的生殖器。雌性交配繁殖并将精子储存在两个精子储存器官中，即交配囊和受精囊。在交配过程中，雄性使用其生殖器物理去除储存在这些器官中的精子。我记录了一种新的机制，雄性可以通过这种机制进入 Calopteryx haemorrhoidalis asturica 的受精囊。该机制基于雄性对控制卵子受精和产蛋的雌性感觉系统的刺激。在交配过程中，阳茎（间接参与精子转移的男性生殖器结构）使女性生殖道中承载机械感受器的角质板变形。这种刺激导致精子从受精囊射出。阳茎宽度与射出的精子量呈正相关。我认为男性利用了女性先前存在的感官偏见来获得身体上无法接触到的精子。这些结果揭示了当前性选择模型中女性偏好的起源问题以及生殖器通过性选择的进化。据推测，雌性可能会利用这一过程作为基于雄性生殖器的交配后性选择的一种形式。
Male damselflies possess very specialized genitalia. Females mate multiply and store sperm in two sperm storage organs, the bursa copulatrix and the spermatheca. During copulation, males physically remove the sperm stored in these organs using their genitalia. I document a novel mechanism by which males gain access to the spermatheca in Calopteryx haemorrhoidalis asturica. The mechanism is based on male stimulation of the female sensory system that controls egg fertilization and laying. During copulation, the aedeagus (a male genitalic structure indirectly involved in sperm transfer) distorts the cuticular plates in the female genital tract that bear mechanoreceptive sensilla. This stimulation results in sperm ejection from the spermatheca. Aedeagus width is positively correlated with the amount of sperm ejected. I propose that males have exploited a pre-existing female sensory bias to gain access to otherwise physically unreachable sperm. These results shed light on the issue of the origin of female preferences in current models of sexual selection and on the evolution of genitalia via sexual selection. It is postulated that females might use this process as a form of post-copulatory sexual selection on the basis of males' genitalia.