Possible coevolution of male and female genital form and function in a calopterygid damselfly
Possible coevolution of male and female genital form and function in a calopterygid damselfly
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DOI：
10.1111/j.1420-9101.2004.00796.x
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发表时间：
2005-01-01
影响因子：
2.1
通讯作者：
Córdoba-Aguilar, A
中科院分区：
文献类型：
--
作者：
Córdoba-Aguilar, A
本文通过测定雌蛾Calopteryx hemorrhoidalis生殖器的功能，探讨了生殖器的进化变化。雄蛾通过阴道感受器上的表皮摩擦刺激雌蛾。水母的形态变化很大，并与受精囊射出的精子量呈正相关。有趣的是，与其他家庭成员相比，女性的感器数量显着减少。在这里，我探讨是否存在定向选择的aedeagal宽度在其进化开始，以及是否感器减少进化，使精子喷射不那么有效。利用C.雌虫中没有刺激能力和感器数量较多的雌虫为aeorrhoidalisaedeagi;雌虫中的红尾海萤（Hetaerinacruentata）和红尾海萤（C. xanthostoma，我的研究结果证实了这些假设：aedeagal宽度的变化与精子射出率呈负相关，而精子射出率在高感器数量的物种中更高。对C.痔疮是aedeagal的宽度是有利的，其次是感器减少。
In this paper some evolutionary changes of genitalia in the damselfly Calopteryx haemorrhoidalis are investigated by determining their current and past function. Calopteryx haemorrhoidalis males stimulate females by aedeagal frictioning on a set of vaginal sensilla. The aedeagus is considerably variable and positively correlates with volumes of ejected sperm from the spermatheca. Interestingly, females show a significantly reduced sensillum number compared with other family members. Here I explore whether there existed directional selection for aedeagal width at its evolutionary onset; and whether the sensillum reduction evolved to make sperm ejection less effective. Using C. haemorrhoidalis aedeagi in females whose species retained the ancestral conditions (no stimulatory ability and large sensillum numbers), Hetaerina cruentata and C. xanthostoma, my results corroborated these assumptions: variation in aedeagal width inversely correlated with sperm ejection rate while sperm ejection was higher in species with high sensillum numbers. A suggested coevolutionary interpretation of these results in C. haemorrhoidalis is that aedeagal width was favoured which was followed by a sensillum reduction.