Factors affecting sperm quality before and after mating of calopterygid damselflies.
Factors affecting sperm quality before and after mating of calopterygid damselflies.
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DOI：
10.1371/journal.pone.0009904
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发表时间：
2010-03-26
期刊：
影响因子：
3.7
通讯作者：
Hayashi F
中科院分区：
文献类型：
--
作者：
Tsuchiya K;Hayashi F
蜻蜓(蜻蜓目：齐翅目)比其他体内射精的昆虫拥有更复杂的精子转移系统。雄性将精子从内部生殖器官转移到特定的精囊，即身体表面的一个小腔，然后将它们转移到雌性体内。为了研究精子转移的额外步骤是如何导致精子质量下降的，我们评估了两个蜻蜓物种Mnais pruinosa和Calopteryx Cornelia在交配的每个阶段以及在雄性和雌性生殖器官中不同储存时间后的精子活力(活精子的比例)。即使在交配后不久，雌性储存的精子的活力也低于雄性储存的精子。男性精子囊不具备比内部生殖器官更长时间保持精子质量的设备。然而，精子囊只用于短期储存；因此，这一过程似乎不太可能降低精子在转移到雌性体内时的存活率。雄性在转移自己的射精液之前会先移除竞争对手的精子，但雄性精子的移除并不总是完全的。因此，新收到的精子和已经储存在雌性体内的老化精子之间会发生稀释，导致雌性体内的精子活力低于男性转移的精子。如果雌性不再交配，精子的存活率会随着保存时间的延长而逐渐降低。因此，雌性的频繁交配可能有助于维持高精子质量。
Damselflies (Odonata: Zygoptera) have a more complex sperm transfer system than other internally ejaculating insects. Males translocate sperm from the internal reproductive organs to the specific sperm vesicles, a small cavity on the body surface, and then transfer them into the female. To examine how the additional steps of sperm transfer contribute to decreases in sperm quality, we assessed sperm viability (the proportion of live sperm) at each stage of mating and after different storage times in male and female reproductive organs in two damselfly species, Mnais pruinosa and Calopteryx cornelia. Viability of stored sperm in females was lower than that of male stores even just after copulation. Male sperm vesicles were not equipped to maintain sperm quality for longer periods than the internal reproductive organs. However, the sperm vesicles were only used for short-term storage; therefore, this process appeared unlikely to reduce sperm viability when transferred to the female. Males remove rival sperm prior to transfer of their own ejaculate using a peculiar-shaped aedeagus, but sperm removal by males is not always complete. Thus, dilution occurs between newly received sperm and aged sperm already stored in the female, causing lower viability of sperm inside the female than that of sperm transferred by males. If females do not remate, sperm viability gradually decreases with the duration of storage. Frequent mating of females may therefore contribute to the maintenance of high sperm quality.
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影响因子：
2.4
作者：
Jones, Theresa M.;Featherston, Rebecca;Elgar, Mark A.
通讯作者：
Elgar, Mark A.
影响因子：
2.3
作者：
SIVAJOTHY, MT;TSUBAKI, Y
通讯作者：
TSUBAKI, Y
DOI：
10.1098/rspb.1995.0046
发表时间：
1995-03-22
影响因子：
4.7
作者：
SIVAJOTHY, MT;HOOPER, RE
通讯作者：
HOOPER, RE
影响因子：
2.1
作者：
Córdoba-Aguilar, A
通讯作者：
Córdoba-Aguilar, A
影响因子：
1.5
作者：
Damiens, D;Bressac, C;Chevrier, C
通讯作者：
Chevrier, C