Transition from monogyny to polygyny in Nephila senegalensis (Araneae: Nephilidae) is not accompanied by increased investment in sperm
Transition from monogyny to polygyny in Nephila senegalensis (Araneae: Nephilidae) is not accompanied by increased investment in sperm
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塞内加尔新蜘蛛（蜘蛛亚科：蜘蛛科）从一夫一妻制向一夫多妻制的转变并没有伴随着精子投入的增加
DOI：
10.1111/bij.12863
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发表时间：
2016
影响因子：
1.9
通讯作者：
P. Michalik
中科院分区：
文献类型：
--
作者：
Preik O;Schneider J.M;Uhl G. ;P. Michalik
一个常见的男性适应，以防止精子竞争是放置交配插头。如果这种插塞构成生殖系统的一部分并使男性不育，则被认为是一种极端投资。生殖器切割发生在几个家庭的一夫一妻制蜘蛛中，可能与永久性精子耗竭同时发生，这意味着一旦雄性成熟，精子生产就会终止。在圆网蜘蛛属内，单雌交配策略被认为是祖先的，尽管有些物种已经恢复到一夫多妻的交配策略。虽然生殖器切割不会发生在这些物种中，但永久性精子耗竭（PSD）仍然存在。我们比较了一种有效堵塞的物种（有窗肾形菌Thorell，1859）和一种密切相关的非堵塞物种[塞内加尔肾形菌（Walckenaer，1841）]对精子的投资。N组的精子投入量较高。senegalensis的原因是雄性能够与多个雌性交配，而N.有窗的雄性最多只能与同一雌性交配两次。N.塞内加尔人和无法通过交配栓独占雌性导致精子竞争的风险更高。因此，我们预测，在精子生产组织和更大的精子储存器官的男性N。senegalensis与N.有窗的我们研究了这两个物种的睾丸和输精管的大小和细胞质量的差异，使用光学和透射电子显微镜和分析的男性交配器官（即spermophor）的精子库的体积，使用X射线显微计算机断层扫描。与我们的预测相反，N. senegalensis雄性显著小于N.有窗的
A common male adaptation to prevent sperm competition is the placement of a mating plug. Such plugs are considered as an extreme investment if they comprise parts of the genital systems and render the male sterile. Genital mutilation occurs in monogynous spiders of several families and may co-occur with permanent sperm depletion, meaning that sperm production is terminated once males become mature. Within the orb-web spider genus Nephila, monogynous mating strategies are considered ancestral, although some species have reverted to a polygynous mating strategy. Although genital mutilation does not occur in these species, permanent sperm depletion (PSD) remained. We compared investment in sperm between an effectively plugging (Nephila fenestrata Thorell, 1859) and a closely-related nonplugging species [Nephila senegalensis (Walckenaer, 1841)]. Sperm investment should be higher in N. senegalensis because males are able to mate with several females, whereas N. fenestrata males can only achieve a maximum of two copulations, generally performed with the same female. The absence of a plugging mechanism in N. senegalensis and the inability to monopolize females by means of mating plugs results in a higher risk of sperm competition. Thus, we predicted higher investment in sperm producing tissue and larger sperm storage organs in males of N. senegalensis compared to N. fenestrata. We examined the testes and deferent ducts of both species for size and cell-quality differences using light and transmission electron microscopy and analyzed the volume of the sperm reservoir in the male copulatory organ (ie spermophor) using X-ray microcomputed tomography. In contrast to our prediction, the lumen of testes, deferent ducts, and spermophor of N. senegalensis males were significantly smaller than in N. fenestrata.
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影响因子：
2.4
作者：
Fromhage, L;Schneider, JM
通讯作者：
Schneider, JM
影响因子：
1.9
作者：
Friesen, Christopher R.;Shine, Richard;Mason, Robert T.
通讯作者：
Mason, Robert T.
影响因子：
3.7
作者：
Hayward A;Gillooly JF
通讯作者：
Gillooly JF
DOI：
10.1111/j.0014-3820.2005.tb01790.x
发表时间：
2005-07
期刊：
--
影响因子：
--
作者：
L. Fromhage;M. Elgar;J. Schneider
通讯作者：
L. Fromhage;M. Elgar;J. Schneider
影响因子：
3.3
作者：
Fromhage, Lutz
通讯作者：
Fromhage, Lutz