Prolonged copulation and the internal dynamics of sperm transfer in the water strider Aquarius remigis
Prolonged copulation and the internal dynamics of sperm transfer in the water strider Aquarius remigis
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DOI：
10.1139/cjz-79-10-1801
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发表时间：
2001-10-01
影响因子：
1.4
通讯作者：
Fairbairn, DJ
中科院分区：
文献类型：
--
作者：
Campbell, V;Fairbairn, DJ
交配持续的时间远远超过了受精所需的时间，这在整个昆虫纲中是很常见的，但它们的适应意义仍然不清楚。我们解决的假设，长期交配有利于男性宝瓶座remigis（半翅目，Gerridae）影响精子的使用和储存后授精。我们描述了gynatial复杂的女性和文件精子的位置后立即自然终止32和25人工终止交配。我们还研究了精子储存在22个女性从男性分离2-10天。我们的研究结果表明，授精发生在交配结束时，因此，延长交配是不是一个授精后的配偶保护策略，如以前所假设的。精子以一个连贯的、盘绕的团转移，并迅速移动到受精囊，初级储存器官。然而，一些精子直接移动到受精道，因此应该能够立即受精。交配时间延长与受精囊管的填充增加有关，这可能表明雄性在延长的授精前阶段进行了某种形式的交配求偶或精子装载。我们讨论了A.在一夫多妻制的自然条件下，两性长期交配的总体成本和收益。
Copulations lasting much longer than required to effect insemination are common throughout the Insecta, but their adaptive significance remains obscure. We address the hypothesis that prolonged copulations benefit male Aquarius remigis (Hemiptera, Gerridae) by influencing sperm use and storage following insemination. We describe the gynatrial complex of females and document sperm location immediately following 32 naturally terminated and 25 artificially terminated copulations. We also examine sperm storage in 22 females isolated from males for 2-10 days. Our results demonstrate that insemination occurs at the end of copulation, and therefore that prolonged copulation is not a post-insemination mate-guarding tactic, as was previously assumed. Sperm are transferred in a coherent, coiled mass and move rapidly to the spermathecal tube, the primary storage organ. However, a few sperm move directly to the fecundation canal and hence should be capable of immediate fertilization. Prolonged copulation is associated with increased filling of the spermathecal tube, which may indicate some form of copulatory courtship or sperm loading by males during the prolonged pre-insemination phase. We discuss this new interpretation of prolonged copulation in A. remigis in the context of the overall costs and benefits of prolonged copulation for both sexes under the natural conditions of polygynandry.