Experimental analysis of the effect of genital morphology on insemination success in the ground beetle Carabus insulicola (Coleoptera Carabidae)
Experimental analysis of the effect of genital morphology on insemination success in the ground beetle Carabus insulicola (Coleoptera Carabidae)
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地甲虫 Carabus insulicola（鞘翅目 Carabidae）生殖器形态对授精成功影响的实验分析
DOI：
10.1080/08927014.2003.9522690
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发表时间：
2003
影响因子：
1.2
通讯作者：
Y. Takami
中科院分区：
文献类型：
--
作者：
Y. Takami
以地甲虫Carabus insulicola为研究对象，验证了雄性昆虫精致的生殖器官有助于提高受精成功率的假设。为了增强生殖器大小的变异，实验雄虫的生殖器钩被切断，然后这些雄虫与处女雌虫交配。Logistic回归分析表明，雄性生殖钩的长度对授精成功率有影响。生殖钩较短的雄鱼往往不能将精囊沉积在合适的位置，也不能将精子转移到精囊中。因此，雄性生殖器钩通过在精子可能被转移的部位放置精子包囊来增加人工授精的成功率。交配持续时间和交配后的保护也可以用这些决定因素来解释。逐步回归表明，射精的发生和精包的位置分别决定了交配的持续时间和交配后的守卫时间。
The hypothesis that the elaborated genitalia of male insects serve to improve insemination success were tested using the ground beetle Carabus insulicola. To enhance variation in genital size, the genital hooks of experimental males were cut, and these males were then mated with virgin females. Logistic regression showed that the length of the male genital hook affected insemination success. Males with a shorter genital hook tended not to deposit spermatophores at the proper site, and failed to transfer sperm into the spermatheca. Therefore, the male genital hook serves to increase insemination success by depositing a spermatophore at the site where sperm are likely to be transferred. The duration of copulation and post-copulatory guarding may also be explained by these determinants. Stepwise regressions indicated that the occurrence of ejaculation, and the location of the spermatophore determined the duration of copulation and post-copulatory guarding, respectively.