The female Euscepes postfasciatus refactory period is induced by the male but length is determined by the female.
The female Euscepes postfasciatus refactory period is induced by the male but length is determined by the female.
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雌性Euscepes postfasciatus不应期是由雄性诱导的，但长度由雌性决定。
DOI：
10.1016/j.jinsphys.2022.104427
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发表时间：
2022
影响因子：
2.2
通讯作者：
Kumano N.
中科院分区：
文献类型：
--
作者：
Hiimuro C.;Honma A.;Ikegawa Y.;Kumano N.
许多动物的雌性在其一生中多次交配（即，一妻多夫制）。交配间隔（mating interval）被称为不应期（RP）。在西印度甘薯象鼻虫（Euscepes postfasciatus）中，雄性使用射精来诱导雌性的RP以防止再次交配。通过测量RP，观察到1-49天的较大变化。这种变化可能是由于男性（射精量和质量）和女性（射精敏感性/降解能力和身体大小）及其相互作用，但确切的机制目前尚不清楚。在这里，我们调查了一个特定的女性RP的持续时间和相关性状的男性和女性的趋势，以测试以下三个因素负责的RP的长度变化：男性操纵射精量，男性射精物质的个体差异，和射精的敏感性/降解能力的女性。我们准备了处女的雄性和雌性来创造交配对。第二天，将另一只配偶介绍给雌性，并测量第一只RP。使用相同的程序测量第二个RP。还向雄性动物提供另一只雌性动物（第二只雌性动物），交配，然后测量第二只雌性动物的RP。此外，RP的长度和女性健身之间的关系进行了研究。结果表明，病灶雌虫的第一次和第二次RP之间存在显著正相关，而同一雄虫诱发的第一次和第二次RP之间无显著相关性。研究还发现，RP的长度不影响女性健身。这表明，男性并没有适应性地操纵射精量取决于女性的质量，和RP的长度的变化可以解释为女性的生理能力对射精的变化。
Females of many animals mate multiple times during their lives (i.e., polyandry). The period between matings (mating interval) is called the refractory period (RP). In the West Indian sweet potato weevil (Euscepes postfasciatus), males use the ejaculate to induce the RP in females to prevent re-mating. By measuring the RP, a large variation of 1–49 days was observed. This variation may be due to the males (ejaculate quantity and quality) and females (ejaculate sensitivity/degradation ability and body size) and their interactions, but the exact mechanisms are currently unclear. Here, we investigated a tendency towards a particular female RP duration and the associated traits of males and females to test the following three factors responsible for variation in the length of the RP: male manipulation of ejaculate volume, individual differences in male ejaculation substances, and ejaculate sensitivity/degradation ability in females. We prepared virgin males and females to create mating pairs. The following day, another mate was introduced to the females, and the first RP was measured. The same procedure was used for measuring the second RP. The males were also provided with another female (second female), mated, and then the RP of the second female was measured. In addition, the relationship between the length of the RP and female fitness was investigated. The results showed that there was a significant positive correlation between the first and second RP in the focal females, while no significant correlation was observed between the RP of the first and second females induced by the same male. It was also found that the length of the RP did not affect female fitness. This indicated that the males did not adaptively manipulate ejaculation volume depending on the quality of the females, and variance in the length of the RP may be explained by variation in the female physiological ability against ejaculate.