Temperature variations affect postcopulatory but not precopulatory sexual selection in the cigarette beetle
Temperature variations affect postcopulatory but not precopulatory sexual selection in the cigarette beetle
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DOI：
10.1016/j.anbehav.2018.08.010
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发表时间：
2018-10
期刊：
影响因子：
2.5
通讯作者：
Yû Suzaki;Satoko Kodera;Haruhi Fujiwara;R. Sasaki;K. Okada;Masako Katsuki
中科院分区：
文献类型：
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作者：
Yû Suzaki;Satoko Kodera;Haruhi Fujiwara;R. Sasaki;K. Okada;Masako Katsuki
环境温度在年份、季节和日期等多个时间尺度上变化，并影响变温动物的许多繁殖特征。因此，性选择的方向和强度应该受到热条件的影响。然而，交配过程中温度变化的影响有时被忽视。我们使用三种热交配条件：19°C、25°C 和 31°C 评估了与卷烟甲虫交配前和交配后性选择相关的性状。热条件不影响交配前特征（交配率、交配潜伏期和求偶强度）。交配持续时间随着温度的降低而增加，而转移的精子数量和雌性的繁殖力在 25°C 时最高。为了研究这些温度差异是否影响精子竞争的风险（再交配率）和两性的健康后果，我们使用黑色突变体进行了双重交配实验。与拒绝再交配的雌性相比，在低温或高温下首次交配的雌性更有可能接受再交配并表现出更高的繁殖力；当雌性再次交配时，第一个雄性的父子关系在 25°C 时最高。无论雌性是否接受再次交配，第一次交配时的热条件都会影响两性的健康结果。雌性再交配事件中温度条件的变化不会导致雌性再交配率或繁殖力出现差异；然而，在中间温度下，二配偶的亲子关系最高，这可能是由于低温和高温下精子转移减少所致。我们的结果表明，交配期间的温度条件会影响 L 的交配后过程。 塞里科恩。特别是，当雌性在极端温度下首次交配时，一妻多夫制得到促进，通过增加精子竞争的可能性和强度，可能有利于具有较高精子竞争能力的雄性。
The ambient temperature varies on several timescales such as year, season and day and affects many reproductive traits of ectotherms. Thus, the direction and intensity of sexual selection should be affected by thermal conditions. However, the effects of temperature variation during mating events have sometimes been overlooked. We assessed traits associated with pre- and postcopulatory sexual selection in the cigarette beetle,Lasioderma serricorne, using three thermal mating conditions: 19 °C, 25 °C and 31 °C. Thermal conditions did not affect precopulatory traits (mating rate, mating latency and courtship intensity). Mating duration increased with decreasing temperature, whereas the number of sperm transferred and female fecundity were greatest at 25 °C. To investigate whether these thermal differences affected the risk of sperm competition (remating rate) and fitness consequences for both sexes, we conducted double-mating experiments using a black colour mutant. Females that had first mated at low or high temperatures were more likely to accept remating and exhibited higher fecundity compared to females that rejected remating; when females remated, the paternity of the first male was highest at 25 °C. Thermal conditions at the first mating event affected the fitness consequences for both sexes, irrespective of the females’ remating acceptance. Changes to the thermal conditions for the female remating event caused no difference in the female remating rate or fecundity; however, the paternity of the second mate was highest at the intermediate temperature, and this could be attributed to the decreased sperm transfer at low and high temperatures. Our results suggest that temperature conditions during mating affect postcopulatory processes inL. serricorne. In particular, when females first mated at extreme temperatures, polyandry was promoted, potentially favouring males with higher sperm competitive ability through increased likelihood and intensity of sperm competition.