Am Nat. 2023 Jun;201(6):851-863. doi: 10.1086/724381. Epub 2023 Apr 24.
AbstractEnvironmental temperatures potentially influence reproductive performance and sexual selection by restricting opportunities for activity. However, explicit tests of the behavioral mechanisms linking thermal variation to mating and reproductive performance are rare. We address this gap in a temperate lizard by combining social network analysis with molecular pedigree reconstruction in a large-scale thermal manipulation experiment. Populations exposed to cool thermal regimes presented fewer high-activity days compared with populations exposed to a warmer regime. While plasticity in thermal activity responses in males masked overall differences in activity levels, prolonged restriction nevertheless affected the timing and consistency of male-female interactions. Females were less capable than males of compensating for lost activity time under cold stress, and less active females in this group were significantly less likely to reproduce. While sex-biased activity suppression appeared to limit male mating rates, this did not correspond to a heightened intensity of sexual selection or shifts in the targets of sexual selection. In many populations facing thermal activity restriction, sexual selection on males may play a limited role relative to other thermal performance traits in facilitating adaptation.
摘要环境温度可能会通过限制活动机会来影响繁殖性能和性选择。然而，将温度变化与交配和繁殖性能联系起来的行为机制的明确测试很少。我们通过在大规模热处理实验中结合社会网络分析和分子谱系重建，解决了温带蜥蜴中的这一差距。与暴露在温暖环境的种群相比，暴露在凉爽环境的种群的高活动天数较少。尽管雄性的热活性反应的可塑性掩盖了活动水平的总体差异，但长期限制仍然会影响雌雄互动的时间和一致性。在寒冷压力下，雌性比雄性更难补偿失去的活动时间，而在该组中活动较少的雌性繁殖的可能性明显较低。虽然性别偏置的活动抑制似乎限制了雄性的交配率，但这并没有对应于性选择的强度增加或性选择的目标发生变化。在许多面临热活动限制的种群中，与促进适应的其他热性能特征相比，雄性的性选择可能在一定程度上发挥作用。
