Female chorus frogs delay mate choice under suboptimal environmental conditions
Female chorus frogs delay mate choice under suboptimal environmental conditions
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DOI：
10.1016/j.anbehav.2023.11.012
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发表时间：
2024-02-15
期刊：
影响因子：
2.5
通讯作者：
Lemmon，Emily Moriarty
中科院分区：
文献类型：
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作者：
Dye，Mysia;Lemmon，Alan R.;Lemmon，Emily Moriarty
亮点温度不影响山地合唱青蛙的物种识别。雌性在低温下做出选择的时间是雌性的两倍。当刺激不熟悉时，雌性花费两倍的时间做出选择。信号辨别不会随着信号范围和温度的变化而改变。许多对生殖隔离很重要的特征都是环境反应的。然而，大多数研究生殖隔离的研究并没有明确考虑环境的变化。温度对生殖行为有特别大的影响，特别是在体温外的动物中。在这里，我们测试了温度是否影响陆地合唱青蛙和它的同源种黑线蛙之间的生殖隔离程度。这两个物种在自然界中进行昂贵的杂交，导致雄性信号的强化和雌性在共生中的偏好。然而，雄性的广告叫声随着温度的变化而变化，因此两个物种的广告叫声在寒冷的温度下比在温暖的温度下的差异更小。为了研究温度对该系统生殖隔离的影响，我们以同域雌性马尾松为材料，进行了6个二元选择偏好试验。在这些实验中，我们让雌性适应温暖(20摄氏度)或凉爽(10摄氏度)的温度，并让它们在异种和同种之间做出选择，以适应这种温度。我们还进行了实验，让雌性在温暖的温度下选择更相似的刺激，以测试雌性在寒冷的温度下是否有更狭隘的偏好。我们发现，无论温度或信号相似性如何，女性总是对同种特定的广告呼叫有显著的偏好。然而，在条件不佳的情况下，女性需要两倍的时间才能做出选择。这种时间延迟可能会导致杂交风险增加，尽管雌性有辨别叫声的能力。我们的结果强调了在检查与生殖隔离有关的特征时考虑环境背景的重要性。
HighlightsTemperature did not affect species recognition in upland chorus frogs.Females took twice as long to make a choice at low temperatures.Females took twice as long to make a choice when stimuli were unfamiliar.Signal discrimination did not change across signal range and temperature.Many traits important for reproductive isolation are environmentally responsive. However, most studies examining reproductive isolation do not explicitly take into consideration environmental variation. Temperature can have a particularly large effect on reproductive behaviours, especially in ectotherms. Here, we tested whether temperature affects the degree of reproductive isolation between the upland chorus frog, Pseudacris feriarum, and its congener Pseudacris nigrita. These two species engage in costly hybridization in nature, leading to reinforcement of male signals and female preferences in sympatry. However, male advertisement calls vary with temperature such that the difference between the advertisement calls of the two species is narrower at cold temperatures than at warm temperatures. To examine the effect of temperature on reproductive isolation in this system, we performed six binary choice preference trials using sympatric female P. feriarum. In these experiments, we acclimated females to either warm (20 C) or cool (10 C) temperatures and gave them a choice between heterospecific and conspecific advertisement calls appropriate for the temperature. We also conducted experiments where we gave females a choice between more similar stimuli at warm temperatures to test whether females have narrower preferences at cold temperatures. We found that females always had a significant preference for the conspecific advertisement call, regardless of temperature or signal similarity. However, females took twice as long to make a choice in suboptimal conditions. This time delay may lead to increased risk of hybridization, despite females’ ability to discriminate between calls. Our results highlight the importance of considering environmental context when examining traits involved in reproductive isolation.