Sex-specific thermal constraints on fiddler crab behavior
Sex-specific thermal constraints on fiddler crab behavior
复制标题
招潮蟹行为的性别特异性热限制
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
P. Munguia
中科院分区：
文献类型：
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作者：
M. Darnell;Kevin Fowler;P. Munguia
通过耐力竞争进行的性选择有利于增加繁殖地的保有期，但成本可能很高。在这里，我们研究了招潮蟹耐力竞争的热限制，招潮蟹由于仪式化的交配行为和极端的性二态性而非常适合研究性选择和自然选择之间的相互作用。雄性招潮蟹在热应激高的潮间带繁殖区展示。退回洞穴是一种有效的体温调节机制，需要停止求偶行为。我们预测雄性应该比雌性在水面上花费更多的时间，并且他们这样做的能力应该随着体温的升高而降低。相比之下，雌性在水面上花费的时间应该很少受体温的影响。我们通过控制招潮蟹 Uca panacea 的体温并监测繁殖季节大型室外水箱的表面活动和栖息地选择来测试这些预测。雄性表现出始终高于雌性的表面活性。体温对表面活动的影响是性别特异性的，发生在雄性中，但不发生在雌性中，表明性别特异性对表面行为的热限制，并支持我们假设的对耐力竞争的热限制。
Sexual selection via endurance rivalry favors increased tenure at the breeding site but can be costly. Here, we investigated thermal constraints on endurance rivalry in fiddler crabs, a group well suited for studies of interactions between sexual and natural selection due to ritualized mating behaviors and extreme sexual dimorphism. Fiddler crab males display in thermally stressful high-intertidal breeding areas. Retreating into burrows, an effective thermoregulatory mechanism, requires a cessation of courtship behaviors. We predicted that males should spend more time on the surface than females and that their ability to do so should decrease with increasing body temperature. In contrast, the amount of time females spend on the surface should be little affected by body temperature. We tested these predictions in the fiddler crab Uca panacea by manipulating body temperatures and monitoring surface activity and habitat choice in large outdoor tanks during the breeding season. Males showed consistently higher surface activity than females. Effects of body temperature on surface activity were sex-specific, occurring in males but not in females, indicating sex-specific thermal constraints on surface behavior and supporting our hypothesized thermal constraints on endurance rivalry.