Imperfect nestling-mimicry attracts high-quality females in the Asian barn swallow
Imperfect nestling-mimicry attracts high-quality females in the Asian barn swallow
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不完美的雏鸟模仿行为吸引了亚洲家燕的高品质雌性
DOI：
10.1080/03949370.2018.1451920
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
E
中科院分区：
文献类型：
--
作者：
Hasegawa;M. and Arai;E
感觉陷阱假说预测，雄性信号会模仿雌性在其他情况下做出反应的刺激，但这些信号可能不会引起所有雌性的同等反应。雌性家燕会被雄性的诱惑叫声所吸引，尤其是高音调的叫声，在很大程度上类似于雏鸟乞食的叫声。然而，雄性的诱惑叫声仍然与雏鸟乞食的叫声有所区别，这表明“模仿不完美”。鉴于雏鸟般的叫声能有效地吸引雌性，目前尚不清楚为什么完美模仿会被阻止。在这里，我们使用亚洲亚种（H. r. gutturalis），研究了雌性在交配期间对雄性诱惑叫声和雏鸟乞食叫声的偏好，与她前任配偶的装饰和试验日期（雌性到达日期的代表）相关，在这个实验中，期望雌性根据这些变量改变它们的反应。我们发现，相对于雏鸟乞食叫声的播放，雌性对播放雄性诱惑叫声的反应随着前任配偶羽毛颜色的增加而增加，并随着试验日期的增加（因此迟到）而减少。这种观察结果是可以预见的，因为色彩鲜艳的雄性会发出低音调的，即不太像雏鸟的诱惑叫声，而且因为早到的雌性（经验丰富的雌性）会比其他雌性具有更高的辨别能力。对雏鸟乞食叫声的不完美模仿会吸引相对高质量的雌性，因此雄性不应发出与雏鸟乞食叫声非常相似的诱惑叫声，除非没有高质量的雌性。
The sensory trap hypothesis predicts that male signals mimic stimuli to which females respond in other contexts, yet these signals may not elicit equivalent responses from all females. Female barn swallowsHirundo rusticaare attracted to male enticement calls, particularly high-pitched ones that resemble the food-begging calls of nestlings to a greater extent. However, male enticement calls are still distinguishable from nestling food-begging calls, denoting “imperfect mimicry”. It remains unknown why perfect mimicry is prevented given that nestling-like calls effectively attract females. Here, using Asian subspecies (H. r. gutturalis), we examined female preference for male enticement calls to nestling food-begging calls during the mating period in relation to the ornamentation of her previous mate and trial date, a proxy of female arrival date, in this experiment with the expectation that females vary their response depending on these variables. We found that female reaction to the playback of male enticement calls, relative to the playback of nestling food-begging calls, increased with increasing plumage coloration of her previous mate, and decreased with increasing trial date (and hence late arrival). This observation is predictable, because colorful males emit lower-pitched, i.e. less nestling-like, enticement calls, and because early-arriving females, which are more experienced females, would have higher discriminability than others. Imperfect mimicry to nestling food-begging calls would attract relatively high-quality females, and thus males should not emit enticement calls that closely resemble nestling food-begging calls except when high-quality females are not available.