Conspecific olfactory preferences and interspecific divergence in odor cues in a chickadee hybrid zone
Conspecific olfactory preferences and interspecific divergence in odor cues in a chickadee hybrid zone
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DOI：
10.1002/ece3.5497
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发表时间：
2019-08
影响因子：
2.6
通讯作者：
Alex Van Huynh;A. M. Rice
中科院分区：
文献类型：
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作者：
Alex Van Huynh;A. M. Rice
了解交配线索如何促进二次接触后的生殖隔离，对于描述动物物种形成过程具有重要意义。不同的化学线索已被证明在许多动物类群的生殖隔离中起作用。然而，这些线索在鸟类物种中被忽视了，特别是在雀形目动物中，人们倾向于更传统的信号，如歌声和羽毛。在这里，我们的目标是测试气味作为配偶选择线索的潜力，从而有助于在宾夕法尼亚州东部杂交区种群中黑冠山雀（Poecile atricapillus）和卡罗莱纳山雀（P. carolinensis）之间的早熟生殖隔离。使用气相色谱-质谱法，我们记录了尿尿腺油化学的显著物种差异，特别是在酯类化合物与非酯类化合物的比例方面。我们还发现，使用Y迷宫设计，野生山雀对同种气味的偏好明显高于异种气味。我们的研究结果表明，在这些山雀中，气味可能是一个被忽视但重要的交配线索，可能会促进早熟的生殖隔离。我们进一步讨论了未来研究鸣禽嗅觉交流和物种形成的几个有前途的途径。
Abstract Understanding how mating cues promote reproductive isolation upon secondary contact is important in describing the speciation process in animals. Divergent chemical cues have been shown to act in reproductive isolation across many animal taxa. However, such cues have been overlooked in avian speciation, particularly in passerines, in favor of more traditional signals such as song and plumage. Here, we aim to test the potential for odor to act as a mate choice cue, and therefore contribute to premating reproductive isolation between the black‐capped (Poecile atricapillus) and Carolina chickadee (P. carolinensis) in eastern Pennsylvania hybrid zone populations. Using gas chromatography–mass spectrometry, we document significant species differences in uropygial gland oil chemistry, especially in the ratio of ester to nonester compounds. We also show significant preferences for conspecific over heterospecific odor cues in wild chickadees using a Y‐maze design. Our results suggest that odor may be an overlooked but important mating cue in these chickadees, potentially promoting premating reproductive isolation. We further discuss several promising avenues for future research in songbird olfactory communication and speciation.