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摘要 : 2017年6月12日,国际学术权威刊物自然出版集团旗下子刊《Nature Ecology & Evolution》杂志在线发表了瑞典乌普萨拉大学David Wheatcroft研究员的一篇研究论文,论文报道了有关两种姬鹟属鸟的新研究,论文揭示鸣禽在幼年时期就能分辨不同的鸟鸣的能力是由基因决定的。

2017年6月12日,国际学术权威刊物自然出版集团旗下子刊《Nature Ecology & Evolution》杂志在线发表了瑞典乌普萨拉大学David Wheatcroft研究员的一篇研究论文,论文报道了有关两种姬鹟属鸟的新研究,论文揭示鸣禽在幼年时期就能分辨不同的鸟鸣的能力是由基因决定的。


David Wheatcroft和Anna Qvarnstrm交换了斑姬鹟和白领姬鹟窝里的鸟蛋(这两种鸟栖息于波罗的海上的厄兰岛)。研究发现,这些雏鸟虽然由另一种鸟养大,但却对同类的鸣叫声反应更强烈。这表明早期的鸟鸣分辨能力并不依赖于早期的鸟鸣体验。之后,研究人员让这两种鸟杂交,发现杂交产生的雏鸟无论其母亲属于哪个物种,都会对斑姬鹟的鸟鸣声反应更强烈。这表明早期的鸟鸣分辨能力是由基因决定的,而且不受母鸟种类的强烈影响。



Genetic divergence of early song discrimination between two young songbird species


Juvenile songbirds express species-specific song discrimination from an early age, which focuses learning onto the songs of their parental species. However, it remains unknown whether this early song discrimination is influenced by early social experience or maternal effects or whether it is instead largely genetically determined. We manipulated early social experience by swapping young embryos between the nests of two co-occurring songbird species—pied and collared flycatchers. We show that nestlings are more active in response to playbacks of conspecific songs, even when raised by adults from the other species, thus enabling us to reject social experience as the main determinant of early song discrimination. We then crossed the two species in captivity and showed that the song responses of hybrid nestlings do not depend on social experience or maternal species, implying genetic divergence of early song discrimination. Our results provide conclusive evidence that early song discrimination has a largely genetic component, which can stabilize reproductive isolation by reducing song learning across closely related species.

来源: Nature Ecology & Evolution 浏览次数:0


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