Rapid evolution of a novel song and an increase in repertoire size in an island population of an Australian songbird
Rapid evolution of a novel song and an increase in repertoire size in an island population of an Australian songbird
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DOI：
10.1046/j.1474-919x.2003.00190.x
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发表时间：
2003-07-01
期刊：
影响因子：
2.1
通讯作者：
Baker, EM
中科院分区：
文献类型：
--
作者：
Baker, MC;Baker, MSA;Baker, EM
文化创新在动物身上是常见的，但新奇特征的发展时间通常是未知的。我们在这里报告了一种新的鸣声类型，它出现在西澳大利亚州一个离岸岛屿上的鸟类种群中，在那里，西老花岛的殖民时间是已知的。在大陆，一首歌的类型很普遍。在罗特内斯特岛，许多人唱一种不同类型的歌曲，一些人拥有两种歌曲类型的曲目：与大陆共享的标准歌曲和邻近大陆没有的新歌类型。在罗特尼斯特上发现的新奇歌曲类型在句法结构上是如此不同，以至于人们很容易将其误认为是新物种的歌曲。大陆鸟类特有的歌声在歌声中的音符发出的频率上是不规律的。罗特内斯特的这首新歌具有高度结构化的句法，音符以严格和重复的频率序列传递，从而产生有节奏的音乐声音。据了解，该物种大约在1955年殖民了罗特尼斯特。在过去的50年里，随着文化的演变，新的歌曲类型显然发展迅速。
Cultural innovations are commonly noted in animals, but times of development of novel traits are usually unknown. We report here a novel song type arising in a bird population on an offshore island of Western Australia where the time of colonization of the island by the Western Gerygone Gerygone fusca is known. On the mainland, a single song type is widespread. On Rottnest Island, many individuals sing a different type of song and a number possess a repertoire of two song types: the standard song shared with the mainland and the novel song type not found on the neighbouring mainland. The novel song type found on Rottnest is so different in its syntactical structure that one could easily mistake it for that of a new species. The characteristic song of mainland birds is irregular in the frequencies at which the notes within a song are delivered. The novel song on Rottnest has a highly structured syntax with notes delivered at a strict and repeated sequence of frequencies resulting in a rhythmic musical sound. The species is known to have colonized Rottnest in about 1955. The new song type apparently developed rapidly by cultural evolution in the last 50 years.