Logue David M, Hall Michelle L
Departamento de Biología, Universidad de Puerto Rico, , PO Box 9000, Mayagüez PR 00681-9000, Puerto Rico, Department of Zoology, University of Melbourne, , Melbourne, Victoria 3010, Australia.
Proc Biol Sci. 2014 Mar 11;281(1782):20140103. doi: 10.1098/rspb.2014.0103. Print 2014 May 7.
Many groups of animals defend shared resources with coordinated signals. The best-studied of these signals are the vocal duets produced by mated pairs of birds. Duets are believed to be more common among tropical-breeding species, but a comprehensive test of this hypothesis is lacking, and the mechanisms that generate latitudinal patterns in duetting are not known. We used a stratified sample of 372 songbird species to conduct the first broad-scale, phylogenetically explicit analysis of duet evolution. We found that duetting evolves in association with the absence of migration, but not with sexual monochromatism or tropical breeding. We conclude that the evolution of migration exerts a major influence on the evolution of duetting. The perceived association between tropical breeding and duetting may be a by-product of the migration-duetting relationship. Migration reduces the average duration of partnerships, potentially reducing the benefits of cooperative behaviour, including duetting. Ultimately, the evolution of coordinated resource-defence signals in songbirds may be driven by ecological conditions that favour sedentary lifestyles and social stability.
许多动物群体通过协调信号来保卫共享资源。其中研究得最透彻的信号是鸟类配偶发出的声乐二重唱。二重唱在热带繁殖物种中被认为更为常见，但缺乏对这一假设的全面检验，而且产生二重唱纬度模式的机制尚不清楚。我们使用了372种鸣禽的分层样本，对二重唱进化进行了首次大规模、系统发育明确的分析。我们发现，二重唱的进化与不迁徙有关，但与性别单态性或热带繁殖无关。我们得出结论，迁徙的进化对二重唱的进化有重大影响。热带繁殖与二重唱之间的明显关联可能是迁徙 - 二重唱关系的一个副产品。迁徙缩短了伴侣关系的平均持续时间，可能会减少包括二重唱在内的合作行为的益处。最终，鸣禽中协调资源防御信号的进化可能是由有利于定居生活方式和社会稳定的生态条件驱动的。
