Max Planck Institute for Ornithology, Andechs, Germany.
J Evol Biol. 2010 May;23(5):1050-63. doi: 10.1111/j.1420-9101.2010.01975.x. Epub 2010 Mar 22.
Migration promotes utilization of seasonal resources, and the distance flown is associated with specific morphologies, yet these relationships can be confounded by environmental factors and phylogeny. Understanding adaptations associated with migration is important: although migration patterns change rapidly, it is unclear whether migratory traits track behavioural shifts. We studied morphometrics of four stonechat populations representing a migratory gradient and raised under common-garden conditions. With multivariate analyses, we identified wing traits that differed clearly from general size trends, and used phylogenetic comparative methods to test the prediction that these traits correlated with migratory distance in captive and wild populations. Pointedness differed among populations, changed independently from overall body size, and was correlated with migration distance. Migration in stonechats may lead to deviations from allometric size changes, suggesting that birds may adapt morphologically to selection pressures created by their own behaviour in response to changing environmental conditions.
迁徙促进了对季节性资源的利用，飞行距离与特定的形态有关，但这些关系可能会受到环境因素和系统发育的干扰。了解与迁徙相关的适应是很重要的：尽管迁徙模式变化迅速，但还不清楚迁徙特征是否会追踪行为变化。我们研究了代表迁徙梯度的四个石雀种群的形态计量学，并在相同的花园条件下饲养。通过多元分析，我们确定了与一般体型趋势明显不同的翅膀特征，并使用系统发育比较方法来检验以下预测：这些特征与圈养和野生种群的迁徙距离相关。石雀种群之间的尖度不同，与整体体型的变化独立，与迁徙距离相关。石雀的迁徙可能导致偏离比例大小的变化，这表明鸟类可能会在形态上适应自己行为所带来的选择压力，以应对不断变化的环境条件。
