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Phylogenetic analyses of the diversity of moult strategies in Sylviidae in relation to migration

机译：系统进化分析与迁移有关的锦葵科蜕变策略的多样性。

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Moult in birds is highly variable both within and among bird genera. The aim of the present study was to make an extended phylogcnctic analysis of the diversity of moult strategies within Syiviidae in light of the recent phylogenies based on molecular data, and with the methodology of matched-pairs analysis. In the present study we analysed 141 sylviid taxa and, to improve character reconstruction, 22 outgroup taxa. The study could corroborate the earlier results that post-breeding moult is the ancestral state in Sylviidae. Migratory habits were found to be ancestral within Sylviidae but resident habits have evolved several times with a few reverse transitions back to migratory habits. Transitions in main moult strategy were significantly related to both migratory vs. resident habits and to migratory distance, giving support to the hypothesis that moult in the non-breeding season is related to migration as such and long-distance migration, respectively. Both resident and migratory taxa used minor alternative moult strategies besides the main moult strategy and such within-taxon flexibility might be a basal trait in Sylviidae. We investigated three variables that included minor strategies and found no relationship between these and migratory habits. However, two of these variables (the potential to interrupt moult and the occurrence of moult in both the post- and non-breeding seasons) were significantly related to migration distance. We conclude that migration patterns has some influence on the choice of moult strategy, and that flexibility in timing of moult is widespread within Sylviidae and might be a basal trait. We argue that such flexibility might be a prerequisite for changes in migratory strategies.
机译：鸟类的内部和鸟类之间的换羽高度变化。本研究的目的是根据分子数据和配对对的方法，根据最近的系统发育史，对S科内的换羽策略的多样性进行扩展的植物学分析。在本研究中，我们分析了141个西尔维类单元，为了改善字符重建，分析了22个外单元类群。该研究可以证实较早的结果，即换毛后蜕皮是S科的祖先状态。迁徙习惯被发现是S科的祖先，但居民习惯已经发展了数次，并有一些反向过渡到迁徙习惯。主要换羽策略的转变与迁徙与居住习性以及迁徙距离都显着相关，这支持了非繁殖季节换羽分别与迁徙本身和远距离迁徙有关的假说。居民和迁徙类群都使用了次要的换毛策略，而不是主要的换毛策略，而且这种分类内部的灵活性可能是S科的基本特征。我们调查了包括次要策略在内的三个变量，发现这些与迁徙习惯之间没有关系。然而，这些变量中的两个（在繁殖后季节和非繁殖季节都可能发生蜕皮和发生蜕皮）与迁徙距离显着相关。我们得出的结论是，迁徙方式对换羽策略的选择有一定影响，并且换羽时机的灵活性在Sylviidae内广泛存在，可能是其基本特征。我们认为，这种灵活性可能是改变迁徙策略的先决条件。

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