Are Insular Populations of the Philippine Falconet (Microhierax erythrogenys) Steps in a Cline?

The condor

Todd E. Katzner¹ 

关键词: colonization;    dispersal;    Microhierax;    Philippines;    stepped clines;    tropical raptors;   

DOI  :  10.1525/cond.2013.120070

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. Founder effects, new environments, and competition often produce changes in species colonizing islands, although the resulting endemism sometimes requires molecular identification. One method to identify fruitful areas for more detailed genetic study is through comparative morphological analyses. We measured 210 museum specimens to evaluate the potential morphological consequences of colonization across the Philippine archipelago by the Philippine Falconet (Microhierax erythrogenys). Measurements of both males and females differed clearly from island to island. Univariate and multivariate analysis of characteristics showed a latitudinal gradient, with the bill, wing, and tail of southern birds being larger than those of northern birds, forming the pattern of a stepped cline across a succession of islands. The stepped gradient in morphology and extensive differences between islands we observed provide evidence for multiple perspectives on phylogeny, including concordance with aggregate complexes ...

【 授权许可】

CC BY