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A preliminary assessment of the habitat selection of two Palaearctic migrant passerine species in West Africa

机译：西非两种古北移徙雀形目物种栖息地选择的初步评估

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摘要

We investigated the habitat selected by two Palaearctic migrants (Pied Flycatcher, Ficedula hypoleuca, Willow Warbler, Phylloscopus trochilus) in a patchy landscape in Ivory Coast and compared it with the habitat selection of Afrotropical species in the same foraging guilds. Transect counts were used to test the hypothesis that migrants use more open and more seasonal habitats and have a broader use of habitats compared with resident species. Habitats compared were, in order of decreasing tree density, gallery forest, an isolated forest and bush/tree savanna. The isolated forest had the most pronounced seasonal changes (deciduous trees) and was the one with the most diverse vegetation structure. The habitat where both migrants were most frequent was the isolated forest, and thus occurred in the habitat with the most pronounced seasonal change. Diversity of habitats selected was highest in migrants but in the Pied Flycatcher this was possibly an artefact due to subdominant individuals being excluded from the preferred habitat by territorial birds. Potential competition for habitat with Afrotropical species was found to be low.
机译：我们调查了在象牙海岸一片斑驳的景观中由两个古古生物学迁徙者（斑F，ly蝇，柳莺，柳莺）选择的生境，并将其与同一个觅食行会中的非热带物种的生境选择进行了比较。样带计数用于检验以下假设：与居民物种相比，移民使用更开放和更多的季节性生境，并且生境的使用范围更广。按照树木密度递减的顺序比较了栖息地，其中包括廊林，孤立的森林和灌木/树木稀树草原。孤立的森林具有最明显的季节性变化（落叶乔木），并且是植被结构最多样化的森林。两个移民最频繁的栖息地是孤立的森林，因此发生在季节变化最明显的栖息地。所选栖息地的多样性在移徙者中最高，但在捕蝇器中，这可能是一种人工制品，因为主要鸟类被领土鸟类排除在首选栖息地之外。发现与非热带物种栖息地的潜在竞争很低。

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