Avian succession along ecological gradients： Insight from species-poor and species-rich communities of Sylvia warblers  

作　　者：Alban GUILLAUMET Roger PRODON 

机构地区：[1]EPHE, CEFE-CNRS UMR 5175, 1919 route de Mende, 34293 Montpellier cedex 5, France [2]Department of Wildlife, Fisheries & Aquaculture, Mail Stop 9690, Mississippi State University, Mississippi, MS 39762, USA

出　　处：《Current Zoology》2011年第3期307-317,共11页动物学报（英文版）

摘　　要：The mechanisms responsible for species replacement during ecological successions is a long-standing and open debate. In this study, we examined the distribution of the Sardinian warbler Sylvia melanocephala along two grassland-to-forest gradients, one in a high-diversity area （Albera-Aspres chain in Catalonia： eight Sylvia warbler species） and one in a low-diversity area （Mount Hymittos in Greece： four species）. In Catalonia, distribution models suggested that the apparent exclusion of S. melanocephala from the open and forest ends of the gradient may be explained entirely by the preference of S. melanocephala for mid-successional shrublands. However, a joint analysis of both data sets revealed that： 1） S. melanocephala was more evenly dis- tributed along the vegetation gradient in Greece, suggesting ecological release in the low-diversity area; and 2） a distribution model assuming interspecific competition （based on the distribution of Sylvia species showing a negative co-occurrence pattern with S. melanocephala） had a significantly higher predictive ability than a distribution model based on habitat variables alone. Our study supports the view that species turnover along ecological gradients generally results from a combination of intrinsic preferences and interspecific competition [Current Zoology 57 （3）： 307-317, 2011].

关 键 词：Avian succession Cross-validation Diffuse competition Ecological release GLM Habitat selection Nichewidening Species distribution model 

分 类 号：S718.3[农业科学—林学] Q16[生物学—普通生物学]