Multiscalar Ecological Characterization of Say's and Eastern Phoebes and their Zone of Contact in the Great Plains

The condor

John M. Schukman¹ 

关键词: contact zone;    ecological niche models;    Great Plains;    niche overlap;    Sayornis phoebe;    Sayornis saya;   

DOI  :  10.1525/cond.2011.100073

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. We assessed interspecific ecological relationships between Say's (Sayornis saya) and Eastern (S. phoebe) phoebes at three scales by developing ecological niche models at two spatial extents and comparing the models' predictions with data from local-scale surveys. The two species' habitats differed in several environmental attributes, primarily precipitation, temperature, and vegetation indices, at both extents. Local-scale surveys between -97° and -101° longitude revealed a steep gradation in ratios of occurrences Say's to the Eastern Phoebe, increasing from east to west. Local-scale occurrences coincided with results of ecological niche models at the extent of both the continent and contact zone, except for Eastern Phoebe occurrences and vegetation indices at both extents. Say's Phoebes nested in open country with sparse or no surrounding woodland, whereas Eastern Phoebe nests were primarily along woodland streams but also at seven sites in more open country where Say's Phoebes had nested previ...

【 授权许可】

CC BY