Influence of Patch Size and Shape on Occupancy by Shrubland Birds

The condor

Corey S. Shake¹ 

关键词: area-sensitive;    landscape;    occupancy modeling;    Prairie Warbler;    shrubland birds;    Yellow-breasted Chat;   

DOI  :  10.1525/cond.2012.110107

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. Populations of many shrubland bird species are declining in the eastern United States. Efforts to restore shrubland and early-successional forest may help to ameliorate these declines. However, uncertainty remains about how the size and shape of habitat patches and the surrounding habitat matrix affect patch occupancy by shrubland passerines. Our objectives were to determine if shrubland birds avoid small or irregularly shaped habitat patches and to identify minimum area requirements for area-sensitive species. Additionally, we sought to determine if the proportion of mature forest cover in the landscape influences patch occupancy. We surveyed 35 individual habitat patches in 2007 and 43 in 2008 for the presence of eight shrubland birds. Then, we modeled the probability of five of these species occupying an individual patch relative to patch area, patch shape, and percent forest cover within 1 km of the patch. We documented evidence of area sensitivity for the Yellow-breasted Chat (Icteria viren...

【 授权许可】

CC BY