全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

Declines of Aerial Insectivores in North America Follow a Geographic Gradient

DOI: 10.5751/ace-00391-050201

Keywords: aerial insectivores , geographical gradient , migration distance , migratory birds , North American Breeding Bird Survey , population decline

Full-Text   Cite this paper   Add to My Lib

Abstract:

North American birds that feed on aerial insects are experiencing widespread population declines. An analysis of the North American Breeding Bird Survey trend estimates for 1966 to 2006 suggests that declines in this guild are significantly stronger than in passerines in general. The pattern of decline also shows a striking geographical gradient, with aerial insectivore declines becoming more prevalent towards the northeast of North America. Declines are also more acute in species that migrate long distances compared to those that migrate short distances. The declines become manifest, almost without exception, in the mid 1980s. The taxonomic breadth of these downward trends suggests that declines in aerial insectivore populations are linked to changes in populations of flying insects, and these changes might be indicative of underlying ecosystem changes.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133