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Scrub-shrub bird habitat associations at multiple spatial scales in beaver meadows in Massachusetts

The Auk

By:
, , and
https://doi.org/10.1525/auk.2009.08083

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Abstract

Most scrub-shrub bird species are declining in the northeastern United States, and these declines are largely attributed to regional declines in habitat availability. American Beaver (Castor canadensis; hereafter “beaver”) populations have been increasing in the Northeast in recent decades, and beavers create scrub-shrub habitat through their dam-building and foraging activities. Few systematic studies have been conducted on the value of beaver-modified habitats for scrub-shrub birds, and these data are important for understanding habitat selection of scrub-shrub birds as well as for assessing regional habitat availability for these species. We conducted surveys in 37 beaver meadows in a 2,800-km2 study area in western Massachusetts during 2005 and 2006 to determine the extent to which these beaver-modified habitats are used by scrub-shrub birds, as well as the characteristics of beaver meadows most closely related to bird use. We modeled bird abundance in relation to microhabitat-, patch-, and landscape-context variables while adjusting for survey-specific covariates affecting detectability using N-mixture models. We found that scrub-shrub birds of regional conservation concern occupied these sites and that birds responded differently to microhabitat, patch, and landscape characteristics of beaver meadows. Generally, scrub-shrub birds increased in abundance along a gradient of increasing vegetation complexity, and three species were positively related to patch size. We conclude that these habitats can potentially play an important role in regional conservation of scrub-shrub birds and recommend that conservation priority be given to larger beaver meadows with diverse vegetation structure and composition.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Scrub-shrub bird habitat associations at multiple spatial scales in beaver meadows in Massachusetts
Series title:
The Auk
DOI:
10.1525/auk.2009.08083
Volume:
126
Issue:
1
Year Published:
2009
Language:
English
Publisher:
American Ornithological Society
Description:
12 p.
First page:
186
Last page:
197
Country:
United States
State:
Massachusetts