Distribution and habitat associations of breeding secretive marsh birds in Louisiana's Mississippi Alluvial Valley

Wetlands
U.S. Fish & Wildlife Service State Wildlife; Louisiana Department of Wildlife and Fisheries.
By: , and 

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Abstract

Populations of many North American secretive marsh birds (SMBs) have declined in recent decades, partially as a function of wetland loss. Protecting and restoring appropriate habitat for these species is contingent upon understanding the habitat features they utilize. We investigated breeding distributions of SMBs in northeast Louisiana at 118 wetlands in 2007 and 2008 and modeled species occupancy (psi) as a function of habitat variables measured at local (<= 100 m) and landscape (<= 1 km) scales. Common Moorhens (Gallinula chloropus), Least Bitterns (Ixobrychus exilis), and Purple Gallinules (Porphyrula martinica) were the most commonly detected species, whereas breeding King Rails (Rallus elegans) and American Coots (Fulica americana) were rare. Local habitat features consistently played a greater role in predicting psi than landscape features for the three most common species. The proportion of local wetland area dominated by robust emergent vegetation (i.e., Typha spp. and Zizaniopsis miliacea) positively influenced psi for all species, while other wetland vegetation types tended to have a minimal or negative effect. Our results suggest the habitat characteristics preferred by breeding SMBs differ from those used by migrating shorebirds and wintering waterfowl and management and restoration objectives for those species may be inadequate for enhancing SMB habitat.

Study Area

Publication type Article
Publication Subtype Journal Article
Title Distribution and habitat associations of breeding secretive marsh birds in Louisiana's Mississippi Alluvial Valley
Series title Wetlands
DOI 10.1007/s13157-010-0138-3
Volume 31
Issue 1
Year Published 2011
Language English
Publisher Springer
Contributing office(s) Coop Res Unit Atlanta
Description 11 p.
First page 1
Last page 10
Country United States
State Louisana
Other Geospatial Alluvial Valley
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