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Use of seeded exotic grasslands by wintering birds

The Prairie Naturalist

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Abstract

Despite widespread population declines of North American grassland birds, effects of anthropogenic disturbance of wintering habitat of this guild remain poorly understood. We compared avian abundance and habitat structure in fields planted by the exotic grass Old World bluestem (Bothriochloa ischaemum; OWB) to that in native mixed-grass prairie. During winters of 2007-2008 and 2008-2009, we conducted bird and vegetation surveys in six native grass and six OWB fields in Garfield, Grant, and Alfalfa counties, Oklahoma. We recorded 24 species of wintering birds in native fields and 14 species in OWB monocultures. While vegetation structure was similar between field types, abundance of short-eared owls (Asio flammeus), northern harriers (Circus cyaneus) and Smith's longspurs (Calcarius pictus) was higher in OWB fields during at least one year. The use of OWB fields by multiple species occupying different trophic positions suggested that vegetation structure of OWB can meet habitat requirements of some wintering birds, but there is insufficient evidence to determine if it provides superior conditions to native grasses.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Use of seeded exotic grasslands by wintering birds
Series title:
The Prairie Naturalist
Volume
45
Issue:
2
Year Published:
2013
Language:
English
Publisher:
South Dakota State University
Contributing office(s):
Oklahoma Cooperative Fish and Wildlife Research Unit
Description:
7 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
The Prairie Naturalist
First page:
77
Last page:
83
Country:
United States
State:
Oklahoma
County:
Alfalfa County;Garfield County;Grant County