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Influence of trees in the landscape on parasitism rates of grassland passerine nests in Southeastern North Dakota

Condor

By:
, , , , and
DOI: 10.1525/cond.2009.080012

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Abstract

Woody vegetation has been linked to increased rates of Brown-headed Cowbird (Molothrus ater) parasitism for some grassland hosts. In northern North Dakota, however, studies reported that parasitism of grassland passerine nests was lower in landscapes with trees than in those without trees. We looked for evidence of this pattern elsewhere, using data from two studies conducted on the Sheyenne National Grassland in southeastern North Dakota. Specifically, we examined the probability of parasitism relative to percent tree cover within 2 km of a nest. We found a negative relationship for grassland passerine nests of all species tested. Our results support the suggestion that cowbirds are less likely to parasitize nests of grassland passerines where tree cover on the landscape is greater. This pattern could be explained by cowbirds switching to alternative hosts in woodlands, but this hypothesis needs further testing. ?? 2009 by The Cooper Ornithological Society. All rights reserved.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Influence of trees in the landscape on parasitism rates of grassland passerine nests in Southeastern North Dakota
Series title:
Condor
DOI:
10.1525/cond.2009.080012
Volume
111
Issue:
1
Year Published:
2009
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Condor
First page:
36
Last page:
42