We studied Wilson's Warbler (Wilsonia pusilla) and Yellow Warbler (Dendroica petechia) habitat use in allopatric and sympatric populations in the Rocky Mountains of northern Colorado and southeastern Wyoming in order to better understand the different habitat needs and interactions of these two species. Foraging Wilson's Warblers and Yellow Warblers used very similar habitat, both selecting larger, more open shrubs. In spite of similar foraging habitat, comparisons of habitat use by the two species at the sympatric sites yielded no evidence of foraging habitat partitioning or exclusion. There was evidence of nesting habitat partitioning. Wilson's Warblers nested on the ground, with some evidence that they used smaller, more densely stemmed shrubs under which to nest. Yellow Warblers are shrub nesters and selected larger, more open shrubs in which to nest. Results provide no evidence that Yellow Warblers can be blamed for population declines in Wilson's Warblers.
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1 October 2002
Breeding habitat use by sympatric and allopatric populations of Wilson’s Warblers and Yellow Warblers
Janet M. Ruth,
Thomas R. Stanley
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Journal of Field Ornithology
Vol. 73 • No. 4
October 2002
Vol. 73 • No. 4
October 2002
Colorado
Dendroica petechia
habitat use
montane willow habitat
resource partitioning
Wilsonia pusilla
Wyoming