Biology ETDs

Publication Date



The foraging activities of the Olive Warbler (Peucedramus taeniatus) and three other foliage-gleaning species were studied in the Chiricahua Mountains of southeastern Arizona during the summer of 1973. Grace's Warblers (Dendroica graciae), the most specialized of the four species, foraged most similarly to Peucedramus and is probably the latter is strongest potential competitor during the breeding season. The small size of D. graciae appeared to facilitate foraging in pine foliage and may be an important factor in promoting ecological segregation from the Olive Warbler. Audubon's Warblers (D. coronata) and Pygmy Nuthatches (Sitta pygmaea) were more generalized in their feeding activities and, in this regard, are probably less important than Grace's Warblers as potential competitors of Olive Warblers. Foraging similarity was greater between the sexes in the Olive Warbler than between any two species. Nonetheless, male and female Olive Warblers exhibited statistically significant differences in several aspects of their foraging.

Project Sponsors

Student Research Allocations Committee of the University of New Mexico



Document Type


Degree Name


Level of Degree


Department Name

UNM Biology Department

First Committee Member (Chair)

J. David Ligon

Second Committee Member

Joe Scott Altenbach

Third Committee Member

James Smith Findley

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Biology Commons