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University of Arizona (1984)

AVIAN HABITAT SELECTION IN A MIXED CREOSOTEBUSH-GRASSLAND COMMUNITY

Smith, Brenda Hale

Titre : AVIAN HABITAT SELECTION IN A MIXED CREOSOTEBUSH-GRASSLAND COMMUNITY.

Auteur : Smith, Brenda Hale.

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1984

Résumé
Black-throated sparrow (Amphispiza bilineata) use of an altered creosotebush (Larrea tridentats) community was examined on the Santa Rita Experimental Range, south of Tucson, Arizona, from October 1981 to December 1982. The community was treated with tebuthiuron, was mechanically crushed, or both in 1976 and 1977. Densities of all bird species varied seasonally and were generally highest on tebuthiuron treated plots, reaching 11 birds/ha during fall 1982. Five Cassin’s sparrow (Aimophila cassinii) nests were found on tebuthiuron-treated plots. Black-throated sparrows used a variety of shrubs and grasses with eight of 45 nests in live creosotebush and nine in dead creosotebush. Black-throated sparrow nests were generally built in areas with higher creosotebush cover or density and lower succulent and grass densities than average values on the plots for these vegetation types. The combination of tebuthiuron and mechanical treatments opened small areas in the creosotebush community and provided nesting areas for Cassin’s sparrows during summer and feeding areas for granivorous flocks during the non-breeding season.

Mots clés : Bird populations — Ecology. ; Birds — Habitat. ; Desert ecology — Arizona — Santa Rita Experimental Range. ; Desert ecology — Arizona — Pima County.

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