The brown-headed cowbird and its riparian-dependent hosts in New Mexico
作者： Sara H. Schweitzer , Deborah M. Finch , Jr. Leslie
DOI: 10.2737/RMRS-GTR-1
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摘要: Schweitzer, Sara H.; Finch, Deborah M.; Leslie, Jr., David M. 1998. The brown-headed cowbird and its riparian-dependent hosts in New Mexico. General Technical Report RMRS-GTR-1. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 23 p. Numbers cowbirds (Molothrus ater) are increasing some regions North America, while certain populations long-distance, neotropical migratory songbirds (NTMs) declining. In the Southwestern United States, several species NTMs nest only riparian habitats. significant decline two dependent upon habitat, southwestern willow flycatcher (Empidonax traillii extimus) least Bell’s vireo (Vireo bellii pusillus), is great concern. Brood parasitism by loss habitat may be primary causes these populations. Extant data on distribution, abundance, density, rates Mexico have not been synthesized interpreted. Our goal was to collect review existing Mexico, compare them from adjacent western states, interpret findings. We hypothesized that increased human use habitats had resulted abundance their NTMs. results suggest quantitative studies should conducted determine Mexico’s because inadequate. Results such will allow conclusions made about multiplicative effects modification activities rare NTM
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