论文信息 - Population status of North American grassland birds from the North American Breeding Bird Survey

Population status of North American grassland birds from the North American Breeding Bird Survey

We summarize population trends for grassland birds from 1966 to 1996 using data from the North American Breeding Bird Survey. Collectively, grassland birds showed the smallest percentage of species that increased of any Breeding Bird Survey bird group, and population declines prevailed throughout most of North America. Although 3 grassland bird species experienced significant population increases between 1966 and 1996, 13 species declined significantly and 9 exhibited nonsignificant trend estimates. We summarize the temporal and geographic patterns of the trends for grassland bird species and discuss factors that have contributed to these trends. LA CONDICI6N DE LA POBLACI6N DE AVES DE PASTIZAL EN AMBRICA DEL NORTE UTILIZANDO EL BREEDING BIRD SURVEY DE NORTEAMfiRICA, 1966-1996 Sinopsis. Resumimos las tendencias poblacionales para las aves de pas&al desde 1966 hasta 1996 utilizando datos de1 Breeding Bird Survey de NorteamCrica. Colectivamente, las aves de pas&al tuvieron el menor porcentaje de especies que aumentaron entre todos 10s grupos de aves en el Breeding Bird Survey. Prevalecieron las disminuciones de poblaciones de estas aves en la mayoria de Norteamtrica. Aunque 3 especies de aves de pastizal experimentaron importantes aumentos poblacionales entre 1966 y 1996, 13 especies disminuyeron significativamente y 9 manifestaron estimaciones de tendencias no significativas. Resumimos 10s patrones temporales y geog&ficos de las tendencias para especies de aves de pastizal y analizamos 10s elementos que han contribuido a estas tendencias.

Bruce G. Peterjohn | John R. Sauer | J. Sauer | B. Peterjohn

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