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Seasonal Dynamics of Bird Assemblages in a Texas Estuarine Wetland (Dinámica Estacional de Agregaciones de Aves en un Estuario en Texas)

Milton W. Weller
Journal of Field Ornithology
Vol. 65, No. 3 (Summer, 1994), pp. 388-401
Published by: Wiley on behalf of Association of Field Ornithologists
Stable URL: http://www.jstor.org/stable/4513957
Page Count: 14
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Seasonal Dynamics of Bird Assemblages in a Texas Estuarine Wetland (Dinámica Estacional de Agregaciones de Aves en un Estuario en Texas)
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Abstract

Bird species richness and seasonality were sampled in diverse habitats of an estuarine wetland complex of San Bernard National Wildlife Refuge on the mid-Texas coast. Observations made between 1985 and 1991 included all months, and form a composite annual view; 121 species were recorded, with 54 taxa identified in 1 mo. Only 23 species occurred regularly over a series of months, and their patterns of wetland use varied markedly by species and season. The wetland complex served different functions for different species, but most used the area for migration stops and wintering. Eleven species were considered breeders in the brackish marsh, but another 33 species probably nested in nearby freshwater wetlands, coastal islands or in shrubs or small trees, and fed or rested in the marsh. Such coastal areas are used by birds year-round and, in addition to protection, need management strategies to ensure habitat diversity and normal water regimes which will maintain natural bird diversity and serve all species for different life stages. /// Se muestrearon la riqueza en especies de aves en habitats diversos dentro del complejo estuarino del Refugio de Vida Silvestre de San Bernard en la costa media de Texas. Se hicieron observaciones que incluyeron todos los meses entre 1985 y 1991, lo que forma una visión anual. Se registraron 121 especies en un mes. Sólo 23 especies se observaron regularmente a través de varios meses, y sus patrones en el uso de la zona anegada variaron por especie y por temporada. Diferentes especies utilizaron el complejo de zonas anegadas con diferentes propósitos, pero la mayoría utilizó el área para descanso en la migración y para invernar. Once especies se consideraron reproductivos en la ciénaga salobre, pero otras 33 especies probablement anidaron en los pantanos de agua dulce cercanos, en islotes costeros o en árboles cercanos, y se alimentaron o descansaron en la ciénaga. Estas áreas costaneras son utilizadas por las aves a través del año y necesitan protección, además de estrategias de manejo para asegurar diversidad de hábitats y regímenes normales de agua que mantengan una diversidad de aves natural y que sirvan a todas las especies en todas sus etapas de vida.

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