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espanolLos ambientes costeros de Chile central son sitios importantes para playeros residentes y migratorios. Los ambientes estuarinos son habitats criticos que proveen sitios de descanso y recursos alimentarios para playeros que recuperan energia durante su migracion. Se hipotetizo que los playeros escogen habitats especificos en el humedal del Rio Aconcagua, Chile central, basados en la disponibilidad de alimento. Para probar esta hipotesis se evaluo la composicion, abundancia y distribucion espacial del ensamble bentonico en areas de alimentacion. La prediccion principal fue que el tipo de alimento reflejaria la distribucion espacial de playeros. El total de invertebrados bentonicos fue 11.514 individuos, correspondiente a 25 taxa, siendo crustaceos, poliquetos, oligoquetos e insectos los grupos taxonomicos mayores. El total de playeros fue 2.105, y 1.136 individuos en actividad alimentaria correspondiente a 18 especies de las Familias Charadriidae, Haematopodidae, Recurvirostridae y Scolopacidae. Las planicies intermareales del area de estudio exhiben distribuciones espaciales no aleatorias de playeros en actividad alimentaria, relacionadas a la disponibilidad de alimento al interior del humedal del Rio Aconcagua. El analisis integrado mostro diferencias significativas entre planicies intermareales basadas en la abundancia y composicion del ensamble bentonico (mediado por las caracteristicas del sedimento), y tambien algunas relaciones entre playeros en actividad alimentaria y grupos troficos en planicies intermareales particulares. Estos resultados tienen implicancias para la conservacion de playeros y la gestion de humedales, principalmente en relacion a cambios ambientales, perdida y destruccion de habitat relacionados con la declinacion de poblaciones de playeros a nivel mundial. EnglishCoastal landscapes of central Chile are important places for species of resident and migratory shorebirds. Estuarine environments are critical habitats that provide resting places and food resources for large concentrations of shorebirds to replenish their energy during their migration. We hypothesized that shorebirds choose particular habitats based on food availability in a tidal wetland of Aconcagua River, central Chile. We evaluated composition and abundance of benthic ensemble in foraging areas, and its local spatial distributions in these foraging areas. The main prediction was that selected trophic items may reflect the main distribution of shorebirds. The total benthic invertebrates registered were 11,514 individuals, corresponding to 25 taxa, being crustaceans, polychaetes, oligochaetes, and insects the major taxonomic groups. The total and foraging shorebirds registered were 2,105 and 1,136 individuals, respectively; corresponding to 18 species belonged to 4 Families: Charadriidae, Haematopodidae, Recurvirostridae and Scolopacidae. Tidal flats around the study site exhibit non-random spatial distributions of feeding shorebirds, responding to food availability within the Aconcagua river wetland. Our integrated analysis showed significant differences between tidal flat areas based on abundance and composition of benthic trophic items (mediated by sediment characteristics), and some relationships between foraging shorebirds and trophic items in particular tidal flat areas. These results have implications for shorebird conservation and future wetland management, mainly in relation to environmental changes and other causes of habitat loss and destruction linked with worldwide decline in many shorebird populations.

Benthic food distribution as a predictor of the spatial distribution for shorebirds in a wetland of central Chile