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The present work describes the structure of benthic polychaete association of the southermost part of Samborombon Bay and its relationship with sediment after two decades of the last study made in the same area. Three sampling stations were established: Punta Rasa, Tapera de Lopez and Arroyo San Clemente. Four species of polychaetes were identified: Laeonereis culveri, Heteromastus simili s, Alitta succinea and Polydora cornuta , being L. culveri and H. simili s the most abundant. Variations between stations in terms of the association and relative abundances of polychaetes with granulometry of sediment were recognized. Punta Rasa and Tapera de Lopez were characterized almost exclusively by fine sand, observing the four species of polychaetes with dominance of H. simili s. In Arroyo San Clemente the dominant sediment was medium sand, with pelites becoming important; A. succinea was absent and L. culveri was dominant. This indicates that variation in the distribution of polychaetes would be strongly influenced by the sedimentary parameters, and that this variation can arise even at small spatial scale. Both, polychaete species richness and general density (individuals/m 2 ) by station were lower than density annual values observed in studies in the ‘90s. This could be because this study was conducted in the early fall, after shorebirds concentration (spring-summer), that strongly fed of these benthic organisms. This kind of studies are important since it is an environment potentially affected by human activities, taking place mainly in the inner zone of the Rio de la Plata estuary.

ecología austral/ecología austral

Asociaciones de poliquetos bentónicos y su relación con los parámetros sedimentarios en el sur de la Bahía Samborombón (provincia de Buenos Aires, Argentina)