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

DENUNCIO, P; TRASSENS, M; CANTATORE, DMP; LANCIA, JP; BASTIDA, R

ECOLOGÍA AUSTRAL

ASOCIACIÓN ARGENTINA DE ECOLOGÍA

Lugar: Buenos Aires; Año: 2015 vol. 25 p. 128 - 134

0327-5477

Benthic polychaete association and their relationship with sedimentary parameters at south ofSamborombón Bay (Buenos Aires province, Argentina): The present work describes the structure of benthicpolychaete association of the southermost part of Samborombón Bay and its relationship with sediment after twodecades of the last study made in the same area. Three sampling stations were established: Punta Rasa, Taperade López and Arroyo San Clemente. Four species of polychaetes were identified: Laeonereis culveri, Heteromastussimilis, Alitta succinea and Polydora cornuta, being L. culveri and H. similis the most abundant. Variations betweenstations in terms of the association and relative abundances of polychaetes with granulometry of sediment wererecognized. Punta Rasa and Tapera de López were characterized almost exclusively by fine sand, observingthe four species of polychaetes with dominance of H. similis. In Arroyo San Clemente the dominant sedimentwas medium sand, with pelites becoming important; A. succinea was absent and L. culveri was dominant. Thisindicates that variation in the distribution of polychaetes would be strongly influenced by the sedimentaryparameters, and that this variation can arise even at small spatial scale. Both, polychaete species richnessand general density (individuals/m2) by station were lower than density annual values observed in studiesin 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 is important since it is anenvironment potentially affected by human activities, taking place mainly in the inner zone of the Río de laPlata estuary.