PERSONAL DE APOYO
SPACCESI Fernando Gustavo
artículos
Título:
Benthic invertebrate assemblage in Samborombón River (Argentina, S. America), a brackish plain river
Autor/es:
FERNANDO SPACCESI; ALBERTO RODRIGUES CAPÍTULO
Revista:
AQUATIC ECOLOGY
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2009 vol. 43 p. 1011 - 1022
ISSN:
1386-2588
Resumen:
The spatial and temporal differences in the structure and composition of benthic invertebrates were studied at three sites of the Samborombón River, which is an important tributary of the Río de la Plata Estuary (Argentina), having a low slope and brackish drainage. Biological samples were taken during each season. Physico-chemical variables were measured to determine their association in the benthic fauna distribution. Site 1, in the headstream, was characterized by freshwater Pampean organisms; site 2 showed the highest density, taxa diversity, and richness; brackish species, e.g., Laeonereis culveri, were found here. Site 3, close to the Samborombón Bay, was characterized by an unstable taxonomic composition that is strongly influenced by the estuary. The lowest density and taxonomic diversity of  organisms were registered and distinguished by estuarine species. The multivariate method (redundancy analysis) showed the benthic groups having an important spatial variability, superimposed on the temporal variability, associated with the salinity gradient of the river.