Temporal variation of polychaetes from Picinguaba and Ubatumirim bights (southeastern Brazil)
Abstract:This study describes the temporal variability of the polychaetes between May 1993 and April 1994, at two monthly intervals at seven stations from 3 to 17 m depth in two small bights located in southeastern Brazil (São Paulo State). Maximum densities, biomass and richness of polychaetes were recorded in late spring (November) and summer (January). The lowest values were observed in winter (July) and early spring (September). The surface dwelling species of the families Spionidae, Cirratulidae, Pilargidae, Poecilochaetidae and Paraonidae were the main indicators of the temporal variability observed in the macrofauna community structure. The temporal distribution patterns were associated to the hydrodynamic processes present in the study area. The occurrence of cold fronts, more intense and frequent in winter, resulted in bottom re-suspension and extensive mortality of the surface life forms from shallow areas. Under these conditions, burrowing infaunal species or carnivorous species can predominate. The penetration of cold water masses during summer increased the concentration of nutrients and the recruitment of larval and juveniles.
Document Type: Research Article
Publication date: 2000-07-01
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