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The mean objectives of the present study were to establish the existence of demersal fish associations in the shelf and superior slope of the colombian Caribbean northern zone and determine if the biotical patterns determineted by these associations are correlationed with the patterns structured by the environmental conditions evaluated.  Data were taken from three demersal resources assessment surveys of the INPA-VECEP/UE Program, carried out during the period 1995-1996.  The station groups were not consistent in terms of species composition along the different periods.  The dominant characteristic of demersal species associations was the abcense of temporal persistence. Only It was possible to find some partial associations which remain during a maximum of two sampling periods: Rhomboplites aurorubens/Priacanthus arenatus, Lutjanus analis/Lutjanus synagris y Eucinostomus argenteus/Upeneus parvus.  It were observed seasonal changes in the set of environmental variables which better explain the community structure, but depth always appears in the optimal correlation set.  Apparently, species co-existence is rather due to a common answer to environmental gradients, than to species interactions.  Nevertheless, the relatively low correlations seem to indicate that other factors, like migrations for biological reasons, could also affect the structure and composition of  demersal fish associations, on a smaller time scale.

CARACTERIZACIÓN ECOLÓGICA DE LAS ASOCIACIONES DE PECES DEMERSALES DEL CARIBE COLOMBIANO NORTE, CON ENFÁSIS EN PARGO (LUTJANIDAE)