INVESTIGADORES
DIAZ DE ASTARLOA Juan Martin
artículos
Título:
Long term fish assemblages as units of management in a temperate estuary (Rio de la Plata - SW Atlantic Ocean)
Autor/es:
LORENZO, M.I.; DÍAZ DE ASTARLOA, J. M.; NORBIS, W.; COUSSEAU, MARÍA B
Revista:
BRAZILIAN JOURNAL OF OCEANOGRAPHY
Editorial:
INST OCEANOGRAFICO
Referencias:
Año: 2011 vol. 59 p. 43 - 59
ISSN:
1679-8759
Resumen:
Demersal fish assemblages from trawl surveys in the Rio de la Plata estuary and its inner continental
shelf were analyzed from 1975 to 1995. The first two factors of Principal Component Analysis
explained 48% of the variance in species distribution, and they are consistent with the results of a
cluster analysis. The analysis indicated the existence of three spatially and temporally distinct fish
assemblages: internal and external estuarine and inner continental shelf (Uruguayan coastal
assemblages). These assemblages were persistent considering the environmental characteristics and
their species composition. Despite the changes registered in the species density during the period
surveyed, the fish assemblages tend to persist over time. It was demonstrated that the assemblages
can be considered as open systems and that there exists a reciprocal flow of organisms between
adjacent associations. However, each assemblage showed high spatial and temporal persistence in
accordance with the environmental characteristics of the system analyzed. Therefore, and according
to the multispecies fisheries operating in the system, each assemblage defined could be considered a
unit of management.