IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
artículos
Título:
First report on the contribution of small-sized species to the copepod community structure of the southern Patagonian shelf (Argentina, 47°-55°S)
Autor/es:
ANTACLI, J.C.; HERNÁNDEZ, D.R.; SABATINI, M.E.,
Revista:
SCIENTIA MARINA
Editorial:
INST CIENCIAS MAR BARCELONA
Referencias:
Lugar: Barcelona; Año: 2014 vol. 78 p. 17 - 26
ISSN:
0214-8358
Resumen:
The copepod community structure, with special emphasis on small-sized species, was studied over the southern Patagonian shelf during late summer 2004, applying the first plankton sampling in the region with a fine-mesh (66 µm) net. The key role of the copepods Drepanopus forcipatus and Calanus australis was confirmed, but at the same time the high abundance and frequency of occurrence of the microcopepods Oithona helgolandica and Microsetella norvegica and of the medium-sized copepod Ctenocalanus vanus were revealed. Copepod community structure was nearly homogenous over the entire study area. Drepanopus forcipatus, O. helgolandica and M. norvegica were identified as the typical species of the region, although secondarily C. australis and Oithona atlantica also contributed significantly to community similarity across the area. The study of interspecific relationships of dominant copepods indicated that D. forcipatus and C. australis were associated positively with O. helgolandica, while C. vanus, and M. norvegica constituted a separate assemblage with Clausocalanus brevipes and Oithona atlantica. The importance of fine mesh-size nets for collecting the smaller size-fractions of mesozooplankton and for portraying accurately the mesozooplankton assemblage structure in the area is stressed by this study.