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JOURNAL OF PLANKTON RESEARCH | VOLUME 5 | NUMBER 6 | PAGES 891-900 | 1983
© Oxford University Press

research-article

Coexistence and segregation of congeneric pelagic copepods: spatial distribution of the Acartia complex in the rķa of Vigo (NW of Spain)

Miguel Alcaraz

Instituto de Investigaciones Pesqueras PQ National s/n, Barcelona-3, Spain

Received on February 1, 1983; accepted on August 1, 1983 Four congeneric species of pelagic copepods (Acartia margalefi, A. clausi, A. discaudata and A. grani) coexist in the rķa of Vigo, an estuary located on the NW Spanish coast. There is a partial segregation of the species along the axis of the rķa, their respective abundances decreasing exponentially from the zones of maximum densities. A. margalefi and A. grani have been found exclusively in the inner part of the rķa, while A. clausi is more abundant in the external zones, and A. discaudata occupies an intermediate area. Temperature and salinity gradients seem to have less importance than the spatial differences in stability (in the sense of persistence of environmental factors) as determining the species segregation.


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