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JOURNAL OF PLANKTON RESEARCH | VOLUME 5 | NUMBER 2 | PAGES 289-303 | 1983
© Oxford University Press

research-article

The transport and retention of zooplankton in relation to a sill in a tidal estuary1

Marc Gagnon2 and Guy Lacroix

Départment de Biologie, Université Laval Ste-Foy, Québec G1K 7P4, Canada

Received on July 1, 1982; accepted on November 1, 1982

The exchange of zooplankton between two basins separated by a sill in the upper St. Lawrence estuary, Québec (Canada), was investigated using simultaneous times series of current velocity at various depths and zooplankton vertical samples at an anchor station in the vicinity of a sill. Though strictly accurate estimates of organisms exchange could not be obtained in this manner, it was possible to break down the exchange into a mean flow mode, the magnitude and direction of which depends on the mean flow of water at the depth where the organisms are concentrated, and a turbulent mode which is independent of water exchange and varies considerably on a species basis. The second mode of exchange is caused by differences in the concentration of organisms between ebb and flood tides. The opposition of the two modes of exchange, which is presumably a feature of sill areas, could explain the maintenance of large copepod populations in the vicinity of the sill.

1Contribution to GIROQ program (Groupe interuniversitaire de recherches océanographiques du Québec).

2Present address: BIO-CONSEIL Inc., 105 Côte de la Montagne, suite 501, Québec, Canada.


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