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JOURNAL OF PLANKTON RESEARCH | VOLUME 3 | NUMBER 4 | PAGES 593-602 | 1981
© Oxford University Press

research-article

Vertical distribution of zooplankton respiration in relation to the intense oxygen minimum zones in two British Columbia fjords1

Allan H. Devol

Fisheries Research Institute, College of Fisheries, University of Washington Seattle, Washington 98195, U.S.A.

Received on December 1, 1980; accepted on April 1, 1981

The vertical distribution of zooplankton respiration rate as estimated from respiratory enzyme activity (ETS activity) is presented in relation to the intense oxygen deficient zones of two British Columbia fjords. In both inlets the maximum zooplankton respiration rate was often found immediately above the oxygen deficient zone. Also there was a complete lack of zooplankton respiration (due to a complete lack of zooplankton) in waters with dissolved oxygen concentrations less than about 5 µg-atoms t–1. Thus, in these inlets it appears that waters containing less than 5 µg-atoms 0 t–1 act as a barrier to zooplankton migration. The significance of this barrier is indicated by calculations that show zooplankton respiration in the layer immediately above the oxygen deficient zone to be quantitatively important in the formation and stabilization of the oxygen deficient zone.

1Contribution No. 564 from the Fisheries Research Institute, University of Washington.


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