, Volume 67, Issue 3, pp 283-288

Estimating the grazing impact of marine micro-zooplankton

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This paper describes a dilution technique for estimating the micro-zooplankton grazing impact on natural communities of marine phytoplankton. Experiments performed in coastal waters off Washington, USA (October, 1980), yield estimates of micro-zooplankton impact equivalent to 6 to 24% of phytoplankton standing biomass and 17 to 52% of production per day. Indirect evidence suggests that most of this impact is due to the feeding of copepod nauplii and tintinnids; in contrast, non-loricate ciliates, comprising 80 to 90% of numerical abundance, appeared to contribute little to phytoplankton mortality.

Contribution No. 1237 from the School of Oceanography, University of Washington, Seattle, Washington 98195, USA
Communicated by N.D. Holland, La Jolla