Hopkins Marine Station Student Paper

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Title: Microzooplankton grazing of phytoplankton in the equatorial Pacific
Student Author(s): Jacobson, Aubrie C.
Faculty Advisor(s): Chavez, Francisco
Pages: 46
Location: Final Papers Biology 175H
Date: June 1990
Abstract: This paper describes dilution experiments used to estimate grazing rates of microzooplankton on phytoplankton. The experiments, essentially following the guidelines prescribed by Landry and Hassett (1982), were conducted at three sites in the equatorial Pacific (7 N 132.5 W, 0, 125 W and 2 N, 110 W) in May 1990. Grazing estimates (0.62/day - 0.05/day) predict that 31.9 - 87.8% of the phytoplankton biomass is grazed daily. NaH14CO3 incorporation measurements were conducted and surface phytoplankton filters taken in order to test the non-density dependent assumption. Density inderpendent growth was observed.