Containment effects from enclosing unfiltered seawater and copepods in 500‐ml jars to estimate grazing rate were examined six times during 48‐h incubations. Crazing rates decreased rapidly for the first 3 h (up to 50%) and then continued to decrease at slower rates. The number of bacteria increased in both control and experimental jars. Variable but significant changes were found in the size distribution of particles and concentrations of adenosine triphosphate and chlorophyll a. Ammonia concentrations were higher in jars with copepods. After 24 h, grazing rates calculated from control jars with NH4+ additions to simulate copepod excretion were about twice those calculated from unamended controls. The grazers removed 2% of the 3‐5‐µm particles compared to unamended controls and 17% compared to control jars plus NH4+.
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Roman et al. (1980) studied this question.