Gifford, D.J. & M.J. Dagg. (1989). Feeding of the estuarine copepod Acartia tonsa Dana: carnivory vs herbivory in natural microplankton assemblages. In: Paffenhöfer, G.A. & H.J. Price (eds.). Zooplankton behavior symposium, 13-16 April 1987, Savannah, Georgia, U.S.A. Bulletin of Marine Science 43(3):458-468, figs. 1-6, tabs. 1-3. (14.ii.1989)

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Gifford, D.J. & M.J. Dagg

1989

43(3):458-468, figs. 1-6, tabs. 1-3. (14.ii.1989)

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Acartia tonsa was fed natural microplankton assemblages from Terrebonne Bay, Louisiana. In experiments done under three different environmental regimes, the ratios of microzooplankton carbon: phytoplankton carbon consumed were 0.69, 0.12, and 0.03 in August, September, and January when the ratios of microzooplankton carbon: phytoplankton carbon available were 0.03, 0.02 and 0.004 respectively. Chlorophyll was cleared at low rates « I ml·copepod- I • h- 1 ) in the three experiments, but because of its high standing stocks (> 17 !lg' I-I) comprised a relatively large portion of the copepod's total carbon ingestion. Of the total carbon ingested, microzooplankton accounted for 41, II, and 3% in August, September, and January.

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