Feeding of the Estuarine Copepod Acartia Tonsa Dana: Carnivory VS. Herbivory in Natural Microplankton Assemblages
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 micro zooplankton carbon: phytoplankton carbon available were 0.03, 0.02 and 0.004 respectively. Chlorophyll was cleared at low rates (<1 ml·copepod−1·h−1) in the three experiments, but because of its high standing stocks (> 17 µg·l−1) comprised a relatively large portion of the copepod's total carbon ingestion. Of the total carbon ingested, microzooplankton accounted for 41, 11, and 3% in August, September, and January.
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Document Type: Research Article
Publication date: 1988-11-01
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