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The ingestion of autotrophic and heterotrophic nanoplankton by two estuarine copepods, Eurytemora affinis and Acartia bifilosa, was measured in various environmental conditions using the incubation method and epifluorescence microscopy. Egg production of the species was also deter- mined in order to estimate their carbon requirements. Assuming a gross efficiency of egg production of 03, nanoplanktonic carbon ingested always met the carbon requirements suggesting that, most of the time, other carbon sources could be unnecessary. Nanoplankton ingestion by A.bifilosa (from 128 to 1693 cells ind.~' h~') was dominated by autotrophic forms (60-97%) and was seriously affected by high (>100 mg H) suspended particulate matter (SPM) concentrations. Nanoplankton ingestion by E.affinis (from 300 to 1049 cells ind."1 h~') was relatively stable in comparison, but this latter species seemed to switch its grazing pressure from autotrophic to heterotrophic forms when SPM concen- trations increased. Thus, two copepod species, living in the same estuary, presented two different feeding behaviours, probably to maximize energy input per unit of energy expenditure. Such differ- ences could contribute to the spatial and seasonal segregation of these species which is usually observed.

Autotrophic and heterotrophic nanoplankton in the diet of the estuarine copepods Eurytemora affinis and Acartia bifilosa