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High interspecific variability in trypsin and amylase activities of boreal n~acrozooplankton species, prevailing during an 8 mo investigation, could not be explained by differences in trophic position of the species. A pronounced but delayed response to the spnng phytoplankton bloom was recorded for herbivorous but not for carnivorous species. The 2 copepods Calanus finmarchicus and Metnda longa, having different Me strategies, showed significantly different enzyme activity during most of the investigation. The non-feedlng adult males of 2 carnivorous copepods showed a depressed trypsin activity but normal amylase activlty compared with feeding developmental stages. The copepod Chuidus armatus from Kosterfjorden, as well as from the Norwegian west coast, always displayed exceptionally high trypsin activity. A diurnal rhythm in enzyme activity, significantly correlated with the feeding activity and respiration rate, was recorded for Stage V copepodites Calanus finrnarchlcus studied in late September Results suggest that data on enzyme acbvities of mixed zooplankton samples cannot be used as a general indicator of zooplankton feeding levels. But for a given species the activities of digestive enzymes may reflect both long-term (seasonal) and short-term (diurnal) changes in feeding activities. However, the causal relationships between feedlng and enzyme activities appear very complex, and measurements of dlgeshve enzymes cannot be used as a direct quantitative method to esbmate ingestion rates of zooplankton.

Interspecific, seasonal and diel variations in zooplankton trypsin and amylase activities in Kosterfjorden, western Sweden