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The copepod community of the Pomeranlan Bay, in the outer part of the Oder Estuary (Southern Baltic Sea), 1s dominated by Acartia bifilosa Glesbrecht In winter and spring and by A. tonsa Dana In autumn. During summer both species CO-occur. The egg production of these species was studled in 1994/1995. Rates (eggs female-' d-l) were found to vary both seasonally and spatially. In winter, egg production rates of A bifilosa were low, but showed a posltive response to increasing chlorophyll a concentrations. During the late phase of the spnng bloom (dominated by the diatom Skeletonema costatum), egg production of A. blfilosa was clearly higher than in winter, while water temperature r ema~ned at a low level. Phytoplankton concentrations dunng the spnng bloom varied, but egg production rates were uniform all over the bay, suggesting production was not food limited. Length-specific weight and l i p ~ d content indicate that females were in good physiological condition. Dunng summer and autumn, both high and very low egg production rates were observed for both species. The relation between egg production rate dnd chlorophyll a concentration was negative. The analysis of the phytoplankton composltlon in summer suggested that a hlgh proportion of dinoflagellates was beneficial for egg production whereas high proportions of cyanobactenal colonies and filaments had negatlve effects Except dunng the spnng bloom penod, the egg production of Acartia spp, in the Pomeranian Bay was llrnited by the amount and quality of phytoplankton.

Copepod egg production rates in the Pomeranian Bay (Southern Baltic Sea) as a function of phytoplankton abundance and taxonomic composition