Egg production by Acartia tonsa in Long Island Sound

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Abstract
The egg production of adult Acartia tonsa females in Long Island Sound, NY, during and after the fall bloom, was measured in short-term (8 h) incubations in natural seawater, and estimated from the egg-ratio method, using preserved samples of eggs and females. Egg production, as estimated from the in cubation technique, closely tracked changes in chlorophyll concentration with time. The fecundity estimates from the egg-ratio method were significantly lower than from the incubation method in September but were not significantly different in October. We suggest that a comparison of the egg production rates using these two techniques may be a useful way of gaining some insight into the extent of egg predation in the field. We attribute differences between egg ratio and incubation fecundities in September to ctenophore predation.

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