The relationships between survivorship and fecundity of Diaptomus pakdus and algal food concentrations (Cryptomonas reflexa) were examined with a flow-through system that prevents the depletion and settling of algal cells. Egg production in adult females increased with increasing food concentration up to a maximum at 600 pg dry wt liter-*. Under starvation conditions, egg production stopped and survival decreased, whereas at 60 pg dry wt liter-l production was halted and survival was high. Adults survived longer under conditions of starvation than did nauplii. Adult survival was high at all food concentrations; naupliar survival was highest at 60 pg dry wt liter-*, slightly lower at 600 pg dry wt liter-l, and much lower at 6,000 pg dry wt liter-l. Naupliar development was faster at 600 and 6,000 pg dry wt liter-l than at 60 pg dry wt liter-l.
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