Lipid storage in Diaptomus kenai (Copepoda; Calanoida): effects of inter- and intraspecific variation in food quality

In nature, changes in nutrient levels and phytoplankton community structure can represent variation in food quality and quantity. Because zooplankton can be highly susceptible to starvation, individuals could enhance their survival, growth, and reproduction during periods of unfavorable food conditions by maintaining and utilizing energy stores. Patterns of lipid accumulation and depletion in Diaptomus kenai, a calanoid copepod from an oligotrophic montane lake, were monitored over a variety of food conditions. The results suggest that, while lipid storage in D. kenai is affected by phytoplankton community structure and abundance, total lipid stores respond more to gradual changes in food regime than to sudden changes in food supply.