THRESHOLDS FOR GROWTH IN DAPHNIA-MAGNA WITH HIGH AND LOW PHOSPHORUS DIETS

Algae that have a low growth rate with a low mineral content are inferior foods for Daphnia growth, but these foods are not inferior for maintenance metabolism. The C per unit volume of low-growth-rate algal food necessary for zero body growth was similar to that of high-growth-rate food. Maintenance metabolism requires mainly energy, while body growth requires other essential substances; thus, they are separate influences of food quality.