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Effects of algal food quality on fecundity and population growth rates of Daphnia
Authors:SUSAN KILHAM,DANIEL KREEGER,CLYDE GOULDEN,&   SCOTT LYNN
Affiliation:Department of Bioscience and Biotechnology, 32nd and Chestnut St., Drexel University, Philadelphia, PA 19014, U.S.A.,;Academy of Natural Sciences, 19th and The Parkway, Philadelphia, PA 19103, U.S.A.
Abstract:1. Food quality was at least as important as food quantity for both fecundity and population growth responses of the cladoceran Daphnia pulicaria fed the green alga Ankistrodesmus falcatus grown under N limitation, P limitation, or non-limited condition.
2. The fecundity of D. pulicaria was reduced under conditions of low food quality (low N or low P) compared with that for animals fed control non-limited algae regardless of ration size. The reduced fecundity of D. pulicaria fed P-limited food could be partially alleviated by increasing the ration (hence, compensation), but such was not the case for animals fed N-limited food.
3. Population growth rates of D. pulicaria ( r max) were significantly reduced under conditions of low-quality food for both N-limited and P-limited algae. Population growth rates were unaffected by ration size, indicating no compensation.
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