Phytoplankton phosphorus limitation and food quality for Bosmina

Article Abstract:

Phytoplankton phosphorus (P) limitation is discussed as it relates to food quality for Bosmina, a common anomopod zooplankter with a lower percentage of P in its body than Daphnia has. Bosmina and Daphnia were raised on P-deficient or P-sufficient Scenedesmus acutus in two concentrations. Bosmina growth and fecundity were not affected, but for Daphnia results were different. Bosmina may process P more efficiently or better survive having a low-P body. In competition, the low-P-content zooplankton might do better.

Research, Algae, Homeostasis

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Phosphorus limitation in Daphnia: evidence from a long term study of three hypereutrophic Dutch lakes

Article Abstract:

Phosphorus (P) limitation in Daphnia is discussed based on evidence from a long-term study of hypereutrophic Dutch lakes in which eutrophication was due largely to high P loading from the outside. It appears that Daphnia abundance in the lakes was greatly constrained by the seston carbon:phosphorus (C:P) ratio and that other coexisting zooplankton species were less sensitive to P limitation. It is possible that other factors that influence food quality covaried with the seston C:P ratio.

Netherlands, Cyanobacteria, Eutrophication

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Effects of phosphorus-deficient diets on the carbon and phosphorus balance of Daphnia magna

Article Abstract:

An increase in the carbon:phosphorus ratio of the diet causes a decreased efficiency of carbon assimilation in Daphnia magna, as shown by experiments with dual-labeled (14C/32P) Scenedesmus. Daphnia acts as a strong sink for phosphorus (P) when intermediate levels of P deficiency occur in food resources. Both P-rich and strongly P-deficient resources lead to reduction in P gross growth efficiency.

Food and nutrition, Carbon, Cladocera

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