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Prediction of Daphnia Production along a Trophic Gradient
C.R. Goldman (University of California)
Abstract
To predict Daphnia secondary productivity along a trophic gradient indexed as total phosphorus(TP) concentration, we estimated energy transfer efficiencies from food quality for Daphnia such as eicosa-Daphnia magna growth experiments were conducted with seston from 9 lakes, ponds and river waters. Primary productivities were estimated from food supply rates in the flow-through experiments, producing energy transfer efficiencies from seston to D. magna. We found DHA content was the best predictor of energy transfer efficiencies among the essential fatty acids. An asymptotic saturation model explained 79.6% of the variability in energy transfer effi-ciencies. Based on empirical data in this study and empirical models from literature, we predict that Daphnia productivity would peak in mesotrophic systems by decreasing food quality and increasing food quantity along trophic gradient.
- keywords
- Daphnia, DHA, Fatty acids, Flow-through experiment, Secondary productivity, TP, Trophic gradient
Reference
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