Journal
OECOLOGIA
Volume 129, Issue 3, Pages 342-348Publisher
SPRINGER
DOI: 10.1007/s004420100728
Keywords
assimilation; highly unsaturated fatty acids; fatty acid; phosphorus; seasonal dynamics
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The quality of natural seston as food for zooplankters can be highly variable. Thus far, experimental evidence on the factors affecting food quality under natural conditions is scarce. Hence, in this study, we set out to investigate how Daphnia galeata x hyalina responded to qualitative variation in natural seston. This was done in laboratory experiments where we supplement natural seston from a mesotrophic lake with dissolved phosphorus and emulsions of highly unsaturated essential fatty acids. The growth rate of juveniles increased upon the supply of both phosphorus and fatty acids. These results suggest that these phosphorus and highly unsaturated fatty acids are substitutable and thus challenge our existing interpretation/understanding of how herbivore growth is limited.
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