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Olsen, Yngvar; Jensen, Arne; Reinertsen, Helge; BOersheim, Knut Yngve; Heldal, Mikal; Langeland, Arnfinn
Limnology and oceanography, 01/1986, Volume: 31, Issue: 1Journal Article
In two enclosure experiments, Daphnia pulex ingested cryptophytes, bacteria, and probably detritus particles. The specific clearance rate of the zooplankton increased when the concentration of food decreased. The P : C ratio of the food also increased. More than 92% of the particulate phosphorus was located in the living cells (algae and bacteria); the detritus was practically phosphorus-free. The specific release rate of phosphorus estimated for the daphnids by use of the recycling model increased as the P : C ratio of the food increased and became zero at a critical low P : C ratio, Q, of 6-8 mu g P mg super(-1) C. At this concentration, all the ingested phosphorus is needed for growth and reproduction, and no release of the element can be expected. This indicates that Daphnia may experience P limitation in nature, since the P : C ratio of P-starved algae and detritus may be considerably <6-8 mu g P mg super(-1) C. The use of mass balance also appears to be suitable for modeling phosphorus and carbon fluxes super(through zooplankton in pelagic ecosystems.)
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