Grazer control of nitrogen fixation: synergisms in the feeding ecology of two freshwater crustaceans
Hambright, K.D.; Hairston, N.G.; Schaffner, W.R.; Howarth, R.W.
published: Dec 18, 2007
ArtNo. ESP141017002001, Price: 29.00 €
Using in situ mesocosm experiments, we compared grazing rates, food-selection patterns and nutrient mineralization rates of a daphniid cladoceran and a diaptomid copepod to determine their influence on phytoplankton composition and the prevalence of N-fixing cyanobacteria. We show that grazing and nutrient mineralization may act synergistically within a grazer taxon. Cladocerans exhibited non-selective grazing and high N:P mineralization; copepods exhibited selective grazing and low N:P mineralization. Through such synergistic effects, freshwater systems dominated by copepods would be expected to be more vulnerable to blooms of N-fixing cyanobacteria than those dominated by cladocerans.