Journal
FUNDAMENTAL AND APPLIED LIMNOLOGY
Volume 170, Issue 2, Pages 89-101Publisher
E SCHWEIZERBARTSCHE VERLAGS
DOI: 10.1127/1863-9135/2007/0170-0089
Keywords
cladocera; copepod; grazing; cyanobacteria; mesocosms; nitrogen to phosphorus ratio
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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.
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