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Changes in phosphorus and nitrogen cycling following food web manipulations in a shallow Dutch lake
Author(s) -
VAN DER MOLEN DIEDERIK,
BOERS PAUL
Publication year - 1996
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1046/j.1365-2427.1996.00488.x
Subject(s) - macrophyte , eutrophication , biomanipulation , food web , zooplankton , phosphorus , environmental science , nutrient , water column , biomass (ecology) , benthic zone , nutrient cycle , ecology , biology , predation , chemistry , organic chemistry
1. The flow of phosphorus and nitrogen through the food web of the shallow, eutrophic lake Wolderwijd was analysed for 2 different years before and for 1 year after food web manipulation. 2. After fish removal the water became clear and the growth of macrophytes began. Fish removal resulted in a significant reduction of the total nutrient pool in the water, but differences between the nutrient cycles before and after the experiment were mainly caused by a gradual change driven by a reduced phosphorus input. 3. The zooplankton biomass before and after food web manipulation did not change significantly. Unfavourable food conditions and predation by young fish limited zooplankton biomass after the food web manipulation. 4. After fish removal benthic algae, fish, zoobenthos and macrophytes form the largest pools of nutrients apart from the sediment top layer. However, they contribute only little to nutrient cycles in the water column.