Effects of disturbance on phosphorus turnover and plankton dynamics |
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| Authors: | Panosso, R. Esteves, F.A. |
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| Affiliation: | Department of Limnology, Lund University, Ecology Building, Lund, 22362, Sweden and 1 Departamento de Ecologia, Universidade Federal do Rio de Janeiro, Ilha do Fundão, CCS, 21941–540, Rio de Janeiro, Brazil |
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| Abstract: | In coastal lagoons, one common type of anthropogenic disturbanceis opening of the sand barriers that isolate these lagoons fromthe sea. We investigated how a disturbance caused by an artificialopening of the sand barrier affects phytoplankton and bacterioplanktondynamics and alkaline phosphatase activities (APA) in a Braziliancoastal lagoon. We propose an index of potential phosphorusturnover time (PPTT) calculated as the ratio of total phosphorus(TP) and APA in an attempt to quantify the effect of disturbanceson phosphorus recycling within the plankton community. Openingthe barrier caused increased phytoplankton biomass, TP concentrations,APA and PPTT, and decreased bacteria to phytoplankton biomassratio. PPTT is easily calculated and may be used to detect planktonresponses to anthropogenic disturbances. |
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