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Carlsson, Per; Granéli, Edna; Granéli, Wilhelm; Rodriguez, Eliane Gonzalez; de Carvalho, Wanderson Fernandes; Brutemark, Andreas; Lindehoff, Elin
Journal of experimental marine biology and ecology, 05/2012, Letnik: 418-419Journal Article
Bioassay experiments were performed two times (with 2years in between) in order to investigate if nitrogen (N, ammonium), phosphorus (P, phosphate) and carbon (C, glucose) additions would stimulate the growth of bacteria and phytoplankton differently in three different tropical aquatic environments. The water and their indigenous microbial communities were taken from a freshwater coastal lake (Cabiunas), a coastal (Anjos), and an offshore marine station (Sonar) in the Atlantic outside Cabo Frio, Rio de Janeiro State, Brazil. Ammonium, phosphate and glucose were added alone or in combination to triplicate bottles. In the lake, P seemed to be the primary limiting factor during the first experiment, since both bacterial production and phytoplankton growth was stimulated by the P addition. Two years later, however, addition of P inhibited phytoplankton growth. During both years, C was closely co-limiting for bacteria since CP additions increased the response considerably. For both the coastal and offshore seawater stations, phytoplankton growth was clearly stimulated by N addition in both years and the bacteria responded either to the P, N or C additions (alone or in combination). To conclude, the results from these tropical aquatic systems show that it is possible that phytoplankton and bacteria may compete for a common resource (P) in lakes, but can be limited by different inorganic nutrients in marine waters as well as lakes, suggesting that phytoplankton and bacteria do not necessarily compete for the same growth limiting nutrient in these environments. ► Phytoplankton and bacterial nutrient limitation was investigated in tropical waters. ► Phytoplankton and bacteria may compete for a common resource (P) in a tropical lake. ► Phytoplankton and bacteria can be limited by different nutrients in marine waters. ► Phytoplankton and bacteria do not necessarily compete for the same nutrient.
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