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Oligotrophication and emergence of picocyanobacteria and a toxic dinoflagellate in Thau lagoon, southern France ArchiMer
Collos, Yves; Bec, Beatrice; Jauzein, Cecile; Abadie, Eric; Laugier, Thierry; Lautier, Jacques; Pastoureaud, Annie; Souchu, Philippe; Vaquer, Andre.
Time series data have been examined in Thau lagoon (Southern France) from 1972 to 2006 for water temperature, salinity, nutrients and from 1987 to 2006 for phytoplankton. A first main trend identified is an increase in mean annual water temperature (1.5 degrees C over 33 years or 0.045 degrees C/year) that was not evenly distributed among seasons. The highest rate of increase was in the spring (+ 3.0 degrees C over 33 years), followed by summer (+ 2.0 degrees C and fall (+ 1.7 degrees C. In winter, no significant increase over the 33 year period could be found. A second clear trend is a large decrease in soluble reactive phosphorus (SRP) concentration over the same 33 year period (summer values decreased from 10 mu M to 1 mu M. while winter values...
Tipo: Text Palavras-chave: Skeletonema costatum; Alexandrium catenella; Picocyanobacteria; Oligotrophication; Long term variability; Thau lagoon.
Ano: 2009 URL:
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