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TitleCoupling high-resolution measurements to a three-dimensional lake model to assess the spatial and temporal dynamics of the cyanobacterium Planktothrix rubescens in a medium-sized lake
AbstractIn a medium-sized pre-alpine lake (North Italy) the cyanobacterium Planktothrix rubescens has strongly dominated the phytoplankton assemblage since 2000, similar to many pre-alpine lakes, despite improvements in water quality. The objective of this study was to determine the factors governing the spatial distribution of P. rubescens, including the major hydrodynamic processes and the influence of long-term reduction in nutrient concentrations during a period of climate warming. We used an intensive field campaign conducted from February 2010 to January 2011, to evaluate distributions of phytoplankton phyla, as well as P. rubescens, using spectrally resolved fluorescence measurements. These data provided highly spatially and temporally resolved phytoplankton population data suitable to calibrate and validate a coupled three-dimensional hydrodynamic (ELCOM) and ecological model (CAEDYM) of the lake ecosystem. The simulations revealed the fundamental role of physiological features of P. rubescens that led to observed vertical patterns of distribution, notably a deep chlorophyll maximum, and a strong influence of lake hydrodynamic processes, particularly during high-discharge inflows in summer stratification. The simulations are used to examine growth-limiting factors that help to explain the increased prevalence of P. rubescens during re-oligotrophication.
SourceHydrobiologia (The Hague. Print) 698 (1), pp. 77–95
KeywordsMetalimnionHydrodynamicsDeep chlorophyll maximumPhytoplanktonELCOM-CAEDYM
JournalHydrobiologia (The Hague. Print)
EditorKluwer Academic Publishers, Boston, Paesi Bassi
Year2012
TypeArticolo in rivista
DOI10.1007/s10750-012-1096-y
AuthorsCarraro, Elisa; Guyennon, Nicolas; Hamilton, David; Valsecchi, Lucia; Manfredi, Emanuela C.; Viviano, Gaetano; Salerno, Franco; Tartari, Gianni; Copetti, Diego
Text346771 2012 10.1007/s10750 012 1096 y ISI Web of Science WOS 000309345700007 Metalimnion Hydrodynamics Deep chlorophyll maximum Phytoplankton ELCOM CAEDYM Coupling high resolution measurements to a three dimensional lake model to assess the spatial and temporal dynamics of the cyanobacterium Planktothrix rubescens in a medium sized lake Carraro, Elisa; Guyennon, Nicolas; Hamilton, David; Valsecchi, Lucia; Manfredi, Emanuela C.; Viviano, Gaetano; Salerno, Franco; Tartari, Gianni; Copetti, Diego Water Res Inst; Water Res Inst; object Object In a medium sized pre alpine lake North Italy the cyanobacterium Planktothrix rubescens has strongly dominated the phytoplankton assemblage since 2000, similar to many pre alpine lakes, despite improvements in water quality. The objective of this study was to determine the factors governing the spatial distribution of P. rubescens, including the major hydrodynamic processes and the influence of long term reduction in nutrient concentrations during a period of climate warming. We used an intensive field campaign conducted from February 2010 to January 2011, to evaluate distributions of phytoplankton phyla, as well as P. rubescens, using spectrally resolved fluorescence measurements. These data provided highly spatially and temporally resolved phytoplankton population data suitable to calibrate and validate a coupled three dimensional hydrodynamic ELCOM and ecological model CAEDYM of the lake ecosystem. The simulations revealed the fundamental role of physiological features of P. rubescens that led to observed vertical patterns of distribution, notably a deep chlorophyll maximum, and a strong influence of lake hydrodynamic processes, particularly during high discharge inflows in summer stratification. The simulations are used to examine growth limiting factors that help to explain the increased prevalence of P. rubescens during re oligotrophication. 698 Published version Carraro_et_al_2012_Hydrobiologia Carraro_et_al_2012_Hydrobiologia.pdf Articolo in rivista Kluwer Academic Publishers 0018 8158 Hydrobiologia The Hague. Print Hydrobiologia The Hague. Print Hydrobiologia The Hague. Print Hydrobiologia. The Hague. Print Hydrobiologia Dordrecht The Hague. Print Hydrobiologia Boston The Hague. Print Hydrobiologia London The Hague. Print lucia.valsecchi VALSECCHI LUCIA MANFREDI EMANUELA CHIARA CARRARO ELISA diego.copetti COPETTI DIEGO franco.salerno SALERNO FRANCO nicolasdominique.guyennon GUYENNON NICOLAS DOMINIQUE gaetano.viviano VIVIANO GAETANO gianni.tartari TARTARI GIANNI