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 |
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Authors: | Elisa Carraro Nicolas Guyennon David Hamilton Lucia Valsecchi Emanuela C Manfredi Gaetano Viviano Franco Salerno Gianni Tartari Diego Copetti |
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Institution: | 1. Water Research Institute, Via del Mulino 19, 20861, Brugherio, MB, Italy 2. Water Research Institute, Via Salaria km 29, 300 C.P. 10 Monterotondo St., 00015, Rome, Italy 3. Department of Biological Sciences, University of Waikato, Private Bag 3105, Hamilton, 3240, New Zealand
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Abstract: | 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. |
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