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Variability of microcystin cell quota in metapopulations of Planktothrix rubescens : Causes and implications for water management

Variability of microcystin cell quota in metapopulations of Planktothrix rubescens : Causes and implications for water management

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SALMASO, Nico, Diego COPETTI, Leonardo CERASINO, Shiva SHAMS, Camilla CAPELLI, Adriano BOSCAINI, Lucia VALSECCHI, Fiorenzo POZZONI, Licia GUZZELLA, 2014. Variability of microcystin cell quota in metapopulations of Planktothrix rubescens : Causes and implications for water management. In: Toxicon. 90, pp. 82-96. ISSN 0041-0101. eISSN 1879-3150

@article{Salmaso2014Varia-30196, title={Variability of microcystin cell quota in metapopulations of Planktothrix rubescens : Causes and implications for water management}, year={2014}, doi={10.1016/j.toxicon.2014.07.022}, volume={90}, issn={0041-0101}, journal={Toxicon}, pages={82--96}, author={Salmaso, Nico and Copetti, Diego and Cerasino, Leonardo and Shams, Shiva and Capelli, Camilla and Boscaini, Adriano and Valsecchi, Lucia and Pozzoni, Fiorenzo and Guzzella, Licia} }

In this study, we investigated the relationships between microcystin (MCs) concentrations and the biovolumes of Planktothrix rubescens (B<sub>Pr</sub>) in 2 natural lakes (Pusiano and Garda) and 2 artificially dammed reservoirs (Occhito and Ledro) in Italy. In all the considered water bodies, P. rubescens was the dominant cyanobacterium. All the lakes were characterized by significant relationships between MCs and B<sub>Pr</sub>, with limited variability in the MC quota (the content of MCs per unit of biovolume) within each water body compared with the variability between sites. The results were consistent with the development of specific MC-genotypes, with moderate seasonal and spatial changes in the proportion between toxic and non-toxic strains. The MC cell quota obtained in our work (ECQ, Environmental Cell Quota) were in the same range of values computed on the basis of analyses made on environmental samples dominated by P. rubescens or Planktothrix agardhii, and on isolates of the same two species (<1 to over 10 μg mm<sup>−3</sup>). Besides the usual ordinary least square regressions, models have been evaluated by using quantile regression, a method that allows estimating the conditional median or other quantiles of the response variable. We showed that the use of quantile regressions has different advantages, which included the computation of MC quota based on the whole range of available data, the robustness against outliers, and the ability to estimate models also in cases where there is no or only weak relationships. The highest ECQ values estimated from 95% quantile regressions in specific water bodies might be used to estimate the worst-case MC concentrations from algal abundances. Nevertheless, it was stressed that a realistic assessment of toxicity and potential adverse health effects necessarily should take into account the toxicity potential of the more abundant MC-congeners produced by specific cyanobacteria populations. Salmaso, Nico Valsecchi, Lucia Guzzella, Licia 2015-03-11T10:54:04Z Guzzella, Licia Cerasino, Leonardo Variability of microcystin cell quota in metapopulations of Planktothrix rubescens : Causes and implications for water management Cerasino, Leonardo Copetti, Diego Valsecchi, Lucia Copetti, Diego Capelli, Camilla 2015-03-11T10:54:04Z eng Pozzoni, Fiorenzo Shams, Shiva Salmaso, Nico Shams, Shiva Capelli, Camilla Pozzoni, Fiorenzo 2014 Boscaini, Adriano Boscaini, Adriano

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