A biogeochemical model of lake Pusiano (North Italy) and its use in the predictability of phytoplankton blooms: first preliminary results
| Autor: | COPETTI D., TARTARI G., MORABITO A., OGGIONI F., MARGARITORA E., LEGNANI E., IMBERG J. |
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| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | XIII Congresso SitE, Como, 8-10 settembre 2003 info:cnr-pdr/source/autori:COPETTI D., TARTARI G., MORABITO A., OGGIONI F., MARGARITORA E., LEGNANI E., IMBERG J./congresso_nome:XIII Congresso SitE/congresso_luogo:Como/congresso_data:8-10 settembre 2003/anno:2003/pagina_da:/pagina_a:/intervallo_pagine |
| Popis: | Lake Pusiano is a Northern Italian sub-alpine lake, with a depth around 24 m and a residence time of 0.8 yr. The lake surface and the catchment area are nearly 5 and 95 km$^2$ respectively. Despite a steady reduction of the nutrient concentration in the last 15 years (198 ?gP/l as TP during 1984 winter overturn against 74 ?gP/l in 2003), since 1994 the Pusiano has been affected by cyanobacteria's blooms. More recently the lake has been dominated by the cyanobacterium {\it Planktothrix rubescens} (more than 70 % of the phytoplankton population). The explanation for this dominance may have a number of reasons, such as a very efficient utilization of light gradients and nutrients patches and a low sensitivity to grazing pressure. Moreover, {\it Planktothrix} strains could be toxic, so the possibility to predict its development and its blooming may represent a great issue in the frame of lake management policies. In order to study the mechanism regulating the ecological behaviour of {\it Planktothrix} a two year long scientific monitoring plan (2002 and 2003) and an intensive field experiment (July 2003) has been performed. The aims of this research are to study the plankton succession during the year and the spatial distribution during stratification. The data collected are elaborated by coupling the ecological model CAEDYM with the hydrodynamic models DYRESM and ELCOM. The scientific approach and the preliminary results of the research will be presented in this work. |
| Databáze: | OpenAIRE |
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