Tutela ambientale del Lago Trasimeno - ARPA Umbria

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6 . S i n t e s i e d a t i 8 7 Seconda parte Ecologia Sintesi Le valutazioni ecologiche sviluppate sono quelle delle diverse componenti della vegetazione acquatica e spondale. Sono state analizzate la struttura e la composizione del popolamento fitoplanctonico del lago Trasimeno negli ultimi 50 anni al fine di comprenderne l’evoluzione nel lungo periodo. Tale analisi ha evidenziato la tendenza ad un’accentuata monotonia del popolamento fitoplanctonico attuale con assoluta dominanza di poche specie, ricordando quella dei laghi piatti subtropicali eutrofi: netta dominanza di cianobatteri per gran parte dell’anno, tranne nei mesi invernali in cui le cloroficee assumono un’importanza rilevante. La riduzione del livello idrico, con riduzione della trasparenza e aumento della temperatura, sembrano essere i fattori che determinano tale fisionomia. Valutare l’azione delle forze top-down sulla struttura di tutta la comunità planctonica sarebbe opportuno al fine di programmare interventi di biomanipolazione del Trasimeno. La caratterizzazione delle macrofite presenti nel lago Trasimeno, eseguita nel 2010 in ottemperanza alla Direttiva Quadro sulle Acque, ha permesso di sperimentare l’applicabilità del metodo, elaborare una prima valutazione delle condizioni trofiche del lago ed Summary An ecological evaluation was made of the different components of aquatic and shore vegetation. The structure and composition of the phytoplankton population in Lake Trasimeno have been analyzed over the last 50 years in order to understand the long-term evolution. This analysis shows a tendency to a marked lack of variety in the current phytoplankton population, with a few species predominating completely. The situation is similar to that of subtropical eutrophic shallow lakes; there is a clear predominance of cyanobacteria during most of the year, except in the winter months when the Chlorophyceae population becomes substantial. The causes seem to be the decrease in the water level, along with decreased transparency and increased temperatures. It would be useful to evaluate the effect of top-down forces on the structure of all the planktonic communities in order to plan biomanipulation of Lake Trasimeno. Individuation of the macrophytes present in Lake Trasimeno, carried out in 2010 in conformity with the Water Framework Directive, enabled us to test the method’s applicability, make a preliminary evaluation of the trophic conditions of the lake, and show the variations the hydrophytic flora have undergone over the years. The macrophyte
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Libri/Arpa Umbria
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Tutela ambientale del lago Trasimen
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Tutela ambientale del Lago Trasimeno - ARPA Umbria

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