Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Trophic development of the deep lakes south of the Alps: a comparative analysis |
| Abstract | This paper reports the results of long-term research carried out in the deep southern subalpine lakes (DSL: Maggiore, Lugano, Como, Iseo and Garda). The measurements performed since the 1970s at the time of the maximum overturn documented an increase of water temperature around 0.012-0.028 °C yr-1, closely resembling the warming rate found in other lakes in Europe and North America. The DSL showed an increase of total phosphorus after the 1960s and a complete recovery after the 1990s of Lake Maggiore, which reached mean values of TP close to those of the pristine conditions (<10 ?g P l-1). Present TP concentrations in the other lakes are above 100 ?g P l-1 (Lugano), 30-40 ?g P l-1 (Como), 50-60 ?g P l-1 (Iseo) and c. 20 ?g P l-1 (Garda), with only Lake Garda showing a clear tendency to increasing P-concentrations in recent years. The higher trophic status of lakes Lugano and Iseo has favoured hypolimnetic anoxia due to meromixis since the 1960s and the 1990s, respectively, from which there was a partial recovery in 2005. Monthly samplings carried out in the last decades showed a strong coupling between long-term variation in algal nutrients and phytoplankton. On a shorter temporal scale, a signifi cant relationship between the extent of water mixing during the spring months and the replenishment of nutrients and algal biomass in the growing season has also been verifi ed in lakes Iseo, Garda and Lugano. |
| Source | Fundamental and applied limnology 170, pp. 177–196 |
| Keywords | long term researchdeep lakestrophic statuswater chemistryphytoplankton |
| Journal | Fundamental and applied limnology |
| Editor | Schweizerbart, Stuttgart, Germania |
| Year | 2007 |
| Type | Articolo in rivista |
| Authors | Salmaso N.(1), Morabito G., Garibaldi L.(2), Mosello R. |
| Text | 52977 2007 ISI Web of Science WOS 000251958200001 long term research deep lakes trophic status water chemistry phytoplankton Trophic development of the deep lakes south of the Alps a comparative analysis Salmaso N. 1 , Morabito G., Garibaldi L. 2 , Mosello R. 1 Istituto Agrario S. Michele All Adige, San Michele all Adige TN ; 2 Dipartimento di Scienze dell Ambiente e del Territorio, Universita Bicocca, Milano This paper reports the results of long term research carried out in the deep southern subalpine lakes DSL Maggiore, Lugano, Como, Iseo and Garda . The measurements performed since the 1970s at the time of the maximum overturn documented an increase of water temperature around 0.012 0.028 °C yr 1, closely resembling the warming rate found in other lakes in Europe and North America. The DSL showed an increase of total phosphorus after the 1960s and a complete recovery after the 1990s of Lake Maggiore, which reached mean values of TP close to those of the pristine conditions <10 g P l 1 . Present TP concentrations in the other lakes are above 100 g P l 1 Lugano , 30 40 g P l 1 Como , 50 60 g P l 1 Iseo and c. 20 g P l 1 Garda , with only Lake Garda showing a clear tendency to increasing P concentrations in recent years. The higher trophic status of lakes Lugano and Iseo has favoured hypolimnetic anoxia due to meromixis since the 1960s and the 1990s, respectively, from which there was a partial recovery in 2005. Monthly samplings carried out in the last decades showed a strong coupling between long term variation in algal nutrients and phytoplankton. On a shorter temporal scale, a signifi cant relationship between the extent of water mixing during the spring months and the replenishment of nutrients and algal biomass in the growing season has also been verifi ed in lakes Iseo, Garda and Lugano. 170 Articolo pubblicato Salmaso_et_al_2007_Arch_Hydrobiol_170_177_196.pdf Articolo in rivista Schweizerbart 1863 9135 Fundamental and applied limnology Fundamental and applied limnology Fundam. appl. limnol. Fundamental and applied limnology. Archiv fur Hydrobiologie 2007 giuseppe.morabito MORABITO GIUSEPPE rosario.mosello MOSELLO ROSARIO TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |