Lake Maggiore loses oxygen at the bottom, because it rains little, so there is less movement.
On the other hand, the phenomenon of antibiotic resistance decreases. These are two of the aspects highlighted at the 51st meeting of the International Commission for the Protection of Italian-Swiss Waters (CIPAIS) which took place in Orta San Giulio (Novara) yesterday and today. The state of the lakes and rivers were under the magnifying glass of the research during the two days of work. The Commission was set up in 1972 with the signing of an agreement between Switzerland and Italy, with the aim of studying and monitoring the situation of the lakes (Lugano and Maggiore) and watercourses that mark or cross the border between the two states in the cantons of Ticino, Graubünden and Valais.
For Lake Maggiore, the second most studied lake in Europe after Lake Constance, research conducted by researchers at Irsa Cnr (Water Research Institute of the National Research Council) for the year 2022 showed that climate change, with the constant reduction of annual rainfall, a phenomenon more marked in spring and autumn, and the increase in average temperatures of both air and water, It leads to a significant reduction in the supply of water from the tributary rivers, therefore less movement of water at depth, with the consequent loss of oxygen to the bottom. On the nutrient side, there is a reduction in the various nitrogen compounds while the phosphorus value remains stable.
On the other hand, the most evident data is the constant decrease in the phenomenon of antibiotic resistance (i.e. the phenomenon for which a bacterium is resistant to the activity of a pharmacoantimicrobial, attributable to a large use of antibiotics), which has marked a great improvement since 2020 and which has been consolidated with the end of the Covid 19 pandemic, a decline most likely due to a more conscious use of some important antibiotics in the lake basin.
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