Lake Cadagno

Lake Cadagno is a rare example of crenogenic meromixis. Its waters show a permanent stratification due to a natural geological phenomenon. The lower abounds with dissolved mineral salts (sulphate, magnesium, calcium, carbonate) originating from sublacustrine springs, whereas the separate upper layer is permanently oxygenated. Anaerobic phototrophic bacteria – among them Chromatium okenii—thrive between the two layers where they find the ideal conditions for their development. Such an ecosystem provides a good opportunity to study the metabolisms connected with eutrophication on a stable model, as it is well known that one of the advanced stages of eutrophication is biogenic meromixis.

Research

For the last 25 years the area has been increasingly used for scientific purposes, both for teaching and researching various environmental subjects. In view of stimulating educational and scientific activities at a university level, the Alpine Biology Center (ABC) has been set up by the Canton of Ticino, in cooperation with the universities of Geneva and Zurich. For this purpose, two 16th-century buildings of the Alpe Piora have been turned into a laboratory and lodgings. The Microbiology Institute of the canton of Ticino is responsible both for managing the center and coordinating its activities.

Cyclobotryococcatriene, a botryococcene-related hydrocarbon, was isolated from and identified in organic-rich sediments in Lake Cadagno in 2000.