Lake Cadagno in the southern swiss alps has a speciality: Salty spring at the lake bottom prevent mixing, resulting in a stable stratification. The upper 11 metres contains oxygen but little nutrients (phosphate and ammonium). The bottom layer is enriched in nutrients. A stable intermediate layer shows steep gradients of oxygen, sulphate and sulfide. There the three investigated microbial species use light energy to oxidize sulfide.
Source: Photo: Sandro Peduzzi
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