Abstract
In Vila (meromictic) and Siso (holomictic) lakes, two populations of green (Chlorobium phaeobacteroides) and purple (Chromatium minus) sulfur bacteria have different ecological niches mostly determined by sulfide concentration and light climate. The total numbers, vertical distribution and physiological characteristics (specific pigment contents and carotenoid/bacteriochlorophyll ratio) of both populations, together with the main physico-chemical and morphometric parameters are compared in the two lakes. Optical properties of water, such as light penetration and turbidity, are affected by the presence of dense populations of bacteria, which strongly modify the quality and quantity of available light. Photosynthetic bacterial populations in nature adapt to decreasing available light by increasing the specific content of bacteriochlorophylls and carotenoids. This, with the ability to move vertically in the water column, makes it possible to adapt to the underwater light climate at each depth.
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