@article{mbs:/content/journal/micro/10.1099/00221287-129-6-1849, author = "Van Run, Jaap and Cohen, Yehuda", title = "Ecophysiology of the Cyanobacterium Dactylococcopsis salina: Effect of Light Intensity, Sulphide and Temperature", journal= "Microbiology", year = "1983", volume = "129", number = "6", pages = "1849-1856", doi = "https://doi.org/10.1099/00221287-129-6-1849", url = "https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-129-6-1849", publisher = "Microbiology Society", issn = "1465-2080", type = "Journal Article", abstract = " Dactylococcopsis salina is a planktonic gas-vacuolated cyanobacterium that forms a distinct bacterial plate at the metalimnion of Solar Lake, Sinai. Temperature, light intensity and sulphide concentration were examined as possible limiting factors determining the distribution of D. salina during the annual limnological cycle of Solar Lake. Both laboratory cultures and in situ samples were examined for their photosynthetic activity at a wide range of temperature, light intensity and sulphide concentrations. The cyanobacterium showed a considerable light adaptation and a capacity for photosynthetic activity at high light intensities. It also showed anoxygenic photosynthesis using H2S as an alternative electron donor, but this activity was only 4% of oxygenic photosynthesis. Furthermore, H2S was highly toxic to D. salina and no CO2 photoassimilation could be detected at pH 7 and 1 mm-sulphide. Temperature is the primary environmental factor governing the distribution of D. salina in Solar Lake.", }