Purple and green(Anoxygenic Phototrophic) Bacteria Purple sulfur bacteria deposit sulfur and oxidize it to sulfate, commonly found in anoxic zones of lakes as well as In sulfur springs, Ectothiorhodospira deposits sulfur externally, grows halophilically and at high ph, found in saline lakes, saltern, and bodies of water high in salt limited ability to utilize organic compounds as C source for phototrophic growth Thiocapsa grows chemoorganotrophically on acetatePurple and Green (Anoxygenic Phototrophic) Bacteria Purple sulfur bacteria deposit sulfur and oxidize it to sulfate, commonly found in anoxic zones of lakes as well as in sulfur springs, Ectothiorhodospira deposits sulfur externally, grows halophilically and at high pH, found in saline lakes, saltern, and bodies of water high in salt, limited ability to utilize organic compounds as C source for phototrophic growth Thiocapsa grows chemoorganotrophically on acetate