抄録
Green filamentous bacteria (Chloroflexus) and cyanobacteria are commonly observed in bacterial mats of hot springs with the temperature range betwen 45 and 70°C and pH range between 6.5 and 9.0. Sulfide concentration is another factor which largely affects the distribution of thermophilic photosynthetic bacteria. Chloroflexus spp. are thought to maintain many characteristics of the oldest photosynthetic bacteria. Photosynthetic bacterial mats in hot springs are important for the studies on early stages of the evolution of photosynthesis.
