DNA, Analysis, Physiological aspects, Hypoxia, Genetic aspects, Phylogeny, Bacteria, Photosynthetic, Geography, rRNA 16S, Habitats, Communities, Hot springs, Photopigments, Aquatic habitats, Water springs, Gene sequencing, Coastal ecology, Microorganisms, Phototrophic bacteria, Next-generation sequencing, Deoxyribonucleic acid, Mats, Phylogenetics, Bacteria,...