Mid-day photomixotrophy by <i>Roseiflexus</i> spp. and implications for the ¹³C content of hot spring cyanobacterial mats.

ABSTRACT: Microbial mats inhabiting extreme environments have been studied as modern analogs of stromatolites. Mats in Octopus Spring and Mushroom Spring, Yellowstone National Park, are predominated by unicellular photoautotrophic cyanobacteria (Synechococcus spp.), which are thought to cross-feed filamentous photoheterotrophic bacteria (mainly Roseiflexus spp.), except under early morning anoxic conditions when Roseiflexus spp. have been shown to fix dissolved inorganic carbon (DIC). Transcription patterns, however, suggest that Roseiflexus spp. may perform photomixotrophy, in which DIC is incorporated together with organic compounds during the daytime. We investigated the roles played by Synechococcus spp. and Roseiflexus spp. in DIC and organic matter upt

SUBMITTER: Moran JJ 

PROVIDER: S-EPMC12542760 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature