Judith M. Klatt

The paper studies seasonal changes in a modern microbialite reef, finding that environmental fluctuations drive microbial community shifts and mineralization patterns, indicating metabolic drivers over taxonomy in carbonate precipitation.

The paper shows cyanobacteria in microbial mats switch from oxygenic to arsenite-driven anoxygenic photosynthesis under high light, revealing a cryptic arsenic redox cycle that may have influenced early Earth oxygenation.

The paper measures high oxygen concentrations in microbial mats and biofilms, showing O2 oversaturation is stable and does not disrupt mat structure, with implications for photobioreactor design.