The Johnson Lab broadly studies the abundance, diversity and activity of marine microbes. We are biological (microbial) oceanographers, marine molecular ecologists, marine microbiologists, phycologists, and biogeochemists.  Our environmental research, which is at the intersection of marine ecology and biogeochemistry, focuses on the marine cyanobacteria Prochlorococcus, the most abundant phytoplankton in the open oceans and an excellent model marine microbe.  We also have substantial efforts in the biotechnological application of marine microalgae for aquaculture/aquaponics towards the sustainable production of feed, food and fuel.  We are at the Marine Laboratory, which is part of the Nicholas School of the Environment at Duke University.