Marine unicellular Cyanobacteria of the Synechococcus group occupy an important position at the base of the marine food chain. They are abundant in the world s oceans and as a result are one of the most numerous genomes on earth. They have the ability to acquire major nutrients and trace metals from the sub-micromolar concentrations found in the oligotrophic open seas and theiSynechococcus light-harvesting apparatus is uniquely adapted to the spectral quality of light in the ocean. Synechococcus utilizes Chlorophyll-A. Marine unicellular Cyanobacteria are responsible for an estimated 20-40 percent of Chlorophyll biomass and [...]