From Professor Stjepko Golubic's Lab

[http://people.bu.edu/golubic/]

(Click on a photo to see a larger version)

Great Sippewissett Marsh. Experimental plots have been chronically enriched for 35 years.

Exploration of nitrogen fixation in tropical coral reefs: Mayotte, Comores. (S. Golubic).

Cyanobacteria have invented oxygenic photosynthesis, and fix carbon as well as nitrogen in nutrient poor marine benthic environments. Hydrocoluem holdenii fixes nitrogen by night.

Hydrocoleum holdenii

Nodularia harveyana fixes nitrogen by day.

Nodularia harveyana.