Abundance and activity of the N2 fixing unicellular Cyanobacterial symbiont UCYN-A at a Southern California coastal site: light and nutrient controls

Matthew M Mills1, Kendra A Turk-Kubo2, Samuel T Wilson3, Kevin R Arrigo1 and Jonathan P Zehr4, (1)Stanford University, Earth System Science, Stanford, CA, United States, (2)UC Santa Cruz, Ocean Sciences, CA, United States, (3)Daniel K. Inouye Center for Microbial Oceanography: Research and Education, University of Hawaii at Manoa, Honolulu, HI, United States, (4)UC Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States