BN34B:
New Insights into Marine N2 Fixation: From Single Cells to Ecosystems II Posters


Session ID#: 27975

Session Description:
The availability of combined nitrogen (N) influences the productivity of marine environments. The main source of N to the open ocean is biologically-mediated dinitrogen (N2) fixation. Our understanding of N2 fixation has greatly increased in the past two decades, including recognizing new habitats, new organisms, and new lifestyles of the microbes carrying out this process. Methodological developments and improvements, e.g., single-cell techniques and isotope tracer experiments, have enhanced our capabilities to better quantify bulk N2 fixation rates and to assess the contributions of individual organisms and the environmental regulation. Despite the known importance of N2 fixation for marine productivity, there is, however, still a lack of knowledge about which N2 fixers are biogeochemically relevant in most regions of the world ocean, how variable the activity is spatially and temporally, which factors influence the activity and distribution in the environment, and whether N2 fixation in the modern ocean can quantitatively account for oceanic N loss. This session invites contributions from biogeochemists, microbial ecologists, and oceanographers to share new insights on marine N2 fixation at the single-cell, population, ecosystem and global level including experimental, observation and modeling approaches.
Primary Chair:  Wiebke Mohr, Max Planck Institute for Marine Microbiology, Biogeochemistry, Bremen, Germany
Co-chairs:  Sven Alexander Kranz, Rice University, Department of Biosciences, Houston, United States and Angela N Knapp, Florida State University, Earth, Ocean, and Atmospheric Sciences, Tallahassee, FL, United States
Moderators:  Sven Alexander Kranz, Rice University, Department of Biosciences, Houston, United States and Angela N Knapp, Florida State University, Earth, Ocean, and Atmospheric Sciences, Tallahassee, FL, United States
Student Paper Review Liaison:  Sven Alexander Kranz, Rice University, Department of Biosciences, Houston, United States
Index Terms:

4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4815 Ecosystems, structure, dynamics, and modeling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4845 Nutrients and nutrient cycling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4870 Stable isotopes [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
Cross-Topics:
  • ME - Marine Ecosystems
  • OM - Ocean Modeling
  • PC - Past, Present and Future Climate

Abstracts Submitted to this Session:

Nitrogen Fixation in Two Contrasting Coastal Upwelling Regions of the Taiwan Strait (302575)
Zuozhu Wen1, Wenfang Lin2, Rong Shen2, Haizheng Hong1, Shuh-Ji Kao2 and Dalin Shi2, (1)Xiamen University, State Key Laboratory of Marine Environmental Science, Xiamen, China, (2)Xiamen University, Xiamen, China
Contribution of diazotrophs to the epipelagic grazing food chain in the subtropical mid-Pacific (308212)
Ken Furuya, Soka University, Hachioji, Japan, Sachiko Horii, The University of Tokyo, Department of Aquatic Bioscience, Tokyo, Japan, Kazutaka Takahashi, The University of Tokyo, Graduate School of Agricultural and Life Sciences, Tokyo, Japan, Takuhei Shiozaki, JAMSTEC, Yokosuka, Japan and Fuminori Hashihama, Tokyo University of Marine Science and Technology, Minato-ku, Japan
Dissolved phosphorus compounds enhance N2 fixation rates in the eastern tropical North Atlantic (308302)
Judith Meyer1, Arvind Singh2,3 and Ulf Riebesell1, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, Germany, (3)Physical Research Laboratory, Ahmedabad, India
Glucose and light as controls on nitrogen fixation rates in sea ice-covered Arctic waters (310959)
Allison A. Fong1, Raes Raes1 and Anya M Waite2, (1)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, (2)Ocean Frontier Institute, Dalhousie University, Halifax, NS, Canada
N2 fixation in coastal waters of China: from subtropical to temperate (319357)
Run Zhang, Danyang Li and Shengbao Chen, Xiamen University, Xiamen, China
Abundance and activity of the N2 fixing unicellular Cyanobacterial symbiont UCYN-A at a Southern California coastal site: light and nutrient controls (323341)
Matthew M Mills1, Kendra A Turk-Kubo2, Samuel T Wilson3, Kevin R Arrigo1 and Jonathan P Zehr4, (1)Stanford University, Earth System Science, Stanford, United States, (2)University of California Santa Cruz, Ocean Sciences, Santa Cruz, United States, (3)Daniel K. Inouye Center for Microbial Oceanography: Research and Education, University of Hawaii at Manoa, Honolulu, United States, (4)UC Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States

See more of: Biogeochemistry and Nutrients