BN31B:
New Insights into Marine N2 Fixation: From Single Cells to Ecosystems I
BN31B:
New Insights into Marine N2 Fixation: From Single Cells to Ecosystems I
New Insights into Marine N2 Fixation: From Single Cells to Ecosystems I
Session ID#: 37141
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, Florida State University, Earth, Ocean and Atmospheric Science, Tallahassee, FL, United States and Angela N Knapp, Florida State University, Tallahassee, FL, United States
Moderators: Sven Alexander Kranz, Florida State University, Earth, Ocean and Atmospheric Science, Tallahassee, FL, United States and Angela N Knapp, Florida State University, Tallahassee, FL, United States
Student Paper Review Liaison: Sven Alexander Kranz, Florida State University, Earth, Ocean and Atmospheric Science, Tallahassee, FL, 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:
- MM - Microbiology and Molecular Ecology
- OM - Ocean Modeling
- PC - Past, Present and Future Climate
Abstracts Submitted to this Session:
Distribution of the Nitrogen Fixing, Cyanobacterial Symbiont UCYN-A in the Chukchi and Beaufort Seas (319983)
See more of: Biogeochemistry and Nutrients