OB14D:
New Tools and Approaches to Constrain the Marine Nitrogen Cycle: From the Surface to the Sediments III Posters

Session ID#: 85860

Session Description:
Nitrogen (N) exerts an important control on marine productivity affecting ocean deoxygenation and climate relevant gases such as CO2 and N2O. Natural and anthropogenic changes can significantly alter the marine N cycle. Understanding what controls the rates and distribution of key N-cycle processes (including but not limited to atmospheric deposition, riverine discharge, N2 fixation, N-loss, nitrification, organic production and recycling) and their interaction with other biogeochemical cycles (e.g. C, P, Fe, O2) is therefore of fundamental importance for predicting the response and resilience of marine biogeochemistry to ongoing climate change and pollution. We invite contributions that use various techniques (such as isotopes, molecular, biomarkers, modelling) to study N-cycle processes, covering diverse spatial and temporal scales. This session strives to bring together observationalists, experimentalists, and modellers to promote an integrated understanding of the N-cycle and its sensitivity to environmental change.
Co-Sponsor(s):
  • IS - Ocean Observatories, Instrumentation and Sensing Technologies
  • MM - Microbiology and Molecular Ecology
  • PI - Physical-Biological Interactions
Index Terms:
Primary Chair:  Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Co-chairs:  Mar Benavides, Mediterranean Institute of Oceanography, Marseille Cedex 09, France, Angela Landolfi, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany and Carolin R. Löscher, Univ Southern Denmark, Odense, Denmark
Primary Liaison:  Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Moderators:  Mar Benavides, Mediterranean Institute of Oceanography, Marseille Cedex 09, France and Carolin R. Löscher, Univ Southern Denmark, Odense, Denmark
Student Paper Review Liaison:  Mar Benavides, Mediterranean Institute of Oceanography, Marseille Cedex 09, France

Abstracts Submitted to this Session:

 
Cell-specific Nitrogen Fixation Rates of the Symbiotic Cyanobacterium UCYN-A Vary with Depth and Photoperiod (654448)
Mary Rose Gradoville1, Ana Maria Cabello Perez1, Samuel T Wilson2, Kendra A Turk-Kubo1, David M Karl2 and Jonathan P Zehr1, (1)University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, (2)University of Hawaii at Manoa, Department of Oceanography, Honolulu, HI, United States
 
Dominance of heterotrophic N2 fixation in a temperate estuary (643384)
Mar Benavides1, Søren Hallstrøm2, Clayton Woodward Evans3, Lindsey Janel Potts4, Julie Granger4, Craig R Tobias4, Colleen B Mouw5, Lasse Riemann6 and Pia Moisander7, (1)Mediterranean Institute of Oceanography, Marseille Cedex 09, France, (2)Copenhaguen University, Denmark, (3)Texas State University San Marcos, San Marcos, TX, United States, (4)University of Connecticut, Department of Marine Sciences, Groton, CT, United States, (5)University of Rhode Island, Narragansett, RI, United States, (6)University of Copenhagen, Marine Biological Section, Helsingor, DE, Denmark, (7)University of Massachusetts Dartmouth, Department of Biology, North Dartmouth, MA, United States
 
Counteracting impacts of increasing atmospheric nitrogen and iron deposition on global marine N2 fixation in the Anthropocene (646168)
Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany and Angela Landolfi, GEOMAR Helmholtz Centre for Ocean Research Kiel, Marine Biogeochemical Modeling, Kiel, Germany
 
Effects of Mesoscale Eddies on the Contribution of N2 Fixation to Export Production in the North Pacific Subtropical Gyre (652025)
Mengyang Zhou, University of Connecticut, Groton, CT, United States, Julie Granger, University of Connecticut, Department of Marine Sciences, Groton, CT, United States, Angelicque E White, University of Hawaii at Manoa, Department of Oceanography, Honolulu, HI, United States, Benedetto Barone, University of Hawaii at Manoa, Honolulu, HI, United States and David M Karl, University of Hawaii, Department of Oceanography, Honolulu, HI, United States
 
Hydrogen production by diazotrophs: a novel approach for high frequency measurements of nitrogen fixation (644197)
Mathieu Caffin1, Samuel T Wilson2, Angelicque E White3 and David M Karl2, (1)University of Hawaii at Manoa, Department of Oceanography, Honolulu, United States, (2)Daniel K. Inouye Center for Microbial Oceanography: Research and Education, University of Hawaii at Manoa, Honolulu, HI, United States, (3)University of Hawaii, Department of Oceanography, Honolulu, HI, United States
 
Temporal Dynamics of the Diazotroph UCYN-A and its Known and Possible Hosts over 10 Years at the San Pedro Ocean Time-series (SPOT) (646728)
Colette Fletcher-Hoppe, Yi-Chun Yeh and Jed A Fuhrman, University of Southern California, Los Angeles, CA, United States
 
Unexpected Presence of the Nitrogen-fixing Symbiotic Cyanobacterium UCYN-A in Coastal Monterey Bay Waters (655148)
Ana Maria Cabello Perez1, Kendra A Turk-Kubo1, Kendra Negrey1, Lucien Jacobs1, Raphael Martin Kudela2 and Jonathan P Zehr1, (1)University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, (2)University of California Santa Cruz, Santa Cruz, United States
 
Airborne microbes contribute to N2 fixation in surface water of the Northern Red Sea (490630)
Eyal Rahav1, Adina Paytan2, Esra Mescioglu3, Yuri Galletti4, Sahar Rosenfeld5, Ofrat Raveh5, Chiara Santinelli6, Tung-Yuan Hou7 and Barak Herut5, (1)Israel Oceanographic and Limnological Research, National Institute of Oceanography, Haifa, Israel, (2)University of California Santa Cruz, Institute of Marine Sciences, Santa Cruz, United States, (3)University of California Santa Cruz, Santa Cruz, CA, United States, (4)Institute of Biophysics, C.N.R, Area della Ricerca di Pisa, Italy, (5)Israel Oceanographic and Limnological Research, Haifa, Israel, (6)CNR Institute of Biophysics, Pisa, Italy, (7)IONTU Institute of Oceanography National Taiwan University, Taipei, Taiwan
 
Detection of the Nitrogen Fixing Bacteria UCYN-A using nifH geneFISH (656809)
Katie Jean Harding1,2, Kendra A Turk-Kubo1, Xavier Mayali2 and Jonathan P Zehr1, (1)University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, (2)Lawrence Livermore National Laboratory, Livermore, CA, United States
 
Effects Of Southern Hemispheric Wind Changes On Marine Biological Production And N2 Fixation (647795)
Angela Landolfi1, Julia Getzlaff2 and Christopher J Somes1, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)GEOMAR, Helmholtz Centre for Ocean Research, Kiel, Germany
 
Modelling the Impact of Multiple Environmental Drivers on Marine Diazotrophy (641324)
Lewis Wrightson, University of Liverpool, Liverpool, L69, United Kingdom, Claire Mahaffey, University of Liverpool, Earth, Ocean and Ecological Sciences, Liverpool, United Kingdom, Olivier Aumont, IPSL, Laboratoire d’Oceanographie et de Climatologie: Experimentation et Approches Numeriques, Paris, France and Alessandro Tagliabue, University of Liverpool, Liverpool, United Kingdom
 
Three Years of Observations Show a Sharp Boundary for Diazotrophs and N2 Fixation Rates near the Northern Subtropical Front of the North Pacific Ocean (654216)
Wingkwan Mak1, Mary Rose Gradoville1, Hanna Farnelid2, Angelicque E White3, Kendra A Turk-Kubo1, Brittany Stewart4, Francois Ribalet5, Sara Ferrón6, Paulina Pinedo-Gonzalez7, Virginia Armbrust5, David M Karl6, Prof Seth John8 and Jonathan P Zehr1, (1)University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, (2)Linnaeus University, Sweden, (3)University of Hawaii at Manoa, Department of Oceanography, Honolulu, HI, United States, (4)University of Southern California, Los Angeles, United States, (5)University of Washington, School of Oceanography, Seattle, WA, United States, (6)University of Hawaii, Department of Oceanography, Honolulu, HI, United States, (7)Lamont -Doherty Earth Observatory, Geochemistry, Palisades, NY, United States, (8)University of Southern California, Department of Earth Sciences, Los Angeles, CA, United States
 
Variable Nitrogen Fixation in Crocosphaera watsonii Experiencing Iron-Light Co-limitation (654551)
Johann Lopez, Nathan S Garcia and Katherine R Mackey, University of California Irvine, Earth System Science, Irvine, CA, United States