OB020
New Tools and Approaches to Constrain the Marine Nitrogen Cycle: From the Surface to the Sediments

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. 
Index Terms:

1615 Biogeochemical cycles, processes, and modeling [GLOBAL CHANGE]
1615 Biogeochemical cycles, processes, and modeling [GLOBAL CHANGE]
4251 Marine pollution [OCEANOGRAPHY: GENERAL]
4840 Microbiology and microbial ecology [OCEANOGRAPHY: BIOLOGICAL]
4840 Microbiology and microbial ecology [OCEANOGRAPHY: BIOLOGICAL]
4845 Nutrients and nutrient cycling [OCEANOGRAPHY: CHEMICAL]
4870 Stable isotopes [OCEANOGRAPHY: CHEMICAL]
4894 Instruments, sensors, and techniques [OCEANOGRAPHY: BIOLOGICAL]

Primary Chair:  Christopher J Somes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Co-chairs:  Mar Benavides, Mediterranean Institute of Oceanography, Marseille, 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
 
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)UCSC-Inst Marine Sciences, Santa Cruz, CA, 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
 
Can we use functional genetics to constrain the fate of nitrate in estuaries? (638358)
Eric Raes1, Kristen Karsh1, Adam J. Kessler2, Bronwyn Holmes1, Jodie van de Kamp1, Levente Bodrossy1 and Andrew Bisset1, (1)CSIRO, Oceans and Atmosphere, Hobart, TAS, Australia, (2)Monash University, Water Studies Centre, Clayton, VIC, Australia
 
Excess Nutrients in a Coral Reef Ecosystem: Dynamics, Sources and Tracer Techniques (638551)
David Whitall, NOAA-NCCOS, Stressor Detection and Impacts Division, Silver Spring, MD, United States, Meagan Curtis, American Samoa Community College, Marine Science, American Samoa and Andrew Mason, NOAA, NCCOS, Silver Spring, United States
 
Shifts in the Nitrogen Loss Microbe，Anammox Bacteria Community Structure and Abundance in Sediments from the Changjiang Estuary and Its Adjacent Area in East China Sea (639588)
Lulu Fu, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong, China and Yu Zhen, Ocean University of China, Qingdao, China
 
Seasonal transition of the dominant nitrogen source for phytoplankton reconstructed by determining the nitrogen isotope composition for nitrate, ammonium, and individual amino acids of sinking particles in the Northwestern Pacific (640577)
Chisato Yoshikawa1, Nanako O Ogawa2, Yoshito Chikaraishi3, Akiko Makabe4, Yohei Matsui4, Yoshikazu Sasai5, Masahide Wakita6, Makio C Honda7, Yoshihisa Mino8, Maki Noguchi Aita9, Tetsuichi Fujiki10, Takuro Nunoura4, Naomi Harada11 and Naohiko Ohkouchi2, (1)JAMSTEC, Tokosuka, Japan, (2)JAMSTEC, Research Institute for Marine Resources Utilization (Biogeochemistry Program), Yokosuka, Japan, (3)Hokkaido University, Institute of Low Temperature Science, Sapporo, Japan, (4)JAMSTEC, Yokosuka, Japan, (5)Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Research Institute for Global Change (RIGC), Yokohama, Japan, (6)JAMSTEC, MIO, Mutsu, Japan, (7)JAMSTEC, Kanagawa, Japan, (8)Nagoya University, Nagoya, Japan, (9)Japan Agency for Marine-Earth Science and Technology, Research Institute for Global Change, Yokohama, Japan, (10)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, (11)Japan Agency for Marine-Earth Science & Technology, Yokosuka, Japan
 
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
 
Paired Nitrogen Isotope of Chlorophyll-a and Bulk Sediment in Characterizing Coastal Nitrogen Cycling- a Comparative Study in Yellow Sea of China and Benguela Upwelling System (641984)
Yu Xin1, Maojun Yan1, Xiaosong Zhong1 and Shuhang Dong2, (1)Ocean University of China, Marine Chemistry, Qingdao, China, (2)Ocean University of China, Qingdao, China
 
Introducing the Argon-Hydrogen Method to Measure Biological Nitrogen Fixation (642248)
Samuel T Wilson1, Mathieu Caffin1, Angelicque E White2 and David M Karl2, (1)Daniel K. Inouye Center for Microbial Oceanography: Research and Education, University of Hawaii at Manoa, Honolulu, HI, United States, (2)University of Hawaii, Department of Oceanography, Honolulu, HI, United States
 
Top-down versus Bottom-up Controls on the Global Marine Nitrogen Fixation (642606)
Hua Wong1, Li-Ce Wong2, Zhen-Hang Li3 and Ya-Wei Luo3, (1)Xiamen University, XiaMen, China, (2)Xiamen University, China, (3)Xiamen University, Xiamen, China
 
Aphotic Nitrogen Fixation in South China Sea (642758)
Siqi Wu1, Qiaoyun Lin2 and Shuh-Ji Kao1, (1)State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China, (2)South China Insitute of Environmental Science, Ministry of Ecology and Environment, Guangzhou, China, Guangzhou, China
 
Phosphate availability as a key factor controlling nitrogen fixation and the BCP in the iron rich Western Tropical South Pacific (643278)
Thierry Moutin, Mediterranean Institute of Oceanography, Marseille, France
 
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, 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
 
Molecular diagnosis of Trichodesmiumnutrient limitation in the oligotrophic North Atlantic (643750)
Elena Cerdan-Garcia1, Despo Polyviou2, Alison J Baylay2, Claire Mahaffey3, Maeve C Lohan2, Malcolm Woodward4, Mark M Moore5, Julie Robidart6 and Thomas S Bibby2, (1)University of Southampton, Southampton, United Kingdom, (2)University of Southampton, Ocean and Earth Sciences, National Oceanography Centre, Southampton, United Kingdom, (3)University of Liverpool, Earth, Ocean and Ecological Sciences, Liverpool, United Kingdom, (4)Plymouth Marine Laboratory, Plymouth, United Kingdom, (5)University of Southampton, Ocean and Earth Science, Southampton, United Kingdom, (6)National Oceanography Centre Southampton, Ocean Technology and Engineering, Southampton, United Kingdom
 
Hydrogen production by diazotrophs: a novel approach for high frequency measurements of nitrogen fixation (644197)
Mathieu Caffin1, Samuel T Wilson1, Angelicque E White2 and David M Karl1, (1)Daniel K. Inouye Center for Microbial Oceanography: Research and Education, University of Hawaii at Manoa, Honolulu, HI, United States, (2)University of Hawaii, Department of Oceanography, Honolulu, HI, United States
 
Effects of water mass mixing on diazotrophy at the New England shelfbreak front (644423)
Corday Selden1, Margaret R Mulholland2, Phoebe D Chappell3, Sophie Clayton3, Alfonso Macias-Tapia4, Peter W Bernhardt5 and Dennis Joseph McGillicuddy Jr6, (1)Old Dominion University, Ocean, Earth and Atmospheric Sciences, Norfolk, United States, (2)Old Dominion University, Ocean, Earth and Atmospheric Sciences, Norfolk, VA, United States, (3)Old Dominion University, Ocean, Earth, and Atmospheric Sciences, Norfolk, VA, United States, (4)Old Dominion University, Norfolk, VA, United States, (5)Old Dominion University, Department of Ocean, Earth and Atmospheric Sciences, Norfolk, VA, United States, (6)Woods Hole Oeanographic Institution, Woods Hole, MA, United States
 
Investigating water-column and sediment N2O cycling in the Western Arctic using stable isotopes and isotopomers. (644723)
Annie Bourbonnais, University of South Carolina, School of the Earth, Ocean and Environment, Columbia, SC, United States, Mark A Altabet, Univ Massachusetts Darmouth, New Bedford, MA, United States and Julie Granger, University of Connecticut, Department of Marine Sciences, Groton, CT, United States
 
Tracing sources and sinks of nitrate and nitrite in the East China Sea using nitrogen and oxygen isotopes (644844)
Su Mei Liu1, Xiaoyan Ning1, Shuhang Dong1, Guodong Song1, Lingyan Wang1, Mark A Altabet2, Zhuoyi Zhu3, Ying Wu3, Jing Ling Ren1, Jing Zhang4 and Daji Huang5, (1)Ocean University of China, Qingdao, China, (2)Univ Massachusetts Darmouth, New Bedford, MA, United States, (3)East China Normal University, Shanghai, China, (4)East China Normal University, China, (5)Second Institute of Oceanography, State Oceanographic Administration of China, Hangzhou, China
 
Salt Marsh Soil Denitrification Rates Stimulated Following Oiling in a Large-scale Marsh Mesocosm Experiment (644873)
Alizia Barnes1, Brian J Roberts2, Charles A Schutte2,3 and Ryann Rossi2, (1)United States, (2)Louisiana Universities Marine Consortium, Chauvin, LA, United States, (3)Rowan University, Glassboro, NJ, United States
 
The link between anthropogenic nutrient enrichment and nitrogen fixation in the coastal Great Barrier Reef (645567)
Dirk Erler1, Hanieh Tohidi Farid2, Tom Glaze2, Natasha Carlson-Perret2 and Janice Lough3, (1)Southern Cross University, Centre for Coastal Biogeochemistry, School of Environment, Science and Engineering, Lismore, NSW, Australia, (2)Southern Cross University, Lismore, NSW, Australia, (3)Australian Inst Marine Science, Townsville, QLD, Australia
 
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
 
Quantifying nitrogen assimilation in the deep ocean: urea is an important nitrogen source for bathypelagic microbial communities (646334)
Nestor Arandia Gorostidi, Alma Elizabeth Parada, Alexandra Renee Bausch and Anne E Dekas, Stanford University, Earth System Sciences, Stanford, CA, 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
 
A new method to analyze δ15N of phenylalanine and glutamic acid to reconstruct spatial and temporal variations in N sources and trophic structures (647759)
Lin Zhang, Texas A&M University Corpus Christi, Corpus Christi, TX, United States, Wingman Lee, Texas A&M University-Corpus Christi, Corpus Christi, United States, Chongxiao Ji, Texas A&M University Corpus Christi, Corpus Christi, United States, Rupsa Roy, University of Massachusetts Dartmouth, New Bedford, MA, United States, Ava Kreider-Mueller, University of Massachusetts Dartmouth, SMAST, New Bedford, MA, United States and Mark A Altabet, Univ Massachusetts Darmouth, New Bedford, MA, 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
 
Predicting how O2 characterizes the niche of marine unicellular diazotroph Crocosphaera (647954)
Keisuke Inomura1, Curtis A. Deutsch2, Samuel T Wilson3, Takako Masuda4, Evelyn Lawrenz4, Bučinská Lenka5, Roman Sobotka5, Julia Gauglitz6, Mak A Saito7, Ondřej Prášil4, Naoto Takahata8, Takuhei Shiozaki9, Yuji Sano10, Ken Furuya and Michael J Follows12, (1)University of Washington Seattle, Seattle, WA, United States, (2)University of Washington Seattle Campus, School of Oceanography, Seattle, WA, United States, (3)Daniel K. Inouye Center for Microbial Oceanography: Research and Education, University of Hawaii at Manoa, Honolulu, HI, United States, (4)Institute of Microbiology, Czech Academy of Sciences, Center Algatech, Třeboň, Czech Republic, (5)Institute of Microbiology, Czech Academy of Sciences, Czech Republic, (6)Woods Hole Oceanographic Institution, Marine Chemistry and Geochemistry, Woods Hole, MA, United States, (7)WHOI, Woods Hole, MA, United States, (8)University of Tokyo, Atmosphere and Ocean Research Institute, Kashiwa, Japan, (9)The University of Tokyo, Tokyo, Japan, (10)University of Tokyo, AORI, Bunkyo-ku, Japan, (11)Massachusetts Institute of Technology, Cambridge, MA, United States
 
Factors Controlling Nitrogen Removal and Retention in Marine Sediments (648148)
Rachel Presley1, Anne E Giblin2, Christopher K Algar3, Sean O'Neill1 and Jeremy Joel Rich1, (1)University of Maine, School of Marine Sciences, Orono, ME, United States, (2)Marine Biological Laboratory, Ecosystems Center, Woods Hole, MA, United States, (3)Dalhousie University, Halifax, NS, Canada
 
Iron requirements and uptake strategies of the globally abundant marine ammonia-oxidising archaeon, Nitrosopumilus maritimus strain SCM1 (648277)
Roxana Shafiee, Joseph T Snow, Qiong Zhang and Rosalind E M Rickaby, University of Oxford, Earth Sciences, Oxford, United Kingdom
 
Nitrous oxide in the hypoxia Changjiang Estuary in summer of 2016 during strong El Niño period (648842)
Hua Lin, Jianfang Chen and Bin Wang, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China
 
Nitrogen cycling and circulation in Baffin Bay investigated with isotopic measurements of N2, N2O, and NO3- (648895)
Cara C Manning1, Annie Bourbonnais2, Julie Granger3, Roberta Claire Hamme4, Laurence Yeung5, David Armando Valerio5, Edward D Young6, Zhiyin Zheng7, Nadine Lehmann8, Jean-Eric Tremblay9 and Philippe Tortell1, (1)University of British Columbia, Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada, (2)University of South Carolina, Columbia, SC, United States, (3)University of Connecticut, Department of Marine Sciences, Groton, CT, United States, (4)University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada, (5)Rice University, Houston, TX, United States, (6)University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States, (7)University of British Columbia, Vancouver, BC, Canada, (8)Dalhousie University, Department of Oceanography, Halifax, NS, Canada, (9)Laval University, Biology, Quebec City, QC, Canada
 
Nitrogen fixation by the UCYN-A/haptophyte symbiosis in coastal waters of the southern California Current System (648952)
Kendra A Turk-Kubo1, Matthew M Mills2, Kevin R Arrigo2, Gert van Dijken2, Britt Anderson Henke1, Brittany Stewart3, Samuel Wilson4 and Jonathan P Zehr5, (1)University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, (2)Stanford University, Earth System Science, Stanford, CA, United States, (3)University of Southern California, Los Angeles, United States, (4)University of California, San Diego, United States, (5)University of California, Ocean Sciences, Santa Cruz, CA, United States
 
Towards a global understanding of the role of urea in the ocean nitrogen cycle (650509)
Peter L Croot, iCRAG (Irish Centre for Research in Applied Geosciences), Earth and Ocean Sciences, School of Natural Sciences and the Ryan Institute, National University of Ireland Galway, Galway, Ireland, Alina Wieczorek, National University of Ireland Galway, Earth and Ocean Sciences, School of Natural Sciences and Ryan Institute, Glaway, Ireland and Maija Iris Heller, Pontificia Universidad Católica de Valparaíso Chile, Escuela de Ciencias del Mar, Valparaiso, Chile
 
Iron and copper requirements of the marine ammonia-oxidising bacterium, Nitrosococcus oceani: an examination of the role of trace metals in the niche differentiation and competition between ammonia-oxidising bacteria and archaea (650615)
Poppy Diver, Roxana Shafiee, Joseph T Snow and Rosalind E M Rickaby, University of Oxford, Earth Sciences, Oxford, United Kingdom
 
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
 
Modeling changes in nitrogen and phosphorus cycling from the Last Glacial Maximum to present (653795)
Taylor Sparks Martin, University of Washington, Seattle, CA, United States and Curtis A. Deutsch, University of Washington Seattle Campus, School of Oceanography, Seattle, WA, United States
 
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, 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
 
Nitrogen Cycling in the Canadian Arctic and Sub-Arctic: Constraints from Dual Nitrate Isotope Data (654290)
Nadine Lehmann1, Carolyn Buchwald1, Samuel H. Davin2, Julie Granger3, Markus Kienast1, Moritz F Lehmann4, Owen Sherwood5 and Jean-Eric Tremblay6, (1)Dalhousie University, Department of Oceanography, Halifax, NS, Canada, (2)Université du Québec à Montréal, GEOTOP - Centre de recherche en géochimie et géodynamique, Montreal, QC, Canada, (3)University of Connecticut, Department of Marine Sciences, Groton, CT, United States, (4)University of Basel, Department of Environmental Sciences, Basel, Switzerland, (5)Dalhousie University, Department of Earth Sciences, Halifax, NS, Canada, (6)Laval University, Biology, Quebec City, QC, Canada
 
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 Karl3 and Jonathan P Zehr1, (1)University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States, (2)University of Hawaii at Manoa, Honolulu, HI, United States, (3)University of Hawaii at Manoa, Department of Oceanography, Honolulu, HI, 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
 
Data-Driven Modeling of the Distribution of Diazotrophs in the Global Ocean (654590)
Weiyi Tang1,2 and Nicolas Cassar2,3, (1)Princeton University, Department of Geosciences, Princeton, NJ, United States, (2)Duke University, Nicholas School of the Environment, Durham, NC, United States, (3)Institut Universitaire Européen de la Mer (IUEM), Laboratoire des Sciences de l'Environnement Marin (LEMAR), Brest, France
 
Identifying active diazotrophs in deep-sea sediment (655087)
Anne E Dekas1, Bennett James Kapili2, Samuel E Barnett3 and Daniel H. Buckley3, (1)Stanford University, Earth System Sciences, Stanford, CA, United States, (2)Stanford University, Department of Earth System Science, Stanford, CA, United States, (3)Cornell University, School of Integrative Plant Science, Ithaca, NY, United States
 
Unexpected Presence of the Nitrogen-fixing Symbiotic Cyanobacterium UCYN-A in Coastal Monterey Bay Waters (655148)
Ana Maria Cabello Perez, Kendra A Turk-Kubo, Kendra Negrey, Lucien Jacobs, Raphael Martin Kudela and Jonathan P Zehr, University of California Santa Cruz, Ocean Sciences, Santa Cruz, CA, United States
 
New insights into intracellular nitrogen allocation in phytoplankton using δ15N distributions of free amino acids and chlorophyll (655591)
Jenan Kharbush, Harvard University, Earth and Planetary Sciences, Cambridge, United States; University of Michigan Ann Arbor, Earth and Environmental Sciences, Ann Arbor, MI, United States and Ann Pearson, Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States
 
Unusual nitrification patterns in a eutrophic coastal basin analyzed by geochemical, isotopic (δ15N) and microbiological data from a highly-resolved in situ time series. (655745)
Sebastian Haas1, Brent M. Robicheau2, Julie LaRoche2, Tim Kalvelage1, Subhadeep Rakshit1 and Douglas Wallace1, (1)Dalhousie University, Department of Oceanography, Halifax, NS, Canada, (2)Dalhousie University, Department of Biology, Halifax, NS, Canada
 
Seasonal dynamics of geochemical gradients along with anammox and denitrification activities in a subterranean estuary located in the York river estuary (656265)
Stephanie Wilson1, Iris C Anderson2, Craig R Tobias3 and Bongkeun Song1, (1)Virginia Institute of Marine Science, Biological Sciences, Gloucester Point, VA, United States, (2)Virginia Institute of Marine Sciences, Gloucester Point, VA, United States, (3)University of Connecticut, Department of Marine Sciences, Groton, CT, United States
 
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
 
The contribution of coral-associated denitrification and N2 fixation to reef N-cycling (657200)
Tom Glaze, Southern Cross University, Lismore, NSW, Australia and Dirk Erler, Southern Cross University, Centre for Coastal Biogeochemistry, School of Environment, Science and Engineering, Lismore, NSW, Australia
 
New Proteomic Windows into the Marine Nitrogen Cycle (657210)
Jacob Waldbauer1, Maureen Coleman2 and Lichun Zhang1, (1)University of Chicago, Geophysical Sciences, Chicago, IL, United States, (2)University of Chicago, Chicago, IL, United States
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