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Session Proposal: From Molecules to Food Webs: Nitrogen Cycling Processes in Aquatic Environments (AGU25)

B047
From Molecules to Food Webs: Nitrogen Cycling Processes in Aquatic Environments

Session ID#: 252380

Session Description:
Nitrogen (N) cycling in aquatic ecosystems—both marine and freshwater—is fundamental to ecosystem productivity, biogeochemical fluxes, and food web structure. At the base of these systems, primary producers assimilate inorganic N through both autotrophic and mixotrophic pathways, converting it organic N, predominantly in the form of proteins and amino acids (AAs), which serve as the primary carriers of N as it moves through the food webs. Chemoautotrophic microorganisms also contribute significantly by driving redox transformations of N, connecting the N cycle to carbon, oxygen, and greenhouse gas dynamics.This session invites research that advances our understanding of the sources, transformations, and ecological consequences of N cycling in aquatic environments. We welcome studies using a range of tools—from stable isotope analysis to molecular biology and numerical modeling—to trace N pathways, reconstruct past biogeochemical conditions, or assess contemporary ecosystem responses to anthropogenic and climatic perturbations.
Co-Sponsor(s):
  • EP - Earth and Planetary Surface Processes
  • GC - Global Environmental Change
  • OS - Ocean Sciences
  • PP - Paleoceanography and Paleoclimatology
Index Terms:

0454 Isotopic composition and chemistry [BIOGEOSCIENCES]
0469 Nitrogen cycling [BIOGEOSCIENCES]
1041 Stable isotope geochemistry [GEOCHEMISTRY]
1050 Marine geochemistry [GEOCHEMISTRY]
Primary Convener:  Lin Zhang, Texas A&M University Corpus Christi, Corpus Christi, United States
Conveners:  Wei Qin, University of Illinois at Urbana-Champaign, Department of Microbiology, Urbana-Champaign, United States, Weiyi Tang, University of South Florida St. Petersburg, St Petersburg, United States and Dr. Xin Sun, University of Pennsylvania, Department of Biology, Philadelphia, United States
Student/Early Career Convener:  Charlotte Lee, Woods Hole Oceanographic Institution, Woods Hole, United States
 
Microbial Interactions Matter for Biogeochemistry: Nitrite Consumers Induce Nitrite Accumulation (1855844)
Dr. Xin Sun1, Daniel McCoy2, Liang Xu2, Pearse Buchanan3 and Emily Zakem2, (1)University of Pennsylvania, Department of Biology, Philadelphia, United States, (2)Carnegie Institution for Science Stanford, Stanford, United States, (3)Commonwealth Scientific and Industrial Research Organisation, TAS, Australia
 
Nitrogen availability and control of primary production, nutrient removal efficiency and outwelling in a river-dominated estuary, Mobile Bay, Alabama (1858830)
John C Lehrter1,2, Dr. Zhilong Liu1, Allison Fletcher1, Nick LaBon2, Alyssa Bourne1, Chris Mikolaitis1, Jonae Cameron3, Olivia Pickett1, Ethan Zibas1, Brian Dzwonkowski1,2 and Harikrishnan Sreeshylam1, (1)University of South Alabama, Stokes School of Marine and Environmental Sciences, Mobile, United States, (2)Dauphin Island Sea Lab, Dauphin Island, United States, (3)University of South Alabama, Mobile, United States
 
Coupled oceanic nitrogen losses and inputs over the past six million years (Invited) (1863270)
Dr. Xingchen Tony Wang, PhD1, Tianshu Kong2, Haojia Abby Ren3, Ying Cui4, Alexandra Auderset5, Dario Marconi6, Ruixiang Zhai2, Jesse R Farmer7, Jessica Lueders-Dumont8, Christopher J Somes9, Andreas Oschlies9, Benjamin Petrick10, Ana Christina Ravelo11, Alfredo Martinez-Garcia12, Gerald Haugh13, Daniel Mikhail Sigman14 and Yige Zhang15, (1)Boston College, Department of Earth and Environmental Sciences, Chestnut Hill, MA, United States, (2)Boston College, Department of Earth and Environmental Sciences, Chestnut Hill, United States, (3)National Taiwan University, Research Center for Future Earth, Taipei, Taiwan, (4)Montclair State University, Department of Earth and Environmental Studies, Montclair, NJ, United States, (5)University of Southampton, School of Ocean and Earth Science, Southampton, United Kingdom, (6)Princeton University, Princeton, NJ, United States, (7)University of Massachusetts Boston, Boston, MA, United States, (8)Boston College, Chestnut Hill, MA, United States, (9)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (10)University College London, London, United Kingdom, (11)University of California-Santa Cruz, Santa Cruz, CA, United States, (12)Max Planck Institute for Chemistry, Mainz, Germany, (13)Max Planck Institute for Chemistry, Climate Geochemistry Department, Mainz, Germany, (14)Princeton University, Geosciences, Princeton, United States, (15)State Key Laboratory of Deep Earth Processes and Resources (DEEPER), Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
 
An analytical framework for intramolecular δ15N analysis of poly-nitrogenous amino acids (1887838)
Charlotte Wing Man Lee1, Mark A Altabet2, Jesus Baca1, Jason Barrera1, Nayeli Delgado3, Lauren Gilley3, Ella Moats1,4, Jamie Guest1, Cambree Jones1, Love Rios1 and Lin Zhang1, (1)Texas A&M University Corpus Christi, Corpus Christi, United States, (2)Univ Massachusetts Darmouth, New Bedford, United States, (3)Texas A&M University Corpus Christi, Corpus Christi, TX, United States, (4)West Virginia University, Morgantown, United States
 
Amino Acid Concentrations and Nitrogen Isotopes Patterns In Phytoplankton Across Growth Phases (1896606)
Nayeli Delgado1, Jesus Baca2, Nayani Vidyarathna3, KhDola Wahid4, Patricia M Glibert3, Mark A Altabet4, Charlotte Lee2,5 and Lin Zhang2, (1)Texas A&M University Corpus Christi, Corpus Christi, TX, United States, (2)Texas A&M University Corpus Christi, Corpus Christi, United States, (3)University of Maryland Center for Environmental Science Horn Point Laboratory, Cambridge, United States, (4)University of Massachusetts Dartmouth, New Bedford, United States, (5)Woods Hole Oceanographic Institution, Woods Hole, United States
 
Natural Intelligence of the Nitrogen Cycle: Fine-Tuning by Multiple Nitrogen Cycling Processes to Optimize Opportunities in Ocean Dead Zones (Invited) (1901328)
J Michael Beman, University of California Merced, Merced, CA, United States and Frank Gutierrez, University of California Merced, Merced, United States
 
δ15N-AA of Eye Lens Layers in Roundnose Grenadier from Two Norwegian Fjords with Contrasting Hypoxia Conditions (1901372)
Cresencia Barrera1, Ames Finley1, Jason Barrera1, Charlotte Lee2, Jesus Baca1, Mark A Altabet3 and Lin Zhang1, (1)Texas A&M University Corpus Christi, Corpus Christi, United States, (2)Woods Hole Oceanographic Institution, Woods Hole, United States, (3)Univ Massachusetts Darmouth, New Bedford, United States
 
Metabolic capabilities of nitrogen cycling organisms (1917116)
Subhadeep Chowdhury, Boston University, Earth and Environment, Boston, United States, Daniel Segre, Boston University, Bioinformatics Program, Faculty of Computing and Data Science, Boston, United States and Robinson W Fulweiler, Boston University, Earth and Environment, Biology, Boston, MA, United States
 
mSIDGO v1: A global open access marine metazoan stable isotope database (1936214)
Jessica Lueders-Dumont1, Kathryn O’Brien2, Ruth Steinshouer3, Lillian Corbitt3, Aaron O'Dea4, Seth Finnegan5, Daniel Mikhail Sigman6, Bess B Ward7 and Tony Xingchen Wang8, (1)Boston College, Chestnut Hill, MA, United States, (2)Boston College, Earth and Environmental Studies, Chestnut Hill, United States, (3)Boston College, Chestnut Hill, United States, (4)Smithsonian Tropical Research Institute, Balboa, Panama, (5)University of California Berkeley, Integrative Biology, Berkeley, United States, (6)Princeton University, Geosciences, Princeton, United States, (7)Princeton University, Department of Geosciences, Princeton, NJ, United States, (8)Boston College, Boston, United States
 
On the coupling between N2 fixation and particulate organic matter stoichiometry in the global ocean (1950899)
Christopher J Somes1, Na Li1, Angela Landolfi2, Markus Pahlow1 and Andreas Oschlies1, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)Institute for Marine Sciences (ISMAR) CNR Roma, Roma, Italy
 
Unraveling Marine Nitrogen Cycling in the Western North Pacific and South China Sea: Insights from Dual Nitrate Isotopes and Isotope-Based Modeling (1954763)
Ren-Yi Cai-Li, Haojia Abby Ren and Yu-Chen Liu, National Taiwan University, Department of Geosciences, Taipei, Taiwan
 
Finding the Roots of the Nitrogen Cycle in Marine Sediment Using DET Samplers and qPCR (1968109)
Jessica Scotten, Western Washington University, Bellingham, WA, United States and David Shull, Western Washington University, Bellingham, United States
 
Trophic Position and Basal Nitrogen Sources of Zooplankton Across Oceanographic Gradients (1971644)
Lauren Gilley1, Charlotte Lee2,3, Jason Barrera3, Mark A Altabet4 and Lin Zhang3, (1)Texas A&M University Corpus Christi, Corpus Christi, TX, United States, (2)Woods Hole Oceanographic Institution, Woods Hole, United States, (3)Texas A&M University Corpus Christi, Corpus Christi, United States, (4)Univ Massachusetts Darmouth, New Bedford, United States
 
Evaluating foraminifera-bound δ15N as an ocean deoxygenation proxy: The influence of oxygen-deficient zone depths (1972826)
Tianshu Kong1, Thomas C Lee1, Kameko Landry1, Ruixiang Zhai1, Sijia Dong2 and Dr. Xingchen Tony Wang, PhD3, (1)Boston College, Department of Earth and Environmental Sciences, Chestnut Hill, United States, (2)Nanjing University, School of Sustainable Energy and Resources, Suzhou, China, (3)Boston College, Department of Earth and Environmental Sciences, Chestnut Hill, MA, United States
 
Environmental Controls and Ecological Niches of Dominant Marine Ammonia-oxidizing Archaea Ecotypes in the Northeastern Pacific (1990429)
LEI Hou1, Dr. Xin Sun2, Hanyan Li3, Zhiguo Zhang1, David Stahl4 and Wei Qin1, (1)University of Illinois at Urbana-Champaign, Department of Microbiology, Urbana-Champaign, United States, (2)University of Pennsylvania, Department of Biology, Philadelphia, United States, (3)University of Oklahoma, Norman, United States, (4)University of Washington, Seattle, United States
 
Ocean warming enhances iron use efficiency in marine ammonia-oxidizing archaea and reshapes large-scale nitrogen cycling (1990476)
Wei Qin1, Alessandro Tagliabue2, Seth John3, Feixue Fu4 and David A Hutchins4, (1)University of Illinois at Urbana-Champaign, Department of Microbiology, Urbana-Champaign, United States, (2)University of Liverpool, Department of Earth, Ocean and Ecological Sciences, Liverpool, L69, United Kingdom, (3)University of Southern California, Department of Earth Sciences, Los Angeles, United States, (4)University of Southern California, Department of Biological Sciences, Los Angeles, United States
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