OOS 34
From Bacteria to the Biosphere: Nitrogen Isotope Applications Across Systems and Scales
Thursday, August 14, 2014: 8:00 AM-11:30 AM
203, Sacramento Convention Center
Organizer:
Alison R. Marklein, University of California - Davis
Co-organizer:
Benjamin Z. Houlton, University of California, Davis
Moderator:
Alison R. Marklein, University of California - Davis
The ratio of heavy to light nitrogen isotopes can be used to examine the N cycle, across scale ranging from bacteria to the global ecological system. The fact that the 15N:14N ratio changes based on rates of biological activity can be used to infer biological processes that are otherwise difficult to measure.
We propose a session to address the past, present and future applications of nitrogen isotopes in ecological research. The proposed session will begin with an overview of nitrogen isotopes, will be followed by talks focusing on specific ecosystems, and then focusing on different time periods. Speakers discuss research in terrestrial, oceanic, and land/aquatic interfaces, paleo reconstruction using nitrogen isotopes, and modeling applications.
9:00 AM
Climatic patterns and changes in marine N isotope pools
Curtis A. Deutsch, University of Washington;
Thomas Weber, University of Washington;
Hartmut Frenzel, University of Washington;
William Berelson, University of Southern California;
Tim DeVries, University of California, Los Angeles
9:20 AM
Inferring salmon population dynamics and fishing impacts at multiple scales using sediment nitrogen isotopes
Daniel E. Schindler, University of Washington;
Gordon W. Holtgrieve, University of Washington;
Lauren A. Rogers, University of Oslo;
Peter J. Lisi, University of Washington;
Kale E. Bentley, University of Washington School of Aquatic and Fisheries Science;
Patrick Walsh, US Fish and Wildlife Service;
Mark Lisac, US Fish and Wildlife Service;
Irene Gregory-Eaves, McGill University & University of Montreal;
Daniel Selbie, Fisheries and Oceans Canada;
Guangjie Chen, Key Laboratory of Plateau Lake Ecology and Global Change;
Bruce Finney, Idaho State University;
Lynda Bunting, University of Regina;
Peter R. Leavitt, University of Regina
10:10 AM
In search of a soil-based, compound-specific proxy for plant leaf nitrogen isotope ratios
Sara K. Enders, University of California, Davis;
Benjamin Z. Houlton, University of California, Davis;
Katherine H. Freeman, Penn State University;
Naohiko Ohkouchi, Japan Agency for Marine-Earth Science and Technology;
Yoshito Chikaraishi, Japan Agency for Marine-Earth Science and Technology;
Nanako O. Ogawa, Japan Agency for Marine-Earth Science and Technology;
HIsami Suga, Japan Agency for Marine-Earth Science and Technology
11:10 AM
Ectomycorrhizal fungal impacts on plant nitrogen nutrition: emerging isotopic patterns, latitudinal variation, and possible mechanisms
Jordan R. Mayor, Swedish University of Agricultural Sciences;
Mohammad Bahram, University of Tartu;
Terry W. Henkel, Humboldt State University;
Franz Buegger, Helmholtz Zentrum München, German Research Center for Environmental Health;
Karin Pritsch, Helmholtz Zentrum München, German Research Center for Environmental Health;
Leho Tedersoo, University of Tartu
