OOS 40 - Nitrogen Deposition Alters Terrestrial Biodiversity: Patterns, Causes and Potential Consequences

Thursday, August 11, 2011: 1:30 PM-5:00 PM
17A, Austin Convention Center
Organizer: William D. Bowman
Moderator: William D. Bowman
Emissions of atmospheric reactive nitrogen (N) have increased globally due to agricultural and industrial activities, resulting in substantial increases in deposition rates relative to pre-industrial levels. The observed ecological consequences of anthropogenic N deposition include ecosystem eutrophication and acidification, and losses of biodiversity. This session will explore the patterns of biodiversity changes in terrestrial ecosystems due to N deposition and the potential consequences for those changes. We will first review the observed changes and causes of biodiversity change, focusing primarily on plant and microbial responses. We will then examine the potential consequences of these losses in terms of plant-mycorrhizal interactions, plant-consumer interactions, invasibility of communities and susceptibility to altered disturbance regimes, and transmission of disease.
1:50 PM
Responses of soil microbes to N deposition: Implications for ecosystem function
Diana Nemergut, University of Colorado; John Jennett, University of Colorado; Laurent Philippot, INRA-Université de Bourgogne; Kate Schimel, University of Colorado; Timothy R. Seastedt, University of Colorado at Boulder; Philip G. Taylor, Duke University; Alan R. Townsend, University of Colorado at Boulder; Chris Washenberger, University of Colorado; William R. Wieder, University of Colorado, Boulder; Donald R. Zak, University of Michigan
2:30 PM
Winners and losers in response to nitrogen deposition: The roles of resource competition, abundance, and microbial interactions in diversity decline
Katharine N. Suding, University of California at Berkeley; Emily C. Farrer, UC Berkeley; Sarah Hicks, University of New Mexico; Andrea Porras-Alfaro, Western Illinois University; Marko J. Spasojevic, Washington University in St. Louis
2:50 PM
Is nitrogen deposition manna for herbivores?
Heather L. Throop, New Mexico State University; Manuel Lerdau, University of Virginia
3:10 PM
3:20 PM
Linking N deposition to invasive plant biomass, fires, and diversity loss in the California deserts
Edith B. Allen, University of California, Riverside; Leela E. Rao, University of California, Riverside; Robert J. Steers, University of California, Riverside
3:40 PM
Understanding the link between changing nutrient cycles and the risk of infectious disease
Pieter T.J. Johnson, University of Colorado; Alan R. Townsend, University of Colorado at Boulder
4:00 PM
Elevated atmospheric N deposition alters composition of forest floor fungal communities
Elizabeth M. Entwistle, University of Michigan; Donald R. Zak, University of Michigan
4:20 PM
Nitrogen deposition and early growth of native and exotic grasses of the California oak savanna
Elise M. Tulloss, University of California, Davis; Mary L. Cadenasso, University of California, Davis
4:40 PM
Chronic atmospheric N deposition decreases microarthropod density in a northern hardwood ecosystem
Huijie Gan, University of Michigan; Mark D. Hunter, University of Michigan; Donald R. Zak, University of Michigan
See more of: Organized Oral Session
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