OOS 18 - Generalities and Contingencies with Multiple Global Change Drivers: Diminishing Effects or Amplified Consequences?

Wednesday, August 10, 2016: 8:00 AM-11:30 AM
Grand Floridian Blrm F, Ft Lauderdale Convention Center
Sally E. Koerner, Duke University
Kimberly J. La Pierre, UC Berkeley; and Meghan L. Avolio, National Socio-Environmental Synthesis Center
Sally E. Koerner, Duke University
Global change is pervasive throughout almost every ecosystem on the planet. Nitrogen loads have tripled since the beginning of industrialization. Atmospheric CO2 concentrations have risen dramatically over the past decades. Climate is changing with predicted increases in mean annual temperatures, alterations in precipitation patterns, and more frequent weather extremes. Disturbance regimes are being altered, with some disturbances increasing in frequency like hurricanes, and others decreasing or being eliminated from the landscape like fire. We know that each of these global change drivers can independently have multiple effects on community composition and the functioning of ecosystems, as responses to global change drivers when acting in isolation, or occasionally with one interacting variable, have been intensively studied. Yet, these global change factors are not acting on ecosystems in isolation. Instead, multiple global change drivers are simultaneously affecting most ecosystems and it remains unknown how these effects combine in the real world. There is some evidence that ecosystem responses to simultaneous alteration of multiple global change drivers are not simply additive. Rather these multiple drivers may be antagonistic, creating a dampening effect, or mutually synergistic, amplifying the effect. These possibilities suggest that the single factor studies that are the norm in ecology are not always sufficient to predict impacts of co-occurring global change drivers. This organized oral session will address the impact of multiple global change drivers on community dynamics and ecosystem function, presenting a combination of terrestrial and aquatic case studies as well as meta-analysis synthetic studies. The overarching goal of our session is explore how multiple global change drivers interact to affect multiple levels of biological organization bringing together speakers studying the effects of global changes drivers from multiple perspectives. This session will begin with presentations on ecosystem function response followed by presentations on responses of community composition, and finally presentations on trophic interactions. Each of these three topics will have a presentation on a meta-analysis as well as case study like presentations on different ecosystems. Overall, this organized oral session will synthesize studies examining multiple global change drivers with the aim of presenting what is currently known as well as foster discussion of how best to study the effects of global change drivers.
8:00 AM
 Plant traits and sea level rise dominate tidal marsh response to global change
J. Patrick Megonigal, Smithsonian Environmental Research Center; Meng Lu, Smithsonian Environmental Research Center; J. Adam Langley, Smithsonian Environmental Research Center; Thomas J. Mozdzer, Smithsonian Environmental Research Center; Blanca Bernal, Smithsonian Environmental Research Center
8:20 AM
 Consequences of eutrophication on drought resistance of grasslands: A multi-site exploration of resource co-limitation
Siddharth B. Iyengar, University of Minnesota; Elizabeth T. Borer, University of Minnesota; Eric W. Seabloom, University of Minnesota
9:20 AM
 Plant community responses to multiple global change drivers: A synthesis examining the magnitude and variance of responses
Kimberly J. La Pierre, UC Berkeley; Meghan L. Avolio, National Socio-Environmental Synthesis Center; Forest Isbell, University of Minnesota; Nathan P. Lemoine, Colorado State University; Emily Grman, Eastern Michigan University; Gregory R. Houseman, Wichita State University; David S Johnson, VIMS; Sally E. Koerner, Duke University; Kevin R. Wilcox, University of Oklahoma; Corre Data Consortium, Multiple Institutions
9:40 AM
9:50 AM Cancelled
 Chronic eutrophication does not change plant community resistance and resilience to drought
Meghan L. Avolio, National Socio-Environmental Synthesis Center; Sally E. Koerner, Duke University
10:30 AM
 Legacies from extreme drought increase ecosystem sensitivity to future climate extremes
Melinda D. Smith, Colorado State University; Alan K. Knapp, Colorado State University; David L. Hoover, U.S. Geological Survey; Meghan L. Avolio, National Socio-Environmental Synthesis Center; Andrew Felton, Colorado State University; Kevin R. Wilcox, University of Oklahoma
10:50 AM
 Local adaptation of freshwaters to global-driven environmental changes
Pablo Urrutia Cordero, Lund University; Mattias K. Ekvall, Lund University; Lars-Anders Hansson, Lund university
11:10 AM
 You can add up the parts, but you won’t have the sum: Can many global change experiments tell us more than the individual ones?
Sebastian Leuzinger, Auckland University of Technology; Claus Beier, University of Copenhagen; Christian K├Ârner, University of Basel; Yiqi Luo, University of Oklahoma; Sara Vicca, University of Antwerp; J. Adam Langley, Villanova University; Mark Hovenden, University of Tasmania; Simone Fatichi, ETH Zurich