MSA - Ecology/Pathology
Andrew, Carrie J , Lilleskov, Erik A .
Itís a matter of time and location: above- and below-ground responses by ectomycorrhizal fungi to elevated CO2 and O3 across four years.
Atmospheric carbon dioxide (CO2) and tropospheric ozone (O3) continue to increase since industrialization. Changes in the concentrations of these two gases can cascade through ecosystem trophic levels, affecting the growth and reproduction of heterotrophic organisms. Since ectomycorrhizal fungi require carbon from their host(s), they can be especially sensitive to changes in primary production due to altered CO2 and O3 concentrations. Here we compare the production and community responses by ectomycorrhizal fungi to elevated CO2 and O3 at two time points: 2003 and 2006. Since ectomycorrhizal taxa can allocate different amounts of their carbon into mycorrhizas, mycelium and sporocarps, we provide ectomycorrhizal fungal response above- and below-ground for both sampling years. During 2003, elevated CO2 and O3 affected the productivity of ectomycorrhizal sporocarps as well as the community composition. Regardless of these aboveground effects, CO2 and O3 concentrations did not affect the belowground ectomycorrhiza communities, partly due to greater taxa diversity belowground than aboveground. During 2006, elevated CO2 and O3 continued to affect sporocarp productivity while the effects of CO2 and O3 on community composition abated. The belowground communities were even more diverse than they were in 2003. We captured a dynamic time period for the responses of ectomycorrhizal fungal communities to elevated CO2 and O3.
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1 - Michigan Technological University, School of Forest Resources and Environmental Science, 1400 Townsend Dr., Houghton, MI, 49931, USA
2 - USDA Forest Service, Northern Research Station, Forestry Sciences Laboratory, 410 MacInnes Dr. , Houghton, MI, 49931, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Cottonwood B/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 2:15 PM