HR: 10:20h
AN: H42A-01 INVITED    [Abstracts]
TI: Detecting change in ecological controls down drainage networks
AU: * Power, M
EM: mepower@berkeley.edu
AF: Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, United States
AU: Finlay, J
EM:
AF: Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN 55108, United States
AU: Goodrich, M
EM: goodrich@berkeley.edu
AF: Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, United States
AU: McNeely, C
EM: fmcnceely@mail.ewu.edu
AF: Biology Department, Eastern Washington University, Cheney, WA 99004,
AU: Limm, M
EM: mlimm@berkeley.edu
AF: Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, United States
AU: Hondzo, M
EM:
AF: St Anthony Falls Hydraulics Laboratory, University of Minnesota, Minneapolis, MN 55414, United States
AU: Foufoula-Georgiou, E
EM: efi@tc.umn.edu
AF: St Anthony Falls Hydraulics Laboratory, University of Minnesota, Minneapolis, MN 55414, United States
AU: Dietrich, W
EM: bill@eps.berkeley.edu
AF: Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA 94720, United States
AB: Ecosystem and food web controls of populations, trophic level biomass, and biogeochemical fluxes change down drainage networks. Field surveys, stable isotope tracers, and mensurative experiments repeated at different sites down along the upper drainages South Fork Eel River (North Coast of California) suggest that there are thresholds in drainage area where controls change on nitrogen loading from biological fixation, carbon sources to different consumer guilds in channel food webs, insect emergence, and bat tracking of this emergence. Between these thresholds, scaling relationships with channel hydraulic geometry may provide useful estimates of biomass distribution patterns of certain organisms that are relatively unaffected by consumer control, like some cyanobacteria. By investigating why controls and scaling relationships change at certain landscape positions under present environmental conditions, we hope to improve our ability to forecast how these transitions may shift with climate, land use, or biotic change, expanding, shrinking, or re-locating landscape domains under particular types of control. These steps seem necessary, but far from sufficient, for the grand challenge of linking local ecological control mechanisms to larger, basin-wide response.
DE: 0408 Benthic processes (4804)
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0439 Ecosystems, structure and dynamics (4815)
DE: 0483 Riparian systems (0744, 1856)
DE: 0491 Food webs and trophodynamics (4817)
SC: Hydrology [H]
MN: 2007 Fall Meeting