HR: 13:30h
AN: B43B-01 INVITED     [Abstracts]
TI: Floods, Food Webs, and Fluxes in a Northern California channel network
AU: * Power, M E
EM: mepower@socrates.berkeley.edu
AF: Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720 United States
AU: Dietrich, W E
EM: bill@eps.berkeley.edu
AF: Earth and Planetary Science, University of California, Berkeley, Berkeley, CA 94720 United States
AU: Hondzo, M
EM: mhondzo@UMN.EDU
AF: St. Anthony Falls Laboratory, Mississippi River at 3rd Ave. SE, Minneapolis, MN 55414 United States
AU: Finlay, J C
EM: jfinlay@UMN.EDU
AF: Department of Ecology, Evolution and Behavior, University of Minnesota 1987 Upper Buford Circle, St. Paul, MN 55108 United States
AU: McNeely, C
EM: mcneely@socrates.Berkeley.EDU
AF: Department of Ecology, Evolution and Behavior, University of Minnesota 1987 Upper Buford Circle, St. Paul, MN 55108 United States
AU: Schade, J
EM: jschade@berkeley.edu
AF: Department of Ecology, Evolution and Behavior, University of Minnesota 1987 Upper Buford Circle, St. Paul, MN 55108 United States
AU: Welter, J
EM: jwelter@berkeley.edu
AF: Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720 United States
AU: Limm, M
EM: mlimm@socrates.berkeley.edu
AF: Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720 United States
AU: Bode, C
EM: collin@berkeley.edu
AF: Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720 United States
AB: Following flood scour, re-assembling river food webs respond to solute and particle fluxes. During periods of relatively low flow and high biomass, food webs will also intercept and alter these fluxes. We are studying these interactions in the South Fork Eel River and its tributaries in northern California, a steep drainage system subject to a Mediterranean climate regime. During the biologically productive summer low flow season, large algal blooms in sunlit channels tend to follow bed scouring winter floods. These blooms have strong impacts on consumers and predators in local food webs, and on local fluxes, including cross-habitat food web exchange mediated by insect emergence. We are just beginning to study the effects of blooms on fluxes through channels over larger spatial and temporal scales. Year-to-year variation in the magnitude of algal blooms will produce corresponding variation in pulsed releases of organic matter, stored temporarily in the beds of deep pools, and ultimately, in this incised system, in off shore ocean sediments. A small but ecologically significant component, however, may be stored as biomass in long lived vertebrate predators, including bats and salmonids. The ultimate goal of quantifying relationships among flow regimes, ecosystem productivity, food web responses, and fluxes through watersheds will require prolonged cross-disciplinary collaborations, but may become increasingly feasible due to access to new sensor, tracing and mapping technologies.
UR: http://www.nced.umn.edu/
DE: 0400 Biogeosciences
DE: 1821 Floods
DE: 1824 Geomorphology (1625)
DE: 1860 Runoff and streamflow
DE: 4804 Benthic processes/benthos
SC: Biogeosciences [B]
MN: 2005 Joint Assembly