2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | VEGETATION ASSEMBLAGES DRIVE PATTERNS IN DAILY METABOLISM IN A DAMMED, EUTROPHIC RIVER | Virtual Platform
VEGETATION ASSEMBLAGES DRIVE PATTERNS IN DAILY METABOLISM IN A DAMMED, EUTROPHIC RIVER
Unlike in terrestrial biomes, which are defined by their vegetation structure and related productivity regimes, the extent to which vegetation assemblages drives fluxes of river metabolism is unknown. To investigate the effects of vegetation assemblages on river metabolism, we calculated daily gross primary production (GPP) and ecosystem respiration (ER) at 11 reaches from June through September in the eutrophic Klamath River, where a gradient of flow and substrate stability below hydroelectric dams facilitate variation in vegetation assemblages. We scaled percent cover of macrophytes and filamentous algae from snorkeling surveys at the 11 reaches to biomass (AFDM, g/m2). Macrophytes were dominant at reaches below the dams and declined with downriver distance from the dams. Cladophora replaced macrophytes from ~150 km downstream from the dams to the estuary. Reach mean and maximum GPP were not related to total vegetation biomass or vegetation type, but mean and maximum ER were higher at sites with more macrophyte biomass, driving lower rates of summer mean net ecosystem production (NEP) at macrophyte-dominated sites. Declines in the ration of GPP to ER following the GPP peak drove the lower seasonal means of NEP at macrophyte-dominated sites.
- Biological interactions
- Ecosystem functioning
- Energy flows
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Presenters/Authors
Laurel Genzoli
(), University of Montana, laurel.genzoli@umontana.edu;
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Robert O. Hall
(), Flathead Lake Biological Station, University of Montana, bob.hall@flbs.umt.edu;
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