2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/07/2017 | 9:30 AM - 9:45 AM | Phosphorus Releases From Glen Canyon Dam Control Riverine Primary Production and Higher Trophic Levels Up To 120 Km Downstream | 302B
Phosphorus Releases From Glen Canyon Dam Control Riverine Primary Production and Higher Trophic Levels Up To 120 Km Downstream
Dams can dramatically alter the transport of nutrients through river networks and can also disrupt downstream community structure. Still, the linkages between dam-induced changes in water chemistry and riverine food webs are not well understood. Here, we use high frequency dissolved oxygen measurements in combination with an inverse modeling approach to estimate daily rates of gross primary production for five years in the Colorado River at a site 120 kilometers downstream of Glen Canyon Dam. We compared these rates to monthly nutrient concentrations at the outflow to Lake Powell and to quarterly measurements of macroinvertebrate biomass and native fish condition in the Colorado River. Soluble reactive phosphorus concentrations at the dam outflow were positively related with early spring (February-April) and pre monsoon (May-July) primary production across five years. Seasonal primary production was also positively related to invertebrate drift biomass and the condition of native fish. We hypothesize that phosphorus limitation below Glen Canyon dam lowers production at the base of the food web with consequences for higher trophic levels.
- S24 Towards a predictive freshwater ecology: using time-series data to understand and forecast responses to a changing environment
- S19 Elements and energy as fundamental currencies of nature: using ecological stoichiometry as a tool to advance the sustainability of freshwater ecosystems
- C32 Primary and Secondary Production
Presentation:
This presentation has not yet been uploaded.
Handouts:
Handout is not Available
Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference
Presenters/Authors
Bridget Deemer
(), U.S. Geological Survey, Southwest Biological Science Center, bdeemer@usgs.gov;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Charles Yackulic
(), USGS Southwest Biological Science Center, Grand Canyon Monitoring and Research Center, cyackulic@usgs.gov;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Robert O. Hall
(), Flathead Lake Biological Station, University of Montana, bob.hall@flbs.umt.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Ted Kennedy
(), USGS Southwest Biological Science Center, Grand Canyon Monitoring and Research Center, tkennedy@usgs.gov;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Jeffrey Muehlbauer
(), USGS Grand Canyon Monitoring and Research Center, jmuehlbauer@usgs.gov;
ASHA DISCLOSURE:
Financial -
Nonfinancial -