2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/27/2021 | 2:00 PM - 3:30 PM | INFLUENCE OF MACROPHYTE GROWTH ON ECOSYSTEM METABOLIC RATES IN SEASONALLY DRY IRRIGATION CANALS | Virtual Platform
INFLUENCE OF MACROPHYTE GROWTH ON ECOSYSTEM METABOLIC RATES IN SEASONALLY DRY IRRIGATION CANALS
Dense growth of aquatic plants can be a nuisance for recreation and water delivery by irrigation canals. Although excessive macrophyte growth is known to influence ecosystem metabolism, including production and respiration, canals that are drained during the winter provide an opportunity to investigate how the relationship between ecosystem metabolism and macrophyte density changes throughout the growing season when the canals are flowing. We investigated how the relationship between macrophyte density and ecosystem metabolism (gross primary production (GPP) and ecosystem respiration (ER)) varied across three irrigation canals during the late summer of 2020, as well as among ecosystem compartments within canals (sediment, water column, macrophytes). Among canals, macrophyte community respiration (CR) (mg/g/hr) was not correlated with macrophyte biomass density (g/m2) nor was sediment CR correlated with sediment organic matter (%). However, we observed a negative relationship between macrophyte biomass density and macrophyte GPP (mg/m2/hr), suggesting that heterotrophic and autotrophic respiration outpaces photosynthesis in these nutrient- and carbon-rich canal ecosystems. Future study will explore how the balance of GPP and ER changes during macrophyte community succession and will evaluate canal ecosystem resilience in response to ultraviolet-C light treatment used to manage macrophytes.
- Ecosystem functioning
- Management
- Anthropogenic
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Presenters/Authors
Meredith Brehob
(), University of Nevada, Reno, meredithbrehob@gmail.com;
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Joanna Blaszczak
(), Global Water Center and Department of Natural Resources and Environmental Science, University of Nevada, Reno, jblaszczak@unr.edu;
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Sudeep Chandra
(), Global Water Center and Biology Department, University of Nevada, Reno, sudeep@unr.edu;
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