2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 3:15 PM - 3:30 PM | ECOHYDROLOGY OF LARGE RIVERS AND IMPLICATIONS FOR MANAGEMENT OF HARMFUL ALGAL BLOOMS | 150 DEF
ECOHYDROLOGY OF LARGE RIVERS AND IMPLICATIONS FOR MANAGEMENT OF HARMFUL ALGAL BLOOMS
The ecohydrology of large rivers is central to preventing or limiting the occurrence, frequency, and extent of harmful algal blooms such as Microcystis. River ecologists have argued for decades that the phytoplankton and food webs of large rivers are not typically nutrient limited as are lakes or headwater streams. Therefore the assumption that nutrients are the sole driver of HABs in large rivers has potentially prolonged the problem. Observation and experimental research on the Ohio River, USA, has demonstrated biota are negatively impacted by high discharge by reducing zooplankton grazing of palatable phytoplankton. At low discharge, zooplankton, particularly large-bodied species with higher grazing rates were more abundant. Additionally, Microcystis blooms have occurred historically in the Ohio during periods of drought and in late summer when discharge is reduced and more light is available. While controlling nutrient runoff is important to reduce export to oceans, inducing mixing in regulated rivers during periods of low flow may be more effective in reducing blooms by decreasing light availability, reduced competition from zooplankton grazing, and overriding phytoplankton adaptations to maintain position in the photic zone.
- Multi-stressors
- Hydrology
- Algae
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Presenters/Authors
Tamara Sluss
(), University of Louisville, tamara.sluss@louisville.edu;
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