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Early Warnings of Harmful Algal Blooms in Lakes
Grace Wilkinson
Iowa State University
Early Warnings of Harmful Algal Blooms in Lakes Grace Wilkinson Iowa - - PowerPoint PPT Presentation
Early Warnings of Harmful Algal Blooms in Lakes Grace Wilkinson Iowa - - PowerPoint PPT Presentation
Early Warnings of Harmful Algal Blooms in Lakes Grace Wilkinson Iowa State University In 2017, three out of four Iowa lakes are considered eutrophic or hypereutrophic Average 77% of algae Anoxic bottom waters is cyanobacteria Algal scums in
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In 2017, three out of four Iowa lakes are considered eutrophic or hypereutrophic
- Anoxic bottom waters
- Algal scums
- Taste and odor issues
- Fish kills possible
- Cyanobacteria &
cyanotoxin risk
Average 77% of algae is cyanobacteria in Iowa lakes
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What controls cyanotoxin production?
Microcystin
What controls cyanotoxin production?
Nutrient Availability Temperature Light Intensity Grazing Pressure
Combining genetic techniques with microcystin assays and environmental data to address this question in Iowa lakes
Biomass
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State 1: Clear Water State 2: Algae Dominated
Nutrient Loading
Low High Medium Basin of Attraction High Resilience
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State 1: Clear Water State 2: Algae Dominated
Nutrient Loading
High Resilience Small Perturbation High Medium AC: how much does today look like yesterday?
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State 1: Clear Water State 2: Algae Dominated Low Resilience
Nutrient Loading
High Low
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State 1: Clear Water State 2: Algae Dominated Low Resilience
Nutrient Loading
High Low Small Perturbation
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State 1: Clear Water State 2: Algae Dominated Regime Shift
Nutrient Loading
High Low Medium
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High Frequency Monitoring Thresholds Ecosystem Alarms Alarms
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- Acted on the early warning alarms and intervened
- The lake recovered and did not stay in the bloom state
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Algal Bloom
Are early warnings of HABs detectable in Iowa Lakes?
Data courtesy of Jason Palmer, Iowa DNR
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CuSO4 Addition
Photo: Cal Buelo
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A To Tool fo for Pr Proactive Ma Manage geme ment nt
Herbicide application with minimal ecological and service impact Beach closures to minimize toxin exposure risk Aeration and mixing systems to prevent fish kills
Photo: Ben Wallace
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