Across the United States, the health of lakes is rapidly declining, putting vital ecosystems, recreational activities, and local economies at risk. Environmental experts are now calling for a major shift in how lakes are managed, pushing for long-term, science-based solutions that tackle the root causes of degradation rather than temporary fixes that often do more harm than good.
Dr. Wayne Carmichael, a renowned aquatic toxicologist, has been vocal in his criticism of traditional approaches to managing lake health. He points out that while chemical treatments like algaecides and biocides may seem to offer a quick solution to problems like harmful algae blooms (HABs), these methods typically worsen the issue over time.
“Applying chemicals to control algae may temporarily improve a lake’s appearance, but it does nothing to address the underlying issues,” Carmichael said. “In fact, it often accelerates the degradation process, creating a vicious cycle that harms the ecosystem.”
The dangers of quick fixes
Harmful algae blooms, characterized by the overgrowth of toxic cyanobacteria, are a visible sign of a lake in distress. These blooms not only damage aquatic life but can also pose health risks to humans, emitting foul odors and sometimes leading to large-scale “fish kills.” In many cases, local authorities rely on short-term chemical solutions to eliminate the algae, often just before major holidays or events that bring visitors to lake areas.
However, Carmichael warns that this practice is a dangerous cycle. When algae are killed off en masse, they release toxins into the water. The dead organisms then settle on the lakebed, where they decompose and fuel further nutrient recycling. This feeds future blooms, making them more frequent and severe. Additionally, algaecides tend to be more effective at killing beneficial algae than toxic cyanobacteria, giving the harmful organisms a competitive advantage in the aftermath of treatment.
“Algaecides can exacerbate the problem. You may see a short-term improvement, but the lake’s ecosystem is actually being pushed further out of balance,” Carmichael explained.
Eutrophication: the root cause
At the heart of the issue is eutrophication, the process by which lakes become overly enriched with nutrients—particularly nitrogen and phosphorus—from sources like agricultural runoff, urban development, and sewage discharges. These nutrients, which collect in lake sediments, provide the perfect conditions for harmful algae to thrive. As temperatures rise due to climate change, eutrophication is further accelerated, making it harder for lakes to recover naturally.
“Eutrophication is the driver behind the degradation of our lakes,” Carmichael said. “The nutrient overload creates a feedback loop that perpetuates harmful algae blooms, ultimately resulting in a collapse of the lake’s ecological balance.”
A holistic, science-based approach
To truly restore lakes to health, experts like Carmichael are advocating for a science-based, long-term approach that addresses the root causes of eutrophication. This strategy involves improving the management of lake sediments, boosting oxygen levels, and using biological solutions to revitalize the ecosystem.
One promising technology is Rapid Acting Dissolved Oxygen Restoration (RADOR), which increases oxygen levels throughout the water column. Studies show that maintaining stable oxygen levels can help prevent the release of nutrients from lake sediments, thereby reducing the conditions that lead to algae blooms.
“RADOR systems work by introducing dissolved oxygen from the bottom of the lake to the surface, which helps stop the nutrient recycling that fuels harmful algae blooms,” said Dave Shackleton, president of Clean-Flo International, a leader in water management solutions. “By restoring oxygen levels, we can revive the natural processes that clear out excess nutrients, ultimately helping fish populations and improving water quality.”
Bioaugmentation and nutrient recycling
Another critical component of a science-based approach is bioaugmentation, which involves adding beneficial microorganisms to break down organic matter and consume excess nutrients. These microorganisms, along with aerobic bacteria, help decompose organic muck in a natural way, enhancing the lake’s food web and providing better nutrition for aquatic life.
“Instead of just removing nutrients physically, bioaugmentation allows nutrients to be recycled back into the lake’s ecosystem in a way that promotes healthy growth, rather than harmful algae dominance,” Shackleton explained.
This process helps restore the nutrient-clearing capacity of the food web, which in turn depletes the nutrient stockpiles in the sediment. Over time, this reduces the likelihood of future harmful algae blooms and improves the overall health of the lake.
Addressing the big picture
Experts stress that while these techniques are highly effective, they are part of a broader strategy that involves continuous monitoring and adaptive management. Carmichael emphasized that simply observing lake health is not enough—proactive measures must be taken to reverse damage and prevent future issues.
“The key is to assess the entire ecosystem, not just the symptoms. We need to move beyond treating visible problems and focus on building resilience in these water bodies,” Carmichael said.
By adopting a comprehensive, science-based approach, local governments, environmental agencies, and lake management organizations can significantly improve the long-term health of lakes. This shift from short-term fixes to sustainable solutions is critical in ensuring that lakes remain vibrant ecosystems for future generations, providing recreational opportunities and supporting biodiversity.
A call to action
As lakes across the nation continue to face increasing pressure from nutrient pollution and climate change, Carmichael and other experts are urging policymakers and lake managers to embrace these science-driven strategies. The time to act is now, they say, before the damage becomes irreversible.
“Working with nature, rather than against it, is key to restoring lake health,” Shackleton said. “By addressing the root causes of degradation, we can turn the tide and help our lakes recover—ensuring they thrive for generations to come.”
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