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Fueled by Pollution and Unsound Policies, Toxic Algae Overtakes Florida Beaches and Waterways

Fueled by Pollution and Unsound Policies, Toxic Algae Overtakes Florida Beaches and Waterways

Sunset over a canal in Cape Coral, Florida, filled with blue green algae.

Parts of South Florida are being inundated by harmful algal blooms, which affect both public health and marine life, including red tide (caused by the alga Karenia brevis) and blue-green algae (more precisely known as cyanobacteria, or Microcystis, which are technically bacteria but commonly referred to as algae).

While both types of toxin-producing algae are normal parts of their environments, the crisis is not. Water pollution and climate change are fueling this supersized toxic algae mess.

Cyanobacteria, or blue-green algae, in a canal near Cape Coral Yacht Club in Florida.
Cyanobacteria, or blue-green algae, in a canal near the Cape Coral Yacht Club in Florida.

Fish kill on a beach in Boca Grande, Florida
Fish kill on a beach in Boca Grande, Florida.

The state’s water quality standards, friendly toward agriculture and real estate development, result in the release of an abundance of nutrients including phosphorus and nitrogen into the water. This influx of growth-inducing nutrients causes marine and freshwater algae populations to explode in what’s called a “bloom.” These blooms can use up much of the oxygen in the water, causing aquatic life to die, in addition to the potentially fatal toxins these algae release.

Storm run-off from agricultural and urban landscapes, laden with fertilizers and animal manure, and badly maintained septic systems contribute to the current crisis. On top of this, massive releases of polluted freshwater, laden with cyanobacteria, from Lake Okeechobee are ending up on both of the state’s coasts. And when the freshwater cyanobacteria hit the saltwater, they die, creating even more nutrients that feed the red tide.

Photographer's sneakers on a concrete seawall on the side of a toxic algae-filled canal in Cape Coral, Florida.
Photographer’s sneakers on a concrete seawall on the side of a toxic algae-filled canal in Cape Coral, Florida.

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Olduvai IV: Courage
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