As the world warms, dangerous algal blooms are on the rise - NBCNewsMACH
A boat sails through a deepening algae bloom across the Caloosahatchee River on June 27, 2018, in Labelle, Florida.Oct. 17, 2019, 6:23 PM UTCDangerous blooms of algae in freshwater lakes — like those that have caused environmental emergencies in Florida in recent years and in Toledo, Ohio in 2014 — are worsening as the Earth warms.in many of the world’s largest lakes since the 1980s, with lakes that have warmed the least over the past 30 years showing less intense algal blooms.
“That suggests that temperature — and therefore climate change — has a role to play in allowing lakes to recover or not” [from algal blooms], said study co-author Anna Michalak, an environmental engineer at the Carnegie Institution for Science in Stanford, California. “When temperatures get warmer, it can get in the way of management strategies that would otherwise have improved conditions in the lake.
A comparison of photos taken between 1984 and 2013 showed that algal blooms had increased in intensity in at least 22 lakes, including Florida’s Lake Okeechobee. Only six lakes worldwide showed a statistically significant decrease in blooms over that time. Green algae blooms are seen at the Port Mayaca Lock and Dam on Lake Okeechobee on July 10, 2018 in Port Mayaca, Fla.There’s nothing abnormal about occasional algal blooms. They can occur naturally when a lake’s water warms in summer, and can be triggered when fertilizer applied to nearby land washes into lakes. Most disappear on their own within a few weeks.
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