Oxygen levels have dropped in hundreds of lakes in the United States and Europe over the last four decades, a new study found. And the authors said declining oxygen could lead to increased fish kills, algal blooms and methane emissions. Researchers examined the temperature and dissolved oxygen — the amount…
About a quarter of the lakes examined showed increasing oxygen in surface waters, which researchers says is a bad sign because it's likely attributable to increased algal blooms
June 3, 2021 Share
Oxygen levels have dropped in hundreds of lakes in the United States and Europe over the last four decades, a new study found.
And the authors said declining oxygen could lead to increased fish kills, algal blooms and methane emissions.
Researchers examined the temperature and dissolved oxygen the amount of oxygen in the water in nearly 400 lakes and found that declines were widespread. Their study, published Wednesday in the journal Nature, found dissolved oxygen fell 5.5 % in surface waters of these lakes and 18.6% in deep waters.
The authors said their findings suggest that warming temperatures and decreased water clarity from human activity are causing the oxygen decline.
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