Oxygen levels have dropped in hundreds of lakes in the United States and Europe over the last 40 years, a new study has found. AP PHOTOMONTANA: Oxygen levels have dropped in hundreds of lakes in the United States and Europe over the last four decades, a new study found. Researchers examined the temperature and dissolved oxygen - the amount of oxygen in the water - in nearly 400 lakes and found that declines were widespread. The deep water drop in oxygen levels is critical for aquatic organisms that are more sensitive to temperature increases, such as cold water fish. In these lakes, he said, dissolved oxygen was "very low" in deep waters and was unlivable for many species.

Source: Manila Times June 03, 2021 16:18 UTC