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  2. Oxygen minimum zone - Wikipedia

    en.wikipedia.org/wiki/Oxygen_minimum_zone

    Open ocean areas with no oxygen have grown more than 1.7 million square miles in the last 50 years, and coastal waters have seen a tenfold increase in low-oxygen areas in the same time. [47] Measurement of dissolved oxygen in coastal and open ocean waters for the past 50 years has revealed a marked decline in oxygen content.

  3. Ocean deoxygenation - Wikipedia

    en.wikipedia.org/wiki/Ocean_deoxygenation

    Global map of low and declining oxygen levels in coastal waters (mainly due to eutrophication) and in the open ocean (due to climate change).The map indicates coastal sites where oxygen levels have declined to less than 2 mg/L (red dots), as well as expanding ocean oxygen minimum zones at 300 metres (blue shaded regions).

  4. Dead zone (ecology) - Wikipedia

    en.wikipedia.org/wiki/Dead_zone_(ecology)

    Dead zones are hypoxic (low-oxygen) areas in the world's oceans and large lakes. Hypoxia occurs when dissolved oxygen (DO) concentration falls to or below 2 ml of O 2 /liter. [2] When a body of water experiences hypoxic conditions, aquatic flora and fauna begin to change behavior in order to reach sections of water with higher oxygen levels.

  5. Hypoxia (environmental) - Wikipedia

    en.wikipedia.org/wiki/Hypoxia_(environmental)

    Global map of low and declining oxygen levels in the open ocean and coastal waters, 2009. [1] The map indicates coastal sites where anthropogenic nutrients have exacerbated or caused oxygen declines to <2 mg/L (<63 μmol/L) (red dots), as well as ocean oxygen minimum zones at 300 m (blue shaded regions).

  6. Low-oxygen levels off coast a concern for fisheries - AOL

    www.aol.com/news/low-oxygen-levels-off-coast...

    Sep. 14—Low-oxygen levels off the coast of Oregon and Washington state hit earlier than usual this spring and have lasted longer than any other hypoxic event recorded on the West Coast in the ...

  7. Earth’s Disastrous 10th Tipping Point Has Been Identified - AOL

    www.aol.com/earth-disastrous-10th-tipping-point...

    According to the researchers, lakes and reservoirs have experienced oxygen losses of 5.5 percent and 18.6 percent respectively in the past 45 years, and the oceans have dropped by 2 percent—a ...

  8. Effects of climate change on oceans - Wikipedia

    en.wikipedia.org/wiki/Effects_of_climate_change...

    Overall ocean oxygen concentrations are estimated to have declined 2% over 50 years from the 1960s. [56] The nature of the ocean circulation means that in general these low oxygen regions are more pronounced in the Pacific Ocean. Low oxygen represents a stress for almost all marine animals. Very low oxygen levels create regions with much ...

  9. Microbiology of oxygen minimum zones - Wikipedia

    en.wikipedia.org/wiki/Microbiology_of_oxygen...

    Open ocean areas with no oxygen have grown more than 1.7 million square miles in the last 50 years, and coastal waters have seen a tenfold increase in low-oxygen areas in the same time. [34] Measurement of dissolved oxygen in coastal and open ocean waters for the past 50 years has revealed a marked decline in oxygen content.