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WATER WORLD
Low-oxygen zones in Danish seas double in a year
by Staff Writers
Copenhagen (AFP) Aug 28, 2020

The area of Danish seas affected by low oxygen levels -- a problem triggered by climate change -- has doubled in the space of a year, according to a university report published Friday.

Lack of oxygen in the sea can have grave consequences for the survival of plants, animals and fish.

In the waters of Denmark's exclusive maritime zone, "the total area affected by oxygen depletion was... about 3,300 square kilometres" (1,300 square miles) in August, Aarhus University's National Centre for Energy and Climate (DCE) found, "twice as high as in 2019".

It said the problem was "severe" in around a third of the area.

The area suffered from high levels of runoff from rivers at the beginning of the year, increasing the amount of organic matter and nutrients, the study found, along with "high temperatures in the bottom water and mainly weak winds since the middle of spring".

Increased nutrients in the sea can lead to excessive growth of plants like algae, which ultimately leads to less oxygen in the water as the plants die off and decompose in a process known as eutrophication.

Meanwhile, surface waters hold less oxygen when they are warmer, leading to less circulation with naturally oxygen-poor waters deeper down.

Lack of wind also reduces circulation between shallower and deeper waters.

A 2019 report from the International Union for Conservation of Nature (IUCN) found that ocean oxygen levels had decreased by around two percent between 1960 and 2010.

A fall of between three and four percent is expected between now and 2100 if climate-altering emissions and nutrient discharges continue to grow at their present pace.

Around 700 spots around the world suffer from depleted oxygen levels, compared with just 45 in the 1960s.


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WATER WORLD
Overfishing erased sharks from many of the world's reefs
Washington DC (UPI) Aug 27, 2020
Teams of researchers around the world recently confirmed what many of them suspected - that overfishing wiped out sharks on up to 20% of the world's reefs. A study by the Global FinPrint initiative also confirmed that affluent nations with strict fishing controls, especially the United States and Australia, still have an abundant number of sharks. The global survey of 371 reefs in 58 countries provides a benchmark for future shark studies and clear evidence for supporting conservation, ... read more

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