Thursday, 26 September 2019

Jellyfish thrive in the man-made disruption of the oceans


SEPTEMBER 24, 2019

by Laure Fillon
Jellyfish are breeding at a much higher rate than before, thanks to changes in their enviroment wrought by human activity
Thousands of them plague our beaches to the horror of holidaymakers who dread their sting, but thanks to man's disruption of the oceans, jellyfish are thriving.
Jellyfish have been on Earth longer than we have—they are believed to have roamed the oceans for nearly 600 million years.
But human activity, from over-fishing to plastic waste and climate change, has created an environment in which they are even more at home.
The proliferation of the jellyfish could lead to what some observers are calling the "jellyfication" of the oceans, which are facing profound changes according to a draft UN report due out on Wednesday.
Fabien Lombard, a French marine biologist at the Sorbonne University specialising in the ecology of plankton and jellyfish, would not go that far.
"There are more jellyfish in certain zones in the world," he told AFP: the Black Sea, off the Namibian coast and the Sea of Japan.
It is not clear if their presence has increased in other parts of the world, because it is difficult to actually count them, although worldwide database was set up in 2014 to track them.

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