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Mystery Event Decimated 90 Per Cent of Shark Diversity 19 Million Years Ago, New Study Finds

Mystery Event Decimated 90 Per Cent of Shark Diversity 19 Million Years Ago, New Study Finds
Researchers say this unidentified event caused a reduction in shark diversity by over 70 percent and almost a complete loss in total abundance
By Edited by Gadgets 360 Newsdesk | Updated: 5 June 2021 12:33 IST
Photo Credit: Pixabay
Highlights
It led to the virtual disappearance of sharks from open-ocean sediments
The cause of the event is still a mystery
A new study has found that a single mysterious event about 19 million years ago wiped nearly the entire population of sharks. Scientists behind the new research say that studying the shark teeth buried in deep-sea sediment, revealed that the current diversity among sharks is only a tiny remnant of a much larger variety that existed back then. They say this unidentified major ocean extinction caused the reduction in the shark diversity by over 70 percent and nearly a complete los ....

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Oceanic sharks and rays have declined by over 70%: study

Updated:
January 30, 2021 13:51 IST
The researchers said 24 of the world s 31 oceanic shark and ray species are now classified as vulnerable, endangered or critically endangered on the IUCN Red List.
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This 2001 photo provided by Dr. Greg Skomal shows a shortfin mako shark off the coast of Massachusetts. | Photo Credit:
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The researchers said 24 of the world s 31 oceanic shark and ray species are now classified as vulnerable, endangered or critically endangered on the IUCN Red List.
The number of oceanic sharks and rays worldwide has fallen by 71% over the last 50 years, according to a study which found that some formerly abundant, wide-ranging species including the Great Hammerhead have declined so steeply that they are now classified as critically endangered. ....

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Number of sharks, rays have fallen more than 70 percent between 1970-2018- Technology News, Firstpost

Number of sharks, rays have fallen more than 70 percent between 1970-2018
While climate change and pollution also imperil shark survival, increased fishing pressure is the greatest threat for every oceanic shark species.
Jan 28, 2021 12:27:39 IST
When marine biologist Stuart Sandin talks about sharks, it sounds like he’s describing Jedis of the ocean. “They are terrific predators, fast swimmers and they have amazing senses they can detect any disturbance in the ocean from great distance,” such as smells or tiny changes in water currents. Their ability to quickly sense anything outside the norm in their environment helps them find prey in the vastness of the open ocean. But it also makes them especially vulnerable in the face of increased international fishing pressure, as global fishing fleets have doubled since 1950. ....

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Dramatic Shark Decline Leaves Gaping Hole In Ocean: Study

For 18 species, the researchers concluded global populations had fallen over 70 percent since 1970.
Tokyo, Japan:
Overfishing has wiped out over 70 percent of some shark and ray populations in the last half-century, leaving a gaping, growing hole in ocean life, according to a new study.
Researchers found alarming declines in species ranging from hammerhead sharks to manta rays.
Among the worst affected is the oceanic whitetip, a powerful shark often described as particularly dangerous to man, which now hovers on the edge of extinction because of human activity.
Targeted for their fins, oceanic whitetips are caught up by indiscriminate fishing techniques. Their global population has dropped 98 percent in the last 60 years, said Nick Dulvy, the study s senior author and a professor at Simon Fraser University (SFU). ....

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