Conservation: Reef sharks are in major decline worldwide
The crash in shark numbers, caused largely by over-fishing, could have dire consequences for corals struggling to survive in a changing climate, researchers have said.
Sharks are top predators, playing a key role in marine ecosystems.
Dr Mike Heithaus of Florida International University, US, said: "At a time when corals are struggling to survive in a changing climate, losing reef sharks could have dire long-term consequences for entire reef systems."
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