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Why we need sharks: the true nature of the ocean's 'monstrous villains'

Sharks matter not just because they can be useful for humans, however, but entire ocean ecosystems. “Lots of shark species have been shown to be keystone predators,” says Graham. “They maintain balance in ecosystems and keep things in order, removing weaker, sicker prey and stopping any single species from exploding in numbers and taking over.” One study comparing remote islands in the Central Pacific showed that when sharks are fished out, coral reefs can become dominated by small fish and overrun by algae. “We don’t understand until we lose the species how important it was,” says Graham. Read more...

 

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