However, the sharks actually spent more time on a minority of the coral reefs. These reefs were healthier and more resilient, due to factors including the eradication of invasive rats and higher populations of birds, which help fertilise the reef. The researchers said this showed that increasing the protection of coral reefs from human-caused damage may help sharks remain on their home reefs. Sharks are cold-blooded and their body temperature is linked to water temperature. “If it gets too hot, they’re going to need to move,” said Dr David Jacoby, a lecturer in zoology at Lancaster University and the leader of the research project. “We think many are choosing to move into offshore, deeper and cooler waters, which is concerning. Some of the sharks were disappearing entirely from the reef for long periods of time. Reef sharks are already absent from nearly 20% of coral reefs globally, partly through [overfishing], and this new finding has the potential to exacerbate these trends.”
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