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Other Scientists

Assistant Prof.
Assistant Prof.
Research Scientist
Ph.D. Student

The Ecology and Ecosystem Roles of Reef Sharks in the BIOT MPA

Principal Investigators
Other Scientists

Project Overview

One quarter of all shark, ray, skate and chimaera species (chondrichthyans) are threatened with extinction.

Reef sharks continue to be exploited at unsustainable rates despite their important role in coral reef ecosystems. Remote, oceanic coral reefs, such as those within the British Indian Ocean Territory (BIOT) Marine Protected Area (MPA), represent some of the most biologically diverse environments on the planet. These finely balanced ecosystems support numerous resident and migratory large marine vertebrates of both commercial and conservation importance including tunas, billfishes, reef and pelagic sharks, manta rays, sea birds and sea turtles.

Illegal fishing in the area is still a problem and constitute the biggest threat sharks are facing in the MPA. However, it is emerging that the movement patterns of local reef sharks are predictable between monitoring locations and strongly linked to their vulnerability to illegal fishing activity. This knowledge represents a great opportunity to develop more efficient ways to protect these animals in the BIOT MPA and in other remote large  marine protected areas of the planet.

This project combines tracking technologies, genetics, fisheries analyses and stable isotope analyses to understand the spatial ecology, conservation status and ecological role of reef sharks in BIOT. It aims to measure the level of connectivity within the archipelago and assess how behaviour and movement make species more or less susceptible to illegal fishing activity. Results will inform management and enforcement strategies of the MPA and help characterize the conservation and management role of large MPA for large marine animals.

Reef silvertip sharks movements in depth.

Understanding the ecology and movement of sharks in a human-impacted world is therefore both urgent and essential for their long-term persistence.

David Jacoby

Key Facts

25%
of all cartilaginous fish are vulnerable to extinction
419
acoustic tags have been deployed
2.3 million
detections across the archipelago

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