Protection for high seas is crucial to safeguarding vulnerable coastal communities – new research

Key areas of the Indian Ocean, Bay of Bengal and the Pacific should be designated protected areas in order to safeguard vulnerable coastal communities’ livelihoods, new research published this week reveals.
Press release, 11 March 2019


‘Ecological connectivity between the Areas Beyond National Jurisdiction and coastal waters’, led by researchers from IIED and the National Oceanography Centre (NOC), demonstrates that coastal communities in least developed countries (LDCs) are highly dependent on key areas of the ‘high seas’.

These are the central Indian Ocean (the Mascarene Plateau beyond national jurisdiction), the northern Bay of Bengal and the ‘high seas pockets’ of the Pacific Islands. This is despite their being more than 200 nautical miles from coastlines, which currently are largely ungoverned international waters.

These areas are critical to the overall livelihoods of coastal LDCs for employment, food supply and income opportunities. They are also crucial to the life cycles of fish stocks, their development and migration as well as for carbon sequestration, which is a key process for mitigating climate change and sea level rise. Many areas of the high seas are already being impacted by pollution, including from plastic contamination and shipping, overfishing, mining and geoengineering experiments.

The research shows how coastal LDCs are directly affected by activities that take place far off their coasts – beyond their national boundaries. Researchers found that Kirabati, Liberia, Somalia and Tanzania’s coasts are the most connected developing countries to Areas Beyond National Jurisdiction (ABNJ). 

For example, on a timescale of six months, 60% of Somalia’s coast is impacted by waters that originated in the international waters due to ocean connectivity.

Ecological connectivity between ABNJ and coastal waters occurs through two distinct processes: passive circulation-driven connectivity and migratory connectivity. Circulation connectivity between coastal waters and ABNJ depends on the prevailing direction, timescale and variability of ocean currents and is responsible for the spread of the larvae of the numerous marine species.

The complex ways these various factors can interact means that close proximity of coastal waters to ABNJ is not always a good indicator of strong connectivity. Most coastal regions are connected to other, often remote, regions due to the presence of significant boundary currents or features such as coastal upwelling.

Migratory connectivity is the geographic linking of species and populations between one life cycle stage and another. Numerous migratory species of conservation importance, including highly migratory fish such as tuna, travel long distances across the jurisdictions of multiple states and ABNJ. 

A recent study of the migration of 14 marine predators – from leatherback sea turtles to albatross – found that, cumulatively, these species visited 86% of Pacific states, with some spending up to three-quarters of their annual cycles in ABNJ.

The research, which appears in the current issue of Marine Policy, is based on experiments designed to establish the origins of least developed countries’ coastal waters. Carried out four times a year from 2005-14, it used ocean modelling to track the rate at which virtual particles were arriving to the coastal zones from the most closely connected points of the ABNJ.  

Dr Ekaterina Popova, senior research scientist, Marine Systems Modelling at the NOC, who led on this research, said:
“When the high seas are viewed from a coastal perspective, they are often considered as remote and inconsequential for the coastal communities whose life is dependent on the living marine resources. However, nothing can be further from the truth.

"Growing scientific evidence points towards strong ecological connectivity between the high seas and the coastal zones. Thus when marine protected areas are proposed in the high seas, their locations must be chosen not only to protect biodiversity within these areas, but also to safeguard interests of poor coastal communities in their downstream zone of influence.”

Dr Essam Yassin Mohammed, head of blue economy at IIED and one of the report’s authors, said: “The science is clear. These areas of the high seas directly affect the lives of millions of women, children and men living in developing coastal countries. Any treaty governing international waters must prioritise vulnerable people’s needs as well as the ecological and biological significance when designating an area for ocean protection. Any activity that is likely to affect coastal areas through ocean circulation and migration connectivity must be given special protection and be subject to environmental impact assessments.”

On 25 March 2019, the United Nations enters its second round of negotiations, on developing an internationally legally binding instrument (ILBI) to govern the high seas under the UN Convention on the Law of the Sea on the conservation and sustainable use of marine biological diversity of ABNJ.


For more information or to arrange an interview, contact Beth Herzfeld, IIED head of media, on +44 (0)7557 658 482 or email [email protected]

Notes to editors

  • Read ‘Ecological connectivity between the Areas Beyond National Jurisdiction and coastal waters: safeguarding interests of coastal communities in developing countries
  • In the Indian Ocean Tanzania showed the strongest connectivity to ABNJ, closely followed by other East African coastal states, including Somalia. In the Pacific, Kiribati showed the strongest connectivity, closely followed by Tuvalu, Vanuatu and the Solomon Islands. In the Atlantic Ocean, Liberia showed the strongest connectivity.
  • Small-scale fisheries supply 50% of the world’s seafood and employs more than 90% of fishers. The supply chains associated with small-scale fisheries provide a livelihood for millions of women.
  • Each connectivity experiment took place four times a year: January, April, July and October in order to take account interannual and seasonal variability of ocean circulation in the characterisation of coast to ABNJ upstream (backwards) connectivity.
  • The ‘high seas pockets’ of the Pacific Islands is a region of ABNJ that is entirely surrounded by the exclusive economic zones of adjacent Pacific Island states.
  • IIED is a policy and action research organisation. It promotes sustainable development to improve livelihoods and protect the environments on which these livelihoods are built. IIED specialises in linking local priorities to global challenges. Based in London, UK it works in Africa, Asia, Latin America, the Middle East and the Pacific, with some of the world's most vulnerable people to strengthen their voice in the decision-making arenas that affect them – from village councils to international conventions.
  • The National Oceanography Centre (NOC) is the UK’s leading institution for integrated coastal and deep ocean research. The NOC undertakes and facilitates world-class, agenda-setting scientific research to understand the global ocean by solving challenging multidisciplinary, large scale, long-term marine science problems to underpin international and UK public policy, business and wider society outcomes.

For more information or to request an interview, contact Simon Cullen: 
+44 7503 643332 or [email protected]