Atlantic Ocean wide
The Biodiversity Beyond National Jurisdiction (BBNJ) agreement – often known as the High Seas Treaty – came into force in January this year following almost two decades of negotiations.
Its key objectives are the conservation and sustainable use of marine biological diversity in areas which lie outside any single country's jurisdiction, remote areas that make up roughly two-thirds of the global ocean – areas which remain largely unexplored but hold as yet unquantified levels of valuable biodiversity and resources.
A new study published in the journal npj Ocean Sustainability says while there has been considerable research into the international policy implications of implementing the agreement, there has until now been a lack of information on how science can play its role in delivering the objectives.
To address this, a group of internationally renowned experts in marine science and policy – led by Lecturer in Marine Conservation Dr Claire Szostek in our School of Biological and Marine Sciences – conducted a wide-ranging review of existing science that can support the implementation of the agreement and the gaps that need to be filled.
This involved taking each of the four pillars of the agreement and exploring current knowledge surrounding them, identifying where existing technologies can be adapted or further developed, or if novel, emerging technologies are required, and how investment is needed to up-scale data collection and support capacity building in less developed nations, in order to meet the requirements of the Treaty. The authors also showcase examples of relevant science and lessons-learned on solutions.
Based on their analysis, the researchers say there are considerable challenges – ranging from the lack of basic biodiversity monitoring and long-term time series, through to understanding of processes such as connectivity between areas at large scales or depths – which they believe could presently hamper the BBNJ’s implementation from a scientific and technological perspective.
However, they say their analysis also shows how major scientific and technical developments in recent years – including greater use of marine autonomous vessels to conduct surveys and artificial intelligence to analyse data – could help address these challenges and gaps.
Using this information they have develop a solutions-based roadmap which they believe can deliver the science required to fulfil the BBNJ Agreement objectives, which they intend to assist governments and policymakers in ensuring it can be delivered as an effective and global effort to protect marine biodiversity.
Dr Szostek was until recently a Senior Scientist at Plymouth Marine Laboratory (PML), and the study also involved a number of other researchers from PML, The Nature Conservancy and The Natural History Museum.

The BBNJ agreement is a major global achievement that has great potential when it comes to protecting some of the most remote and pristine parts of our ocean.

It has taken a long time and a lot of effort to reach this point, but until now focus has been on policy, with no clear and concise picture of how the agreement can be implemented from a scientific perspective. Our study delivers that, providing a solutions-focussed pathway to implementing the agreement and helping drive the realisation of equitable, sustainable and resilient management of the high seas.

Claire SzostekDr Claire Szostek
Lecturer in Marine Conservation

The study has been published just weeks after the Third BBNJ Symposium, which brought together scientists, policymakers, practitioners, Indigenous Peoples and Local Communities (IPLCs), civil society and other stakeholders to explore the role of science and knowledge in implementing and governing the BBNJ agreement.

A roadmap to enhance data resources and sharing

After analysing the BBNJ Agreement objectives, and reviewing the science already in place to meet them, the researchers have suggested a five-point action plan which they believe will enable science and policy communities to better support the agreement:
  • Action 1 – Embrace technological advancements: While maintaining existing time series and traditional taxonomic expertise is imperative, technological advances are necessary for improved data collection in remote ocean locations;
  • Action 2 – Upscale spatial-temporal coverage and sharing of data: Improvement in the pipeline from data-to-tools is required, including greater interoperability between global databases and maintaining common metadata standards;
  • Action 3 – Novel funding sources and data collection platforms: The inaccessibility of Areas Beyond National Jurisdiction, coupled with a challenging funding climate requires more enterprising approaches to data collection, such as utilising fishing vessels as research platforms;
  • Action 4 – Design marine spatial planning that is climate-smart: Adaptive, climate-smart approaches for area-based management tools are essential, so that management remains effective as species ranges shift under changing ocean conditions, and to protect high carbon areas of the seafloor, using conservation to deliver mitigation;
  • Action 5 – Build capacity and share resources: Effective implementation of BBNJ Agreement activities requires international collaboration, supported by alignment of effort across conventions.
All of this, they add, needs to occur with mechanisms that can be transferred at a global scale rather than just at a national level so that the measures can be implemented fairly across both developed and developing countries.

The BBNJ is an incredible opportunity, including in terms of how it will consolidate and achieve global marine protection goals. But making the rules is actually the easier part – ensuring delivery is where the real challenge lies. This unprecedented exercise in global diplomacy requires the strategic mobilisation and utilisation of the best available scientific data, expertise and technology. Furthermore, it will require major capacity-building in those geographic areas where resources have historically been limited or inaccessible.

Professor Matt Frost
Honorary Professor at the University of Plymouth
Head of the International Office at PML 

For States to meet their commitments to protect the global ocean, we will have to get serious about understanding the high seas. Fortunately, we already know enough to get started. For example, the Walvis Ridge acts as a biological bridge from Namibia’s continental shelf out to the mid-Atlantic Ridge, even though the details remain unstudied. There are many such ecologically significant areas that that deserve our research attentions and protections.

Dr Jeff Ardron
Africa Oceans Director at The Nature Conservancy

The new Treaty marks a new and exciting prospect for managing and protecting marine biodiversity, and a global determination to improve how we protect the oceans. The next challenge is how we put this into practice. The number of species of microorganisms, animals and plants in the oceans of our world is huge – but we know surprisingly little about what they are or how they live. Every year many species new to science are discovered and named – but there are many more which are awaiting analysis. Part of the roadmap to implementing the treaty is improvement of our data collection and the process of identification, description and monitoring of oceanic biodiversity. The political will that enabled the treaty must now turn to supporting the science that will make it work.

Chris Lyal
Scientific Associate at the Natural History Museum, London
  • The full study – Szostek et al: Science challenges and solutions to support implementation of the Biodiversity Beyond National Jurisdiction Agreement – is published in npj Ocean Sustainability, DOI: 10.1038/s44183-026-00191-4.
Dr Claire Szostek is a marine ecologist with her primary interests involving research on the impact humans are having on marine environments. This includes looking at the environmental impacts of the commercial fishing and offshore renewable energy sectors, and actions that can be taken to maintain and restore marine biodiversity.
She is currently pursuing a number of research projects in these fields, and shares her experience and expertise with students through modules that can be taken as part of the BSc (Hons) and MSc Marine Conservation courses, and various other programmes within the University’s School of Biological and Marine Sciences.
Dr Claire Szostek, Lecturer in Marine Conservation at the University of Plymouth