Scientists call for seascape‑scale restoration to revive marine biodiversity

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A new study led by the University of Portsmouth, in collaboration with the Zoological Society of London and the University of Edinburgh, is highlighting the urgency of restoring coastal marine habitats at scale. The research, launched at the International Seascape Symposium II at ZSL, makes the case that habitats such as oyster reefs, kelp forests, saltmarshes and seagrass meadows function as interconnected systems rather than isolated features and that this ecological connectivity is critical for meeting both climate and biodiversity targets.

The findings emphasise that restoring isolated patches of habitat is not sufficient; instead, a seascape‑scale approach is required. Examples from around the world underscore the benefits of this connectivity: in California, seagrass grows more robustly near oyster reefs; in New Zealand, kelp-derived carbon supports fish populations; and in Chesapeake Bay, oyster beds enhance water clarity and nutrient removal.

Importantly, the report warns the UK has already suffered dramatic declines in coastal ecosystems, with up to 95% of oyster reefs and 90% of seagrasses lost. Restoring interconnected marine habitats is now essential to reverse biodiversity loss, boost fish stocks and enhance coastal protection.

The researchers call on policymakers to formally define “seascape restoration,” update marine protected area frameworks, revise environmental assessments, and integrate restoration goals across the land–sea boundary.

What this means:
This study reframes marine restoration in the UK, placing connectivity at its heart. As policymakers design strategies for biodiversity recovery whether under domestic frameworks or the implementation of global agreements they must plan restoration actions that link coastal habitats, not treat them in isolation. This will improve ecosystem resilience, contribute to carbon sequestration, strengthen fish populations and better protect against climate impacts. It also presents a strong impetus for regulatory reform: environmental impact assessments, marine protected areas and restoration funding streams should all reflect the interlinked nature of coastal systems.

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