A four-year research study has concluded that rising sea temperatures around the UK and north-east Atlantic could fundamentally alter marine ecosystems within the coming decades. The international research team, led by government scientists, examined how climate change would affect four key groups of marine organisms that sustain ocean food webs in the region.
The findings challenge existing assumptions that warming at temperate latitudes would uniformly increase marine biodiversity. Instead, researchers project an uneven reshuffling of species across the food web. Under a warming scenario of 3C by 2100, fish and seabed invertebrate diversity could increase by approximately 12% by mid-century, while plankton groups—which form the foundation of marine food chains—are expected to decline. Specifically, phytoplankton diversity may drop by about 3% and zooplankton by about 7% over the same timeframe.
This divergence between predators and prey creates potential instability throughout marine ecosystems. Marine scientists involved in the research emphasized that gains in some species groups do not necessarily indicate ecosystem resilience, and could instead signal underlying fragility in food web structures. The work identifies the waters around the British and Irish Isles, particularly the southern North Sea, as among the fastest-warming marine regions globally.
Previous research has identified certain fish species as potential climate “winners”—such as anchovies and seabass—while others including Atlantic cod and haddock face declining suitability in increasingly warm waters. The new study employed advanced machine-learning techniques and long-term datasets to project biodiversity changes through 2100, providing what researchers describe as an early-warning system for ecosystem shifts.
The findings have been submitted to government reviews of marine protected areas and fishery management strategies. Researchers stressed that policymakers must account for climate-driven biodiversity changes when developing conservation and management plans to protect ocean health and food security.
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