Warming Seas Threaten North Atlantic Food Webs
A study led by Britain's Cefas projects that rising temperatures could reshape marine ecosystems in the North Atlantic.
Updated on Nov. 8, 2026 in Environmental
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A newly published study in Science Advances projects that warming seas could destabilise North Atlantic marine food webs. Researchers led by Britain's Centre for Environment, Fisheries and Aquaculture Science (Cefas) say key plankton groups could lose species under a scenario of almost 3°C of warming by 2100.
Why it matters
The seas around Ireland and Britain are among the fastest-warming areas over the past half-century and form part of one of 20 global marine climate hotspots. Changes in the base of the food chain could ripple upward to fisheries that millions rely on.
The projection is a modelling study of plankton and fish communities under a scenario of almost 3°C warming by 2100, compared against current conditions in the seas around Ireland and Britain, one of 20 global marine climate hotspots. Exact timing and the net effect on individual fish stocks are not specified in the findings.
The players
Centre for Environment, Fisheries and Aquaculture Science (Cefas)
Cefas is Britain's government science agency that leads marine and fisheries research and led this study.
University of East Anglia
The University of East Anglia is a public research university in Norwich, England, that participated in the study.
The details
Under the warming scenario, key plankton groups lower in the food chain are projected to lose species, which could disrupt marine food webs. Fish diversity may increase as anchovies, seabass and sardines benefit from warmer waters, while Atlantic cod, haddock and coley could be negatively affected according to earlier research.
Timeline
2100: projected warming scenario of almost 3°C.
Within the next three decades: projected serious consequences for food security.
Big Picture
The study extends IPCC assessments documenting rapid warming in the North Atlantic into specific projections for plankton and fish communities. It moves the conversation from temperature trends toward how those trends could restructure the food webs that support fisheries.
Warmer waters could shift which fish species are caught in the North Atlantic, affecting the mix of seafood available over time. Consumers and fishers may see changes in catch composition as food web structures adjust.
The takeaway
Ocean warming affects the whole food chain, not just surface temperatures, so changes in plankton can eventually reach the fish on dinner plates. Following research from institutions such as Cefas helps track how these shifts unfold.
Further reading
Explore more on Environmental coverage for context on how ocean warming is reshaping marine ecosystems.
Source note: This article includes information reported by Ireland Afloat.
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