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英国周边海域升温后，鱼类种类未必“全面变多”。Cefas 牵头、刊于 Science Advances、并经 2026 年 11 月 5 日《卫报》等报道的四年推估显示：到本世纪中叶，鱼类与海底无脊椎动物多样性或约增 12%，而浮游植物与浮游动物多样性或分别约降 3% 与 7%。阅读时可留意 marine、project、climate、security、evidence 等词，并注意作者强调浮游生物减少可能扰乱食物网。

正文

Warming seas around Britain and Ireland may not simply bring more kinds of marine life. A four-year project led by the Centre for Environment, Fisheries and Aquaculture Science, or Cefas, and reported on 5 November 2026, projects that heat could reshuffle the ocean food web in uneven ways by mid-century. Partners included the University of East Anglia, the Marine Biological Association, and institutes in Norway, the Netherlands, and Denmark.
Researchers examined four living groups that keep marine systems running: tiny plant-like plankton, animal plankton, seabed invertebrates, and fish. Using long survey records and advanced models, they projected how diversity may change across the north-east Atlantic under a path of about three degrees Celsius of warming by 2100. The southern North Sea is already among the world’s twenty fastest-warming marine climate hotspots over the past fifty years.
The main surprise challenges a common belief. In middle latitudes, scientists often expect overall diversity to rise as warm-water species arrive from the south faster than cold-water species leave for the north. Earlier Cefas work on fish alone had pointed to climate winners such as anchovy and seabass, and losers such as Atlantic cod. The new projections, however, suggest a split across the food web. Diversity of fish and seabed invertebrates could increase by about twelve percent by 2050, while plant-like plankton may fall by about three percent and animal plankton by about seven percent.
Study leaders Elena Couce and Lily Greig warn that more predators with fewer prey types could disrupt energy flow through the food chain. Gains among fish therefore do not prove that the ocean system as a whole is becoming stronger or safer. If prey diversity drops while predator diversity rises, food webs may become less stable, with risks for catches that depend on plankton production. Outside reporting in The Guardian stressed the same caution for food security and ocean health.
The team used multiple long-term datasets and machine-learning methods to map where biodiversity may change fastest. The work has already been submitted to a government review of marine protected areas and fishery measures. The authors do not claim that every local fishery will fail, and they note that model skill is stronger for fish and seabed animals than for plankton. Still, the evidence suggests that climate policy for the sea must track plankton as carefully as fish. Counting only winners higher in the food web could hide early stress at the base that supports later catches.

新闻来源

• The Guardian · Warming UK seas could ‘fundamentally reshape marine ecosystems’ – report (5 Nov 2026)
• Science Advances · From plankton to fish: 21st-century redistribution of marine biodiversity and the changing role of rare species (DOI 10.1126/sciadv.aee7253)
• Cefas Data Hub · Metric projections for NE Atlantic assemblages (DOI 10.14466/CefasDataHub.193)

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