Researchers from multiple institutions across Europe have completed a four-year study examining how climate change will affect marine life around the UK and north-east Atlantic. The study projects significant shifts in ocean biodiversity under a scenario of 3 degrees Celsius warming by 2100, challenging conventional assumptions about how marine ecosystems respond to temperature increases in mid-latitude regions.
The research found that warming will not uniformly increase or decrease biodiversity across all marine species. Instead, projections indicate an uneven distribution of climate impacts throughout food webs. Fish and seabed invertebrates are expected to gain diversity by approximately 12% by mid-century, while key plankton groups that form the foundation of marine food chains could decline substantially. Specifically, phytoplankton diversity may drop by about 3% and zooplankton by about 7% by 2050.
This projected imbalance between predators and prey presents risks for ocean health and food security. When predator diversity increases while prey diversity falls, the resulting disruption to marine food chains could weaken overall ecosystem resilience. The waters around the British and Irish Isles, particularly the southern North Sea, have already been identified as among the fastest-warming marine regions globally over the past 50 years.
The interdisciplinary team employed advanced machine-learning techniques and long-term datasets to model biodiversity changes across multiple marine species groups. The findings have already been submitted to government reviews of marine protected areas and fishery management strategies. Researchers emphasize that policymakers must account for climate-driven biodiversity shifts when developing future marine management plans, using the study results as an early warning system for ecosystem changes.
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