Report: "Catastrophic" Marine Heatwaves Will Hurt Entire Ecosystems, Not Just Remaining UK Fisheries

Britain is facing a future of increasingly catastrophic marine heatwaves that could destroy shellfish colonies and fisheries and have devastating impacts on communities around the coast of the UK. That is the stark conclusion of a new report by the National Oceanography Centre (NOC), based in Southampton, which is pressing for the launch of a targeted research programme as a matter of urgency to investigate how sudden temperature rises in coastal seawater could affect marine habitats and seafood production in the UK.

Across the planet marine heatwaves are becoming more frequent and intense as rising fossil fuel emissions force up atmospheric temperatures across the globe, causing the sea to warm. These events not only disrupt shellfish colonies and fisheries, but also cause the bleaching of coral reefs, the spread of harmful algal blooms, the destruction of seagrass meadows, and mass mortality of fish, seabirds and marine mammals.

“Marine heatwaves have catastrophic impacts and we need to be prepared for them. At present, we are not and that position needs to be rectified as a matter of urgency,” said Dr Zoe Jacobs, the lead author of the NOC report, Marine heatwaves and cold spells in the Northeast Atlantic: what should the UK be prepared for? “We need to know how these marine heatwaves are going to affect plants and animals that live in the sea and find ways to protect them, as well as the coastal communities that depend on them.”

In early summer 2023 Britain was engulfed in a marine heatwave in which major rises in the temperature of sea water were experienced off the north-east coast of England and off the west of Ireland. For more than two weeks, the sea in these regions was around five degrees above normal temperatures, smashing records for late spring and early summer. The Met Office reported that the North Sea and north Atlantic experienced higher temperatures at the same time, with sea temperatures reaching an all-time high, according to records that date back to 1850. As global temperature continues to soar, scientists believe it is inevitable that many more of these record-breaking heatwaves will affect water around Britain and Ireland in the near future, with the report by the NOC highlighting three main areas of concern.

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https://www.theguardian.com/environment/2024/nov/23/catastrophic-marine-heatwaves-are-killing-sealife-and-causing-mass-disruption-to-uk-fisheries