A Surge of Marine Heat Waves Threatens to Scramble Ocean Life
Fueled by climate change and a strengthening El Niño, record-setting marine heat waves are gripping oceans worldwide and playing havoc with sea life. Mounting evidence from recent events suggests the damage could be severe and long-lasting, both onshore and off.
By Jim Robbins • September 3, 2026
The common octopus is a warm water species that usually lives in the temperate waters of the Mediterranean. But last year, octopus larvae hitchhiked across the English Channel attached to plankton, resulting in an octopus bloom off England’s coast. This year, the bloom is the largest it’s been in 75 years.
Normally, octopus larvae that drift into cold waters die. But this year’s bloom, experts say, is the result of an unusually intense marine heat wave off of Devon and Cornwall, which raised water temperatures up to 9 degrees F above normal.
The change in species has been https://e360.yale.edu/features/marine-heat-waves
Published at the Yale School of the Environment
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