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Marine heatwaves are not a dominant driver of change in demersal fishes

Marine heatwaves have been linked to negative ecological effects in recent decades1,2. If marine heatwaves regularly induce community reorganization and biomass collapses in fishes, the consequences could be catastrophic for ecosystems, fisheries and human communities3,4. However, the extent to which marine heatwaves have negative impacts on fish biomass or community composition, or even whether their effects can be distinguished from natural and sampling variability, remains unclear. We investigated the effects of 248 sea-bottom heatwaves from 1993 to 2019 on marine fishes by analysing 82,322 hauls (samples) from long-term scientific surveys of continental shelf ecosystems in North America and Europe spanning the subtropics to the Arctic. Here we show that the effects of marine heatwaves on fish biomass were often minimal and could not be distinguished from natural and sampling variability. Furthermore, marine heatwaves were not consistently associated with tropicalization (gain of wa ....

North Sea , Oceans General , France General , United States , Le Grix , Pacific Ocean , Atmospheric Administration , Rr Core Team , Us South Atlantic Region National Oceanic , Change Biol , Alaska Pacific , World Fisheries , Remote Sens , Status Report , Atlantic Region , National Oceanic , Southern Gulf , Lawrence Atlantic Herring , Canadian Science Advisory Secretariat , West Hawai I , Special Report , Global Warming , Paris Agreement , Statistical Computing , Marine Species , Discrete Global ,