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Scientists were shocked by the high degree of warming in the North Atlantic Ocean this summer, and are concerned about effects on phytoplankton and fish. Intensifying and lengthening marine heatwaves around the globe are also worrying. ....
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 ....
This IIED webinar on Wednesday, 21 September will discuss the topic of special economic zones (SEZ) and the broader questions they raise, particularly in Senegal and Madagascar ....
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