Marine heatwaves and the collapse of marginal North Atlantic kelp forests.

The average duration of MHW events that crossed mortality thresholds over the past 60 years showed an increasing but insignificant trend in Norway (0.17 ± 0.16 days year −1 ; LM: R 2 = 0.04, p = 0.305) and an increasing trend in the eastern USA (0.20 ± 0.09 days year −1 ; R 2 = 0.13, p = 0.029).

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