PeerJ Reviewer Match - Heatwaves effects in marine ecosystems

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Marine heatwaves shift intertidal marine communities in the SW Atlantic

Abstract

Background. Accelerating rates of ocean’s warming is a global threat to coastal marine ecosystems. More frequent heat extremes, also known as marine heatwaves, will likely cause severe impacts on marine ecosystems as species may be unable to tolerate, adapt or recover from these events.

Methods. In this study, we examined the association between the occurrence of marine heatwaves and benthic macroalgal cover at intertidal reefs in the SW Atlantic. The investigate these effects, we monitored in situ temperatures and obtained remote satellite sensing measurements of essential ocean and biodiversity variables at a long-term marine observatory (LTER) in the SE coast of Brazil. The dataset resulted in monthly (December 2018 to May 2022) monitoring of intertidal macroalgal beds and coastal meteo-oceanographic conditions.

Results. Our results revealed that temporal changes in macroalgal cover during the period studied were highly correlated (> 80% association) with marine heatwaves, which were the dominant conditions in this region. Stronger (intensity effect) and prolonged (weeks) events lead to a significant decrease (38% loss) in macroalgal cover with impacts on benthic richness and diversity both locally and regionally. The impacts were more pronounced and drove succession on dominant macroalgal taxa (brown and red algae), which were the least resilient to high temperatures. Although there were indications of macroalgal recovery after 2020, the community did not return to the pre-heatwave composition, revealing that assemblage succession over these macroalgal beds may occur at multi-year time scales. Our study supports previous research indicating that marine heatwaves are becoming more frequent on coast of Brazil, and given the long period for assemblage recovery, we can expect marked decreases in coastal biodiversity in the SW Atlantic.

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