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A marine heatwave drives significant shifts in pelagic microbiology
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Journal Article
A marine heatwave drives significant shifts in pelagic microbiology
2024
Overview
Marine heatwaves (MHWs) cause disruption to marine ecosystems, deleteriously impacting macroflora and fauna. However, effects on microorganisms are relatively unknown despite ocean temperature being a major determinant of assemblage structure. Using data from thousands of Southern Hemisphere samples, we reveal that during an “unprecedented” 2015/16 Tasman Sea MHW, temperatures approached or surpassed the upper thermal boundary of many endemic taxa. Temperate microbial assemblages underwent a profound transition to niche states aligned with sites over 1000 km equatorward, adapting to higher temperatures and lower nutrient conditions bought on by the MHW. MHW conditions also modulate seasonal patterns of microbial diversity and support novel assemblage compositions. The most significant affects of MHWs on microbial assemblages occurred during warmer months, when temperatures exceeded the upper climatological bounds. Trends in microbial response across several MHWs in different locations suggest these are emergent properties of temperate ocean warming, which may facilitate monitoring, prediction and adaptation efforts.
Long-term monitoring revealed that a prolonged marine heatwave drove a profound transition in pelagic microbial assemblages, altering seasonal patterns of diversity and shifting niche conditions to those observed over 1000 km equatorward.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
