Impermanence is an ecological principle1 but there are times when changes occur nonlinearly as abrupt community shifts (ACSs) that transform the ecosystem state and the goods and services it provides2. Here, we present a model based on niche theory3 to explain and predict ACSs at the global scale. We test our model using 14 multi-decadal time series of marine metazoans from zooplankton to fish, spanning all latitudes and the shelf to the open ocean. Predicted and observed fluctuations correspond, with both identifying ACSs at the end of the 1980s4,5,6,7 and 1990s5,8. We show that these ACSs coincide with changes in climate that alter local thermal regimes, which in turn interact with the thermal niche of species to trigger long-term and sometimes abrupt shifts at the community level. A large-scale ACS is predicted after 2014—unprecedented in magnitude and extent—coinciding with a strong El Niño event and major shifts in Northern Hemisphere climate. Our results underline the sensitivity of the Arctic Ocean, where unprecedented melting may reorganize biological communities5,9, and suggest an increase in the size and consequences of ACS events in a warming world.
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The data that support the findings of this study are available from the corresponding author upon request.
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This work was supported by the Centre National de la Recherche Scientifique, Research Programme CPER CLIMIBIO (Nord–Pas-de-Calais), regional programme INDICOP (Pas-de-Calais) and ANR project TROPHIK. The authors thank the French Ministère de l’Enseignement Supérieur et de la Recherche, Hauts-de-France Region and European Regional Development Fund for financially supporting this project. We are indebted to P. Notez for help with computer engineering. A.A. and the Antarctic dataset were supported by the World Wildlife Fund, NERC and DEFRA grant number NE/L 003279/1 (Marine Ecosystems Research Programme) and NERC National Capability grant number NE/R015953/1. P.C.R. was also funded by NERC.
The authors declare no competing interests.
Journal peer review information Nature Climate Change thanks Adrian Stier and the other anonymous reviewer(s) for their contribution to the peer review of this work.
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Supplementary Notes 1–4, Supplementary Tables 1–7, Supplementary Figures 1–18, Supplementary References
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