Prediction of unprecedented biological shifts in the global ocean

Abstract

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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Fig. 1: Long-term biological changes and ACSs for both the observed community and a simulated pseudo-community in the North Sea.
Fig. 2: Predicted and observed long-term community changes for 14 systems.
Fig. 3: Comparisons of observed and predicted community shifts for all ecoregions combined.
Fig. 4: Predicted long-term variation of ACSs in the global ocean.
Fig. 5: Predicted ACSs and climatic shifts during specific time periods between 1960–2015.

Data availability

The data that support the findings of this study are available from the corresponding author upon request.

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Acknowledgements

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.

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G.B. conceived the study. G.B., A.C., A.A., E.G., J.C. and S.C. compiled the data with input from all co-authors. G.B. analysed the data. G.B. wrote the initial draft or the paper. G.B., A.C., A.A., P.C.R., C.G., E.G., J.C., R.R.K., S.A.O., S.C. and M.E. discussed the results and contributed to writing the paper, with input from all co-authors.

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Correspondence to G. Beaugrand.

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Supplementary Notes 1–4, Supplementary Tables 1–7, Supplementary Figures 1–18, Supplementary References

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Beaugrand, G., Conversi, A., Atkinson, A. et al. Prediction of unprecedented biological shifts in the global ocean. Nat. Clim. Chang. 9, 237–243 (2019). https://doi.org/10.1038/s41558-019-0420-1

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