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Refocusing multiple stressor research around the targets and scales of ecological impacts

Abstract

Ecological communities face a variety of environmental and anthropogenic stressors acting simultaneously. Stressor impacts can combine additively or can interact, causing synergistic or antagonistic effects. Our knowledge of when and how interactions arise is limited, as most models and experiments only consider the effect of a small number of non-interacting stressors at one or few scales of ecological organization. This is concerning because it could lead to significant underestimations or overestimations of threats to biodiversity. Furthermore, stressors have been largely classified by their source rather than by the mechanisms and ecological scales at which they act (the target). Here, we argue, first, that a more nuanced classification of stressors by target and ecological scale can generate valuable new insights and hypotheses about stressor interactions. Second, that the predictability of multiple stressor effects, and consistent patterns in their impacts, can be evaluated by examining the distribution of stressor effects across targets and ecological scales. Third, that a variety of existing mechanistic and statistical modelling tools can play an important role in our framework and advance multiple stressor research.

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Fig. 1: Conceptual diagram of the ecological scale-target-based classification of stressors to quantify the impact of multiple simultaneous stressors on ecological communities.
Fig. 2: A framework for assessing the consistency and predictability of stressors.
Fig. 3: Criteria that models must satisfy to simulate the impacts of multiple stressors.

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Acknowledgements

A.P.B., B.I.S., P.S.A.B. and E.D. acknowledge funding from the NERC (NE/S001395/1). A.P.B. acknowledges funding from the NERC (NE/T003502/1). B.I.S. was also supported by a Royal Commission for the Exhibition of 1851 Research Fellowship. T.J.W. acknowledges funding from the NERC and the Defra Marine Ecosystem Research Programme (NE/L003279/1). O.L.P, A.G. and F.P. acknowledge support of the University of Zurich Research Priority Programme Global Change and Biodiversity.

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B.I.S., P.S.A.B., J.L.B., T.C., E.D., A.G., C.A.G., U.J., F.P., O.L.P., T.P., T.J.W. and A.P.B. contributed to the ideas in this manuscript. B.I.S. wrote the first draft. B.I.S., P.S.A.B., J.L.B., T.C., E.D., A.G., C.A.G., U.J., F.P., O.L.P., T.P., T.J.W. and A.P.B. contributed to subsequent revisions.

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Correspondence to Benno I. Simmons.

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Simmons, B.I., Blyth, P.S.A., Blanchard, J.L. et al. Refocusing multiple stressor research around the targets and scales of ecological impacts. Nat Ecol Evol 5, 1478–1489 (2021). https://doi.org/10.1038/s41559-021-01547-4

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