Restoration science does not need redefinition

To the Editor — In a recent Correspondence to Nature Ecology & Evolution, Higgs et al.1 call for an open and flexible approach to ecological restoration, arguing that the current focus of the international standards published by the Society for Ecological Restoration (SER)2 may contribute to a narrowing of the scope of restoration that is detrimental in times of change. Several of the authors of that Correspondence, together with others, recently detailed their proposal for a revamping of conservation and restoration principles, definitions and standards3.

We beg to differ. We agree that modifications and improvements to the SER standards document are necessary; in fact, a concerted effort is now underway to produce an improved second edition. However, the problems are not in the area of definitions and principles. The currently accepted definitions of ecological restoration and ecological rehabilitation, as presented in the SER primer4, are robust: “Restoration seeks to re-establish the pre-existing biotic integrity, in terms of species composition and community structure, while rehabilitation aims to reinstate ecosystem functionality with a focus on provision of goods and services rather than restoration”2. Both of these activities can be planned and executed simultaneously, as advocated by the United Nations Convention to Combat Desertification document5 cited by Higgs et al. Indeed, on landscape and larger scales, several ‘restorative’ activities can be undertaken conjointly6,7,8,9.

By contrast, creating or repairing human-made systems designed to meet short-term human needs and desires belongs to the realm of ecological engineering or urban/landscape design, not ecological restoration2,4,8. Ecological engineering, urban and landscape design, and ecological restoration and rehabilitation are all valuable, and can be complementary9; but to be effective on large spatial scales, we need to distinguish clearly among these activities. Relaxing the rigour in the existing definition of ecological restoration, and that of ecological rehabilitation, will only sow more confusion precisely at a time when the ‘stakes’ are rising, to borrow a phrase used by Higgs et al. Any plea to change the basic definition of restoration is unhelpful to policymakers.


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Correspondence to James C. Aronson.

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Aronson, J.C., Simberloff, D., Ricciardi, A. et al. Restoration science does not need redefinition. Nat Ecol Evol 2, 916 (2018).

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