Summary
A bioRxiv preprint compares two landscape-scale restoration scenarios in the French Alps, finding that the configuration with greater ecological impact relied on actions local stakeholders considered harder to implement. Both scenarios affected about 14.5% of the landscape, while their modeled effects extended across much larger areas for connectivity-dependent ecosystem services.
A bioRxiv preprint reports that landscape restoration can produce very different results depending on where interventions are placed—and that the locations with the greatest ecological potential may depend on actions that local stakeholders find difficult to implement.
The study examined the Grenoble region of the French Alps, comparing two restoration scenarios around protected areas. Both scenarios used the same set of interventions and physically modified about 14.5% of the landscape. They differed only in how those interventions were distributed: one was designed to maximise ecological continuity, while the other was co-designed with local stakeholders to reflect implementation feasibility.
Testing restoration around protected areas
The researchers used a gradient analysis of 12 ecosystem services across the interfaces between protected areas and surrounding landscapes. Ecosystem services are the benefits people obtain from functioning ecosystems; in this study, the analysis focused on how continuously those services were supplied across the landscape and where provision dropped sharply near protected-area boundaries.
The Technical scenario targeted areas with low continuity of ecosystem services around protected areas. The Participatory scenario was developed with local stakeholders, who helped determine where the same broad set of restoration actions should be located.
Both scenarios relied mainly on a forest-based adaptation strategy. Although direct interventions covered only about 14.5% of the landscape, the reported effects reached up to more than 60% of the territory for the services most dependent on ecological connectivity. This indicates that the consequences of restoring particular locations can extend beyond the land directly altered by an intervention.
Ecological performance versus implementation feasibility
The clearest difference between the scenarios appeared on agricultural land. The Technical scenario reduced abrupt declines in ecosystem-service provision at protected-area edges nearly twice as often as the Participatory scenario: it addressed 46% of the sharp declines considered, compared with 26% for the participatory design. At six locations, the technical configuration removed those declines entirely.
That ecological advantage came with a practical trade-off. More than 99% of the Technical scenario’s non-forest effort was assigned to agricultural diversification, including crop diversification and the addition of hedgerows. Stakeholders ranked this type of action as the hardest to implement. The Participatory scenario instead favoured actions such as river restoration, which encountered less resistance but failed to address several critical discontinuities in ecosystem-service supply.
The result is not simply a choice between restoring a larger or smaller area. In this regional analysis, placement was more important than expanding the total area treated. A scenario could affect the same share of the landscape while producing different levels of ecological continuity and facing different levels of social feasibility.
The authors propose using gradient-based diagnostics not as fixed instructions, but as a way to direct existing funding in agriculture, urban planning and forestry towards locations where interventions could have greater landscape-scale effects. Because the analysis was conducted in the Grenoble region, its percentages describe that particular social-ecological setting rather than a universal ratio for restoration projects elsewhere.
The work is a bioRxiv preprint based on modeled restoration scenarios. The supplied study summary does not report ecological outcomes from implementing either scenario in the landscape, so its main contribution is a framework for comparing ecological potential with stakeholder-supported feasibility before restoration decisions are made.