Ecosystem restoration strengthens pollination network resilience and function

Removal of invasive exotic shrubs from mountaintop communities increased the number of pollinators and positively altered pollinator behaviour, which enhanced native fruit production, indicating that the degradation of ecosystem functions is partly reversible. Restoring plant communities boosts pollination Human activities often have damaging effects on biodiversity and ecosystem functions, but whether the targeted manipulation of ecological communities can successfully mitigate and reverse these impacts is the subject of much debate. Here, Christopher Kaiser-Bunbury et al . assess the effect of one form of restoration—the removal of all alien plant species—on the structure and function of plant–pollinator networks in mountain-top communities in the Seychelles. Vegetation restoration leads to a marked increase in the number of pollinator species and pollinator visits to flowers. There is also an increase in the diversity of pollinator interactions and, importantly, the pollination of fruit crops and native plants. The findings suggest that the degradation of ecosystem functions, in this case pollination, is at least partly reversible. Land degradation results in declining biodiversity and the disruption of ecosystem functioning worldwide, particularly in the tropics 1 . Vegetation restoration is a common tool used to mitigate these impacts and increasingly aims to restore ecosystem functions rather than species diversity 2 . However, evidence from community experiments on the effect of restoration practices on ecosystem functions is scarce 3 . Pollination is an important ecosystem function and the global decline in pollinators attenuates the resistance of natural areas and agro-environments to disturbances 4 . Thus, the ability of pollination functions to resist or recover from disturbance (that is, the functional resilience) 5 , 6 may be critical for ensuring a successful restoration process 7 . Here we report the use of a community field experiment to investigate the effects of vegetation restoration, specifically the removal of exotic shrubs, on pollination. We analyse 64 plant–pollinator networks and the reproductive performance of the ten most abundant plant species across four restored and four unrestored, disturbed mountaintop communities. Ecosystem restoration resulted in a marked increase in pollinator species, visits to flowers and interaction diversity. Interactions in restored networks were more generalized than in unrestored networks, indicati