Invasive Pollinator Dynamics and Ecological Impact

Invasive pollinators are species introduced beyond their native ranges through deliberate or accidental human activities, and their establishment alters ecological interactions, biodiversity patterns and agricultural systems. Global transport of managed and wild bees has led to widespread establishment of non-native species that compete with indigenous pollinators for floral resources and nesting sites, introduce novel pathogens, and disrupt existing pollination networks. These changes can cascade through ecosystems by favouring generalist species, diminishing specialist plant reproduction and eroding community resilience. Climatic shifts and anthropogenic land-use changes further modulate invasion success, creating new suitable habitats while fragmenting or degrading native landscapes. Rapid range expansions of solitary and social bee invaders illustrate the interplay of ecological niche suitability, repeated introductions and human-assisted dispersal. The resulting community reassembly often involves enemy-release phenomena, disease spillover and genetic introgression, ultimately reshaping ecosystem services and conservation priorities. Effective management demands integrated surveillance, habitat restoration and risk modelling to anticipate future invasion hotspots and mitigate adverse impacts on native pollinators and plant communities.

Research from Nature Portfolio

Long-term monitoring of mason bees in the Mid-Atlantic United States has revealed dramatic declines in six native Osmia species concurrent with the establishment of two Asian congeners. Over a fifteen-year period, native abundance plummeted by up to 91%, while one exotic species increased eightfold and the other remained stable. Analyses of niche overlap and pathogen dynamics suggest that competition for nesting cavities and floral resources, combined with reduced natural enemies among exotics, underpin these shifts. This work highlights the need for targeted management of exotic pollinators and conservation of vulnerable native bee populations through habitat enhancement and biosecurity measures.

Invasive Pollinator Dynamics and Ecological Impact publication trend

The graph below shows the total number of articles in invasive pollinator dynamics and ecological impact across all publications each year (not limited to Nature Index journals).

Technical terms

Ecological niche modelling: A computational method to predict suitable habitats for species based on environmental variables and species occurrence data.

Enemy release: The phenomenon whereby introduced species experience reduced pressure from natural predators and pathogens compared with their native range.

Disease spillover: Transmission of pathogens from one host species to another, often facilitated by novel sympatries in invaded communities.

Niche overlap: The degree to which different species utilise the same resources or habitats, indicating potential for competition.

Pollination network: The web of interactions between flowering plants and their pollinators, whose structure influences ecosystem function and resilience.

References

1. Contrasting effects of climate and anthropogenic change on future invasion risk of a solitary bee Amegilla pulchra. Journal of Environmental Management (2025).
2. Positive and Negative Impacts of Non-Native Bee Species around the World. Insects (2016).
3. Decline of six native mason bee species following the arrival of an exotic congener. Scientific Reports (2020).
4. Evidence for multiple introductions of an invasive wild bee species currently under rapid range expansion in Europe. BMC Ecology and Evolution (2021).