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Pollinator-Promoting Interventions in European Urban Habitats-A Synthesis.

Gabriella Süle¹, András Báldi¹, David Kleijn²

¹Lendület Ecosystem Services Research Group, Institute of Ecology and Botany, HUN-REN Centre for Ecological Research, Vácrátót, Hungary.

Ecology Letters

|August 19, 2025

Summary

This summary is machine-generated.

Urban pollinator interventions generally benefit plants and pollinators, with flower sowing and road verge management showing strongest positive effects. Further research is needed for specific regions and less-studied pollinator groups.

Keywords:

city conservation data synthesis extensive mowing flower sowing green infrastructure meta‐analysis pollinator‐promoting interventions restoration measures urban areas

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Area of Science:

Ecology
Urban Ecology
Conservation Biology

Background:

Pollinators are crucial for ecosystems and human well-being.
Research on urban pollinator interventions is limited, hindering policy development.

Purpose of the Study:

To synthesize existing data on urban pollinator-promoting interventions.
To compare interventions with conventional management regarding vegetation, floral resources, and pollinators.

Main Methods:

A meta-analysis of 1051 sampling sites across 28 European datasets.
Inclusion of various interventions (abandonment, mowing, sowing) and habitats (parks, gardens, verges).
Analysis at both pooled and study levels.

Main Results:

Urban interventions generally benefited plants and pollinators, with taxon, habitat, and region-specific variations.
Flower sowing and road verge interventions showed particularly strong positive effects.
Bumblebees and butterflies showed the most significant benefits.

Conclusions:

Urban pollinator-promoting interventions are effective, especially those involving flower sowing in road verges.
Knowledge gaps exist for certain pollinator taxa, regions, and novel interventions.
Collaborative global studies are needed to create resilient urban green spaces.