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Changing bee and hoverfly pollinator assemblages along an urban-rural gradient.

Adam J Bates¹, Jon P Sadler, Alison J Fairbrass

¹Geography, Earth and Environmental Sciences, The University of Birmingham, Birmingham, West Midlands, United Kingdom. a.j.bates@bham.ac.uk

|August 23, 2011

Summary

Urbanization negatively impacts bee and hoverfly diversity and abundance, though local habitat quality can mitigate these effects. Rural areas generally support richer pollinator assemblages than urban and suburban sites.

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Area of Science:

Ecology
Urban Ecology
Conservation Biology

Background:

Global declines in bees and pollinators threaten ecosystem services.
Agricultural intensification is a known driver of pollinator loss.
The impact of increasing global urbanization on pollinator assemblages remains under-researched.

Purpose of the Study:

To assess the effects of urbanization on the diversity, abundance, and species composition of bee and hoverfly assemblages.
To compare pollinator assemblages across urban, suburban, and rural gradients.
To investigate the role of local habitat quality in urban pollinator support.

Main Methods:

Pollinators (bees and hoverflies) were sampled at 24 churchyard and cemetery sites across an urbanization gradient.
Local habitat variables (e.g., floral resources, shelter) and urbanization levels (e.g., built landscape percentage) were quantified.
Statistical analyses examined relationships between urbanization, habitat quality, and pollinator metrics.

Main Results:

Pollinator diversity and abundance were significantly lower in highly urbanized areas.
Assemblage composition shifted along the urbanization gradient, with more species negatively affected by urban land-use.
Positive associations were found between pollinator presence and local habitat quality, especially abundant flowering plants.

Conclusions:

Urban areas can support pollinator assemblages, but this is contingent on local habitat quality.
Urban and suburban sites exhibited lower pollinator diversity and abundance compared to rural sites.
Further research in diverse urban settings is needed to confirm the generalizability of these findings.