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Effects of habitat composition and landscape structure on worker foraging distances of five bumblebee species

Redhead, JW; Dreier, S; Bourke, AFG; Heard, MS; Jordan, WC; Sumner, S; Wang, J; (2016) Effects of habitat composition and landscape structure on worker foraging distances of five bumblebee species. Ecological Applications , 26 (3) pp. 726-739. 10.1890/15-0546. Green open access

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Abstract

Bumble bees (Bombus spp.) are important pollinators of both crops and wildflowers. Their contribution to this essential ecosystem service has been threatened over recent decades by changes in land use, which have led to declines in their populations. In order to design effective conservation measures, it is important to understand the effects of variation in landscape composition and structure on the foraging activities of worker bumble bees. This is because the viability of individual colonies is likely to be affected by the trade-off between the energetic costs of foraging over greater distances and the potential gains from access to additional resources. We used field surveys, molecular genetics, and fine resolution remote sensing to estimate the locations of wild bumble bee nests and to infer foraging distances across a 20-km2 agricultural landscape in southern England, UK. We investigated five species, including the rare B. ruderatus and ecologically similar but widespread B. hortorum. We compared worker foraging distances between species and examined how variation in landscape composition and structure affected foraging distances at the colony level. Mean worker foraging distances differed significantly between species. Bombus terrestris, B. lapidarius, and B. ruderatus exhibited significantly greater mean foraging distances (551, 536, and 501 m, respectively) than B. hortorum and B. pascuorum (336 and 272 m, respectively). There was wide variation in worker foraging distances between colonies of the same species, which was in turn strongly influenced by the amount and spatial configuration of available foraging habitats. Shorter foraging distances were found for colonies where the local landscape had high coverage and low fragmentation of seminatural vegetation, including managed agri-environmental field margins. The strength of relationships between different landscape variables and foraging distance varied between species, for example the strongest relationship for B. ruderatus being with floral cover of preferred forage plants. Our findings suggest that management of landscape composition and configuration has the potential to reduce foraging distances across a range of bumble bee species. There is thus potential for improvements in the design and implementation of landscape management options, such as agri-environment schemes, aimed at providing foraging habitat for bumble bees and enhancing crop pollination services.

Type: Article
Title: Effects of habitat composition and landscape structure on worker foraging distances of five bumblebee species
Open access status: An open access version is available from UCL Discovery
DOI: 10.1890/15-0546
Publisher version: http://dx.doi.org/10.1890/15-0546
Language: English
Additional information: This is the peer reviewed version of the following article: Redhead, JW; Dreier, S; Bourke, AFG; Heard, MS; Jordan, WC; Sumner, S; Wang, J; (2016) Effects of habitat composition and landscape structure on worker foraging distances of five bumblebee species. Ecological Applications , 26 (3) pp. 726-739, which has been published in final form at http://dx.doi.org/10.1890/15-0546. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: https://discovery.ucl.ac.uk/id/eprint/1538937
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