Abstract
Modifications of landscape structure and composition can decrease the availability of floral resources, resulting in the decline of many pollinator species, including bumblebees. These declines may have significant ecological consequences, because bumblebees pollinate a large range of plant species. Our study was carried out in heathlands, open semi-natural habitats that have decreased considerably due to human activities. We analysed how floral resources affect bumblebee communities throughout the colony lifetime at three scales: plot scale, heathland patch scale, and landscape scale. Floral density at the plot scale and spruce plantations at the landscape scale influenced bumblebee communities. The abundance of bumblebees on ericaceous species was higher when the landscape included a substantial proportion of unsuitable foraging habitat (i.e., spruce plantations). Both life history traits and colony life cycle stage influenced bumblebee responses to the availability of floral resources. Bumblebees were more affected by floral resources during the colony development phase than during the nest-foundation or mating phases. Moreover, bumblebees of species that form large colonies needed larger quantities of favourable foraging habitat, compared with small-colony bees, and their proportion decreased in habitats dominated by spruce plantations. In conclusion, the conservation of plant–bumblebee interactions will require management at a larger spatial scale than the restricted protected habitats. Moreover, at the landscape scale, both quantity of favourable foraging patches and their ecological continuity are important to conserve both small- and large- colony species.
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Acknowledgements
We would like to thank the “Département de la Nature et des Forêts” for the permission to study in nature reserves and for the derogation concerning the sampling of plant and insect individuals. Thank to Kristin Sherrard and Jennifer Mach for language improvement and the two anonymous reviewers for their valuable comments on the first version of the manuscript. The study was conducted in accordance with current Belgian laws. Funding was provided by FSR Grant (“Fonds spéciaux de recherche”, Université catholique de Louvain) and FNRS («Fonds de la Recherche Scientifique», Web Impact Project, FRFC 2.4613.12). This research constitutes a part of L.M. Ph.D. thesis as well as the master theses for E.L. and R.B.
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Moquet, L., Bacchetta, R., Laurent, E. et al. Spatial and temporal variations in floral resource availability affect bumblebee communities in heathlands. Biodivers Conserv 26, 687–702 (2017). https://doi.org/10.1007/s10531-016-1266-8
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DOI: https://doi.org/10.1007/s10531-016-1266-8