Abstract
Context
In modern agricultural landscapes, fragmentation of partial habitats is a significant filter for multi-habitat users, reducing local taxonomic and functional diversity. There is compelling evidence that small species are more susceptible than large species. The impact of habitat fragmentation on intraspecific body-size distribution, however, is yet unexplored.
Objectives
We tested habitat fragmentation, a major driver of pollinator loss, for its impact on intraspecific body-size distributions of solitary wild-bee species. Subsequently, we tested individual body size for its impact on pollination services.
Methods
We sampled 1272 individuals of the four most common Andrena wild bee species in 22 newly established flowering fields (0.21–0.41 ha) in Hessen, Central Germany, over two consecutive years. Study sites were located in a ca. 80 ha landscape context of increasing habitat fragmentation. We analysed the pollen loads of the most abundant species.
Results
Body size within local populations of the two medium-sized bees increased with fragmentation, suggesting intraspecific selection for higher dispersal capacity. Pollen analysis carried out for the most common species revealed that larger individuals visited a significantly smaller plant spectrum. Habitat fragmentation may thus alter pollination services without necessarily affecting species richness or composition.
Conclusions
Systematic body-size variation at the population level thus explains the considerable variability between simple community measures and ecosystem functioning. Filtering processes at the individual level require increased understanding for targeting pollination services under current and future land-use change.
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Acknowledgments
DW was funded by Deutsche Bundesstiftung Umwelt (DBU). We thank M. Zerbe and K. Weiss of Amt für Ländlichen Raum Landkreis Marburg Biedenkopf for cooperation in site selection and farmers for access to their land. The Hessisches Ministerium für Energie, Landwirtschaft und Verbraucherschutz (HMUELV) and the Hessisches Landesamt für Umwelt und Geologie (HLUG) kindly provided digital land-use maps. We thank Stefanie Ettling for supporting pollen analysis and two anonymous reviewers for helpful comments.
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Warzecha, D., Diekötter, T., Wolters, V. et al. Intraspecific body size increases with habitat fragmentation in wild bee pollinators. Landscape Ecol 31, 1449–1455 (2016). https://doi.org/10.1007/s10980-016-0349-y
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DOI: https://doi.org/10.1007/s10980-016-0349-y