Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1098/rspb.2011.0268
Titel (primär) Expansion of mass-flowering crops leads to transient pollinator dilution and reduced wild plant pollination
Autor Holzschuh, A.; Dormann, C.F.; Tscharntke, T.; Steffan-Dewenter, I.
Quelle Proceedings of the Royal Society B-Biological Sciences
Erscheinungsjahr 2011
Department CLE
Band/Volume 278
Heft 1723
Seite von 3444
Seite bis 3451
Sprache englisch
Keywords canola; competition; facilitation; oilseed rape; pollination; spill-over

Agricultural land use results in direct biodiversity decline through loss of natural habitat, but may also cause indirect cross-habitat effects on conservation areas. We conducted three landscape-scale field studies on 67 sites to test the hypothesis that mass flowering of oilseed rape (Brassica napus) results in a transient dilution of bees in crop fields, and in increased competition between crop plants and grassland plants for pollinators. Abundances of bumble-bees, which are the main pollinators of the grassland plant Primula veris, but also pollinate oilseed rape (OSR), decreased with increasing amount of OSR. This landscape-scale dilution affected bumble-bee abundances strongly in OSR fields and marginally in grasslands, where bumble-bee abundances were generally low at the time of Primula flowering. Seed set of Primula veris, which flowers during OSR bloom, was reduced by 20 per cent when the amount of OSR within 1 km radius increased from 0 to 15 per cent. Hence, the current expansion of bee-attractive biofuel crops results in transient dilution of crop pollinators, which means an increased competition for pollinators between crops and wild plants. In conclusion, mass-flowering crops potentially threaten fitness of concurrently flowering wild plants in conservation areas, despite the fact that, in the long run, mass-flowering crops can enhance abundances of generalist pollinators and their pollination service.
dauerhafte UFZ-Verlinkung
Holzschuh, A., Dormann, C.F., Tscharntke, T., Steffan-Dewenter, I. (2011):
Expansion of mass-flowering crops leads to transient pollinator dilution and reduced wild plant pollination
Proc. R. Soc. B-Biol. Sci. 278 (1723), 3444 - 3451 10.1098/rspb.2011.0268