Invasion Note

Biological Invasions

, Volume 15, Issue 3, pp 489-494

Alien parasite hitchhikes to Patagonia on invasive bumblebee

  • Marina P. ArbetmanAffiliated withUniversidad Nacional de Río NegroLaboratorio Ecotono, Centro Regional Universitario Bariloche, Universidad Nacional del Comahue—INIBIOMA (Conicet) Email author 
  • , Ivan MeeusAffiliated withLaboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University
  • , Carolina L. MoralesAffiliated withLaboratorio Ecotono, Centro Regional Universitario Bariloche, Universidad Nacional del Comahue—INIBIOMA (Conicet)
  • , Marcelo A. AizenAffiliated withLaboratorio Ecotono, Centro Regional Universitario Bariloche, Universidad Nacional del Comahue—INIBIOMA (Conicet)
  • , Guy SmaggheAffiliated withLaboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University

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Abstract

The worldwide trade in bumblebees can lead to the spread of diseases, which in turn has been claimed as a factor in bumblebee decline. Populations of the introduced Bombus terrestris, which invaded NW Patagonia, Argentina, in 2006, harbor the highly pathogenic protozoan Apicystis bombi. We asked whether A. bombi had been co-introduced with B. terrestris, and if so, whether spillover occurred to the two resident bumblebee species in the region: the introduced European Bombus ruderatus and the native Bombus dahlbomii. We searched for A. bombi by means of PCR in samples of B. ruderatus and B. dahlbomii collected before and after the invasion of B. terrestris and in samples of the latter. We found no A. bombi in samples of B. ruderatus and B. dahlbomii collected before B. terrestris invasion, whereas post invasion, A. bombi was present in all 3 species. The identity of the parasite was established by sequencing the 18S region, which was identical for the three bumblebee species and also matched the European sequence, confirming it to be A. bombi. This is the first report of A. bombi in B. ruderatus and B. dahlbomii. Moreover, our results suggest that Patagonia had been free of A. bombi until this parasite was co-introduced with B. terrestris, and spilled over in situ to these two previously resident species. Finally, our findings provide indirect circumstantial evidence of a potential link between the population collapse and geographic retraction of B. dahlbomii and the introduction of this novel parasite.

Keywords

Apicystis bombi Bombus dahlbomii Bombus ruderatus Mattesia bombi Bumblebee parasites Bombus terrestris