Establishment of wildflower fields in poor quality landscapes enhances micro-parasite prevalence in wild bumble bees

Piot, Niels; Meeus, Ivan; Kleijn, David; Scheper, Jeroen; Linders, Theo; Smagghe, Guy (2019). Establishment of wildflower fields in poor quality landscapes enhances micro-parasite prevalence in wild bumble bees. Oecologia, 189(1), pp. 149-158. Springer 10.1007/s00442-018-4296-y

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The current worldwide pollinator decline is caused by the interplay of different drivers. Several strategies have been undertaken to counteract or halt this decline, one of which is the implementation of wildflower fields. These supplementary flowers provide extra food resources and have proven their success in increasing pollinator biodiversity and abundance. Yet such landscape alterations could also alter the host--pathogen dynamics of pollinators, which could affect the populations. In this study, we investigated the influence of sown wildflower fields on the prevalence of micro-parasites and viruses in the wild bumble bee Bombus pascuorum, one of the most abundant bumble bee species in Europe and the Netherlands. We found that the effect of sown wildflower fields on micro-parasite prevalence is affected by the composition of the surrounding landscape and the size of the flower field. The prevalence of micro-parasites increases with increasing size of sown wildflower fields in landscapes with few semi-natural landscape elements. This effect was not observed in landscapes with a high amount of semi-natural landscape elements. We elaborate on two mechanisms which can support these findings: (1) "transmission hot spots" within the altered flower-networks, which could negatively impact hosts experiencing an increased exposure; (2) improved tolerance of the hosts, withstanding higher parasite populations.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Biodiversity

UniBE Contributor:

Linders, Theo Edmund Werner

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0029-8549

Publisher:

Springer

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

19 Nov 2018 15:42

Last Modified:

23 Oct 2019 03:54

Publisher DOI:

10.1007/s00442-018-4296-y

Related URLs:

Uncontrolled Keywords:

host–pathogen; bumble bee; conservation; parasites; flower mixes

BORIS DOI:

10.7892/boris.121137

URI:

https://boris.unibe.ch/id/eprint/121137

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