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Research article - Peer-reviewed, 2021

Adaptive population structure shifts in invasive parasitic mites, Varroa destructor

Moro, Arrigo; Blacquiere, Tjeerd; Dahle, Bjorn; Dietemann, Vincent; Le Conte, Yves; Locke, Barbara; Neumann, Peter; Beaurepaire, Alexis

Abstract

Comparative studies of genetic diversity and population structure can shed light on the ecological and evolutionary factors governing host-parasite interactions. Even though invasive parasites are considered of major biological importance, little is known about their adaptative potential when infesting the new hosts. Here, the genetic diversification of Varroa destructor, a novel parasite of Apis mellifera originating from Asia, was investigated using population genetics to determine how the genetic structure of the parasite changed in distinct European populations of its new host. To do so, mites infesting two categories of hosts in four European regions were compared: (a) adapted hosts surviving through means of natural selection, thereby expected to impose strong selective pressure on the mites, and (b) treated host populations, surviving mite infestations because acaricides are applied, therefore characterized by a relaxed selection imposed by the host on the mites. Significant genetic divergence was found across regions, partially reflecting the invasion pattern of V. destructor throughout Europe and indicating local adaptation of the mite to the host populations. Additionally, varying degrees of genotypic changes were found between mites from adapted and treated colonies. Altogether, these results indicate that V. destructor managed to overcome the genetic bottlenecks following its introduction in Europe and that host-mediated selection fostered changes in the genetic structure of this mite at diverse geographic scales. These findings highlight the potential of parasites to adapt to their local host populations and confirm that adaptations developed within coevolutionary dynamics are a major determinant of population genetic changes.

Keywords

coevolution; genetic diversity; host–parasite interactions; invasive species; population genetics; population structure

Published in

Ecology and Evolution
2021, volume: 11, number: 11, pages: 5937-5949
Publisher: WILEY

Authors' information

Moro, Arrigo
University of Bern
Blacquiere, Tjeerd
Wageningen University and Research
Dahle, Bjorn
Norwegian University of Life Sciences
Dietemann, Vincent
University of Lausanne
Le Conte, Yves
INRAE
Locke, Barbara (Locke Grandér, Barbara)
Swedish University of Agricultural Sciences, Department of Ecology
Neumann, Peter
University of Bern
Beaurepaire, Alexis
University of Bern

UKÄ Subject classification

Ecology

Publication Identifiers

DOI: https://doi.org/10.1002/ece3.7272

URI (permanent link to this page)

https://res.slu.se/id/publ/112027