Section: Ecology
Topic: Ecology, Evolution, Population biology

Positive fitness effects help explain the broad range of Wolbachia prevalences in natural populations

10.24072/pcjournal.202 - Peer Community Journal, Volume 2 (2022), article no. e76.

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The bacterial endosymbiont Wolbachia is best known for its ability to modify its host’s reproduction by inducing cytoplasmic incompatibility (CI) to facilitate its own spread. Classical models predict either near-fixation of costly Wolbachia once the symbiont has overcome a threshold frequency (invasion barrier), or Wolbachia extinction if the barrier is not overcome. However, natural populations do not all follow this pattern: Wolbachia can also be found at low frequencies (below one half) that appear stable over time. Wolbachia is known to have pleiotropic fitness effects (beyond CI) on its hosts. Existing models typically focus on the possibility that these are negative. Here we consider the possibility that the symbiont provides direct benefits to infected females (e.g. resistance to pathogens) in addition to CI. We discuss an underappreciated feature of Wolbachia dynamics: that CI with additional fitness benefits can produce low-frequency (< 1/2) stable equilibria. Additionally, without a direct positive fitness effect, any stable equilibrium close to one half will be sensitive to perturbations, which make such equilibria unlikely to sustain in nature. The results hold for both diplodiploid and different haplodiploid versions of CI. We suggest that insect populations showing low-frequency Wolbachia infection might host CI-inducing symbiotic strains providing additional (hidden or known) benefits to their hosts, especially when classical explanations (ongoing invasion, source-sink dynamics) have been ruled out.

Published online:
DOI: 10.24072/pcjournal.202
Type: Research article
Karisto, Petteri 1, 2; Duplouy, Anne 3; de Vries, Charlotte 1, 4; Kokko, Hanna 1, 5, 6

1 Department of Evolutionary Biology and Environmental Studies, University of Zurich – Zurich, Switzerland
2 Current address: Plant Health, Natural Resources Institute Finland – Jokioinen, Finland
3 Insect Symbiosis Ecology and Evolution, Organismal and Evolutionary Biology Research Program, University of Helsinki – Helsinki, Finland
4 Current address: Department of Biological and Environmental Science, University of Jyväskylä – Jyväskylä, Finland
5 Konrad Lorenz Institute of Ethology, University of Veterinary Medicine – Vienna, Austria
6 Faculty of Biological and Environmental Sciences, University of Helsinki – Helsinki, Finland
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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Karisto, Petteri; Duplouy, Anne; de Vries, Charlotte; Kokko, Hanna. Positive fitness effects help explain the broad range of Wolbachia prevalences in natural populations. Peer Community Journal, Volume 2 (2022), article  no. e76. doi : 10.24072/pcjournal.202. https://peercommunityjournal.org/articles/10.24072/pcjournal.202/

Peer reviewed and recommended by PCI : 10.24072/pci.ecology.100104

Conflict of interest of the recommender and peer reviewers:
The recommender in charge of the evaluation of the article and the reviewers declared that they have no conflict of interest (as defined in the code of conduct of PCI) with the authors or with the content of the article.

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