No severe genetic bottleneck in a rapidly range-expanding bumblebee pollinator

Brock, Ryan E., Crowther, Liam P., Wright, David J., Richardson, David S., Carvell, Claire, Taylor, Martin I. and Bourke, Andrew F. G. (2021) No severe genetic bottleneck in a rapidly range-expanding bumblebee pollinator. Proceedings of the Royal Society B, 288 (1944). ISSN 0962-8452

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Abstract

Genetic bottlenecks can limit the success of populations colonizing new ranges. However, successful colonizations can occur despite bottlenecks, a phenomenon known as the genetic paradox of invasion. Eusocial Hymenoptera such as bumblebees (Bombus spp.) should be particularly vulnerable to genetic bottlenecks, since homozygosity at the sex-determining locus leads to costly diploid male production (DMP). The Tree Bumblebee (Bombus hypnorum) has rapidly colonized the UK since 2001 and has been highlighted as exemplifying the genetic paradox of invasion. Using microsatellite genotyping, combined with the first genetic estimates of DMP in UK B. hypnorum, we tested two alternative genetic hypotheses ('bottleneck' and 'gene flow' hypotheses) for B. hypnorum's colonization of the UK. We found that the UK population has not undergone a recent severe genetic bottleneck and exhibits levels of genetic diversity falling between those of widespread and range-restricted Bombus species. Diploid males occurred in 15.4% of reared colonies, leading to an estimate of 21.5 alleles at the sex-determining locus. Overall, the findings show that this population is not bottlenecked, instead suggesting that it is experiencing continued gene flow from the continental European source population with only moderate loss of genetic diversity, and does not exemplify the genetic paradox of invasion.

Item Type: Article
Uncontrolled Keywords: bumblebee,colonization,diploid male production,genetic paradox of invasion,invasive species,population genetics,biochemistry, genetics and molecular biology(all),immunology and microbiology(all),environmental science(all),agricultural and biological sciences(all) ,/dk/atira/pure/subjectarea/asjc/1300
Faculty \ School: Faculty of Science > School of Biological Sciences
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Depositing User: LivePure Connector
Date Deposited: 20 Jan 2021 00:56
Last Modified: 24 Jul 2021 00:06
URI: https://ueaeprints.uea.ac.uk/id/eprint/78222
DOI: 10.1098/rspb.2020.2639

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