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Workers’ sons rescue genetic diversity at the sex locus in an invasive honey bee population


Gloag, Rosalyn S; Christie, Joshua R; Ding, Guiling; Stephens, Ruby E; Buchmann, Gabriele; Oldroyd, Benjamin P (2019). Workers’ sons rescue genetic diversity at the sex locus in an invasive honey bee population. Molecular Ecology, 28(7):1585-1592.

Abstract

The hallmark of eusociality is the division of labour between reproductive (queen) and non‐reproductive (worker) females. Yet in many eusocial insects, workers retain the ability to produce haploid male offspring from unfertilized eggs. The reproductive potential of workers has well‐documented consequences for the structure and function of insect colonies, but its implications at the population level are less often considered. We show that worker reproduction in honey bees can have an important role in maintaining genetic diversity at the sex locus in invasive populations. The honey bee sex locus is homozygous‐lethal and, all else being equal, a higher allele number in the population leads to higher mean brood survival. In an invasive population of the honey bee Apis cerana in Australia, workers contribute significantly to male production: 38% of male‐producing colonies are queenless, and these contribute one‐third of all males at mating congregations. Using a model, we show that such male production by queenless workers will increase the number of sex alleles retained in nascent invasive populations following founder events, relative to a scenario in which only queens reproduce. We conclude that by rescuing sex‐locus diversity that would otherwise be lost, workers’ sons help honey bee populations to minimize the negative effects of inbreeding after founder events and so contribute to their success as invaders.

Abstract

The hallmark of eusociality is the division of labour between reproductive (queen) and non‐reproductive (worker) females. Yet in many eusocial insects, workers retain the ability to produce haploid male offspring from unfertilized eggs. The reproductive potential of workers has well‐documented consequences for the structure and function of insect colonies, but its implications at the population level are less often considered. We show that worker reproduction in honey bees can have an important role in maintaining genetic diversity at the sex locus in invasive populations. The honey bee sex locus is homozygous‐lethal and, all else being equal, a higher allele number in the population leads to higher mean brood survival. In an invasive population of the honey bee Apis cerana in Australia, workers contribute significantly to male production: 38% of male‐producing colonies are queenless, and these contribute one‐third of all males at mating congregations. Using a model, we show that such male production by queenless workers will increase the number of sex alleles retained in nascent invasive populations following founder events, relative to a scenario in which only queens reproduce. We conclude that by rescuing sex‐locus diversity that would otherwise be lost, workers’ sons help honey bee populations to minimize the negative effects of inbreeding after founder events and so contribute to their success as invaders.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Uncontrolled Keywords:Genetics, Ecology, Evolution, Behavior and Systematics
Language:English
Date:1 April 2019
Deposited On:14 Mar 2019 16:46
Last Modified:01 May 2019 01:09
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:0962-1083
OA Status:Closed
Publisher DOI:https://doi.org/10.1111/mec.15031

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