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Genomewide analysis of admixture and adaptation in the Africanized honeybee

Nelson, Ronald M. (author)
Uppsala universitet,Science for Life Laboratory, SciLifeLab,Institutionen för medicinsk biokemi och mikrobiologi
Wallberg, Andreas (author)
Uppsala universitet,Institutionen för medicinsk biokemi och mikrobiologi,Science for Life Laboratory, SciLifeLab
Paulino Simoes, Zila Luz (author)
Univ Sao Paulo, FFCLRP, Dept Biol, Ribeirao Preto, Brazil.;Univ Sao Paulo, FMRP, Dept Genet, Ribeirao Preto, Brazil.
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Lawson, Daniel J. (author)
Univ Bristol, Dept Math, Bristol, Avon, England.
Webster, Matthew Thomas (author)
Uppsala universitet,Institutionen för medicinsk biokemi och mikrobiologi,Science for Life Laboratory, SciLifeLab
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 (creator_code:org_t)
2017-04-24
2017
English.
In: Molecular Ecology. - : Wiley. - 0962-1083 .- 1365-294X. ; 26:14, s. 3603-3617
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Genetic exchange by hybridization or admixture can make an important contribution to evolution, and introgression of favourable alleles can facilitate adaptation to new environments. A small number of honeybees (Apis mellifera) with African ancestry were introduced to Brazil similar to 60 years ago, which dispersed and hybridized with existing managed populations of European origin, quickly spreading across much of the Americas in an example of a massive biological invasion. Here, we analyse whole-genome sequences of 32 Africanized honeybees sampled from throughout Brazil to study the effect of this process on genome diversity. By comparison with ancestral populations from Europe and Africa, we infer that these samples have 84% African ancestry, with the remainder from western European populations. However, this proportion varies across the genome and we identify signals of positive selection in regions with high European ancestry proportions. These observations are largely driven by one large gene-rich 1.4-Mbp segment on chromosome 11 where European haplotypes are present at a significantly elevated frequency and likely confer an adaptive advantage in the Africanized honeybee population. This region has previously been implicated in reproductive traits and foraging behaviour in worker bees. Finally, by analysing the distribution of ancestry tract lengths in the context of the known time of the admixture event, we are able to infer an average generation time of 2.0 years. Our analysis highlights the processes by which populations of mixed genetic ancestry form and adapt to new environments.

Subject headings

NATURVETENSKAP  -- Biologi -- Evolutionsbiologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences -- Evolutionary Biology (hsv//eng)
NATURVETENSKAP  -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
NATURVETENSKAP  -- Biologi -- Ekologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences -- Ecology (hsv//eng)

Keyword

adaptation
admixture
Africanized honeybee
biological invasion
introgression
natural selection

Publication and Content Type

ref (subject category)
art (subject category)

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