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  • von Seth, JohannaStockholm University,Swedish Museum of Natural History,Stockholms universitet,Zoologiska institutionen,Centre for Palaeogenetics, Sweden; Swedish Museum of Natural History, Sweden (author)

Genomic trajectories of a near-extinction event in the Chatham Island black robin

  • Article/chapterEnglish2022

Publisher, publication year, extent ...

  • 2022-11-10
  • Springer Science and Business Media LLC,2022
  • printrdacarrier

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  • LIBRIS-ID:oai:DiVA.org:su-211679
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-211679URI
  • https://doi.org/10.1186/s12864-022-08963-1DOI
  • https://lup.lub.lu.se/record/62ce4b34-e1c7-4da9-aa7e-da5ba8b48247URI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Background: Understanding the micro-­evolutionary response of populations to demographic declines is a major goal in evolutionary and conservation biology. In small populations, genetic drift can lead to an accumulation of deleterious mutations, which will increase the risk of extinction. However, demographic recovery can still occur after extreme declines, suggesting that natural selection may purge deleterious mutations, even in extremely small populations. The Chatham Island black robin (Petroica traversi) is arguably the most inbred bird species in the world. It avoided imminent extinction in the early 1980s and after a remarkable recovery from a single pair, a second population was established and the two extant populations have evolved in complete isolation since then. Here, we analysed 52 modern and historical genomes to examine the genomic consequences of this extreme bottleneck and the subsequent translocation.Results: We found evidence for two-fold decline in heterozygosity and three- to four-fold increase in inbreeding in modern genomes. Moreover, there was partial support for temporal reduction in total load for detrimental variation. In contrast, compared to historical genomes, modern genomes showed a significantly higher realised load, reflecting the temporal increase in inbreeding. Furthermore, the translocation induced only small changes in the frequency of deleterious alleles, with the majority of detrimental variation being shared between the two populations.Conclusion: Our results highlight the dynamics of mutational load in a species that recovered from the brink of extinction, and show rather limited temporal changes in mutational load. We hypothesise that ancestral purging may have been facilitated by population fragmentation and isolation on several islands for thousands of generations and may have already reduced much of the highly deleterious load well before human arrival and introduction of pests to the archipelago. The majority of fixed deleterious variation was shared between the modern populations, but translocation of individuals with low mutational load could possibly mitigate further fixation of high-frequency deleterious variation.

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  • van der Valk, TomSwedish Museum of Natural History (author)
  • Lord, EdanaStockholm University,Swedish Museum of Natural History,Stockholms universitet,Zoologiska institutionen,Centre for Palaeogenetics, Sweden; Swedish Museum of Natural History, Sweden(Swepub:su)edlo5116 (author)
  • Sigeman, HannaLund University,Lunds universitet,MEMEG,Biologiska institutionen,Naturvetenskapliga fakulteten,Molekylär ekologi och evolution,Forskargrupper vid Lunds universitet,Department of Biology,Faculty of Science,Molecular Ecology and Evolution Lab,Lund University Research Groups,University of Oulu(Swepub:lu)ha4515si (author)
  • Olsen, Remi-AndréStockholms universitet,Institutionen för biokemi och biofysik,Science for Life Laboratory (SciLifeLab)(Swepub:su)rolse (author)
  • Knapp, MichaelUniversity of Otago (author)
  • Kardailsky, OlgaUniversity of Otago (author)
  • Robertson, FionaUniversity of Otago (author)
  • Hale, MarieCanterbury University (author)
  • Houston, DaveDepartment of Conservation, Waikato Conservancy (author)
  • Kennedy, EuanDepartment of Conservation, Waikato Conservancy (author)
  • Dalén, Love,1980-Stockholm University,Swedish Museum of Natural History,Stockholms universitet,Zoologiska institutionen,Centre for Palaeogenetics, Sweden; Swedish Museum of Natural History, Sweden(Swepub:lu)lo8440da (author)
  • Norén, Karin,1980-Stockholm University,Stockholms universitet,Zoologiska institutionen(Swepub:su)kano0121 (author)
  • Massaro, MelanieCharles Sturt University (author)
  • Robertson, Bruce C.University of Otago (author)
  • Dussex, NicolasStockholm University,Swedish Museum of Natural History,Stockholms universitet,Zoologiska institutionen,Centre for Palaeogenetics, Sweden; Swedish Museum of Natural History, Sweden(Swepub:su)nidu4424 (author)
  • Stockholms universitetZoologiska institutionen (creator_code:org_t)

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  • In:BMC Genomics: Springer Science and Business Media LLC231471-2164

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