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Comparative Populat...
Comparative Population Transcriptomics Provide New Insight into the Evolutionary History and Adaptive Potential of World Ocean Krill
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- Choquet, Marvin (author)
- Uppsala universitet,Institutionen för medicinsk biokemi och mikrobiologi,Univ Oslo, Nat Hist Museum, Oslo, Norway.
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- Lenner, Felix (author)
- Uppsala universitet,Institutionen för medicinsk biokemi och mikrobiologi,Institutionen för immunologi, genetik och patologi
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- Cocco, Arianna (author)
- Uppsala universitet,Institutionen för medicinsk biokemi och mikrobiologi
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- Toullec, Gaelle (author)
- Ecole Polytech Federale Lausanne EPFL, Sch Architecture Civil & Environm Engn, Lab Biol Geochem, Lausanne, Switzerland.
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- Corre, Erwan (author)
- Sorbonne Univ, Stn Biol Roscoff, CNRS, FR 2424,ABiMS Platform, Roscoff, France.
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- Toullec, Jean-Yves (author)
- Sorbonne Univ, UMR 7144 AD2M, Stn Biol Roscoff, CNRS, Roscoff, France.
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- Wallberg, Andreas (author)
- Uppsala universitet,Institutionen för medicinsk biokemi och mikrobiologi
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(creator_code:org_t)
- Oxford University Press, 2023
- 2023
- English.
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In: Molecular biology and evolution. - : Oxford University Press. - 0737-4038 .- 1537-1719. ; 40:11
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Abstract
Subject headings
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- Genetic variation is instrumental for adaptation to changing environments but it is unclear how it is structured and contributes to adaptation in pelagic species lacking clear barriers to gene flow. Here, we applied comparative genomics to extensive transcriptome datasets from 20 krill species collected across the Atlantic, Indian, Pacific, and Southern Oceans. We compared genetic variation both within and between species to elucidate their evolutionary history and genomic bases of adaptation. We resolved phylogenetic interrelationships and uncovered genomic evidence to elevate the cryptic Euphausia similis var. armata into species. Levels of genetic variation and rates of adaptive protein evolution vary widely. Species endemic to the cold Southern Ocean, such as the Antarctic krill Euphausia superba, showed less genetic variation and lower evolutionary rates than other species. This could suggest a low adaptive potential to rapid climate change. We uncovered hundreds of candidate genes with signatures of adaptive evolution among Antarctic Euphausia but did not observe strong evidence of adaptive convergence with the predominantly Arctic Thysanoessa. We instead identified candidates for cold-adaptation that have also been detected in Antarctic fish, including genes that govern thermal reception such as TrpA1. Our results suggest parallel genetic responses to similar selection pressures across Antarctic taxa and provide new insights into the adaptive potential of important zooplankton already affected by climate change.
Subject headings
- NATURVETENSKAP -- Biologi -- Evolutionsbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Evolutionary Biology (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- NATURVETENSKAP -- Biologi -- Genetik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Genetics (hsv//eng)
- NATURVETENSKAP -- Biologi -- Zoologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Zoology (hsv//eng)
Keyword
- krill
- climate change
- population genomics
- comparative genomics
- genetic adaptation
Publication and Content Type
- ref (subject category)
- art (subject category)
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