Gone with the currents: lack of genetic differentiation at the circum-continental scale in the Antarctic krill Euphausia superba
Abstract Background Southern Ocean fauna represent a significant amount of global biodiversity, whose origin may be linked to glacial cycles determining local extinction/eradication with ice advance, survival of refugee populations and post-glacial re-colonization. This pattern implies high potentia...
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ftdoajarticles:oai:doaj.org/article:ba72f6efc6404a708f16b878e6c8b7d7 2023-05-15T13:34:21+02:00 Gone with the currents: lack of genetic differentiation at the circum-continental scale in the Antarctic krill Euphausia superba Zane Lorenzo Mezzavilla Massimo Bucklin Ann Bortolotto Erica Patarnello Tomaso 2011-04-01T00:00:00Z https://doi.org/10.1186/1471-2156-12-32 https://doaj.org/article/ba72f6efc6404a708f16b878e6c8b7d7 EN eng BMC http://www.biomedcentral.com/1471-2156/12/32 https://doaj.org/toc/1471-2156 doi:10.1186/1471-2156-12-32 1471-2156 https://doaj.org/article/ba72f6efc6404a708f16b878e6c8b7d7 BMC Genetics, Vol 12, Iss 1, p 32 (2011) Genetics QH426-470 article 2011 ftdoajarticles https://doi.org/10.1186/1471-2156-12-32 2022-12-31T05:33:15Z Abstract Background Southern Ocean fauna represent a significant amount of global biodiversity, whose origin may be linked to glacial cycles determining local extinction/eradication with ice advance, survival of refugee populations and post-glacial re-colonization. This pattern implies high potential for differentiation in benthic shelf species with limited dispersal, yet consequences for pelagic organisms are less clear. The present study investigates levels of genetic variation and population structure of the Antarctic krill Euphausia superba using mitochondrial DNA and EST-linked microsatellite markers for an unprecedentedly comprehensive sampling of its populations over a circum-Antarctic range. Results MtDNA (ND1) sequences and EST-linked microsatellite markers indicated no clear sign of genetic structure among populations over large geographic scales, despite considerable power to detect differences inferred from forward-time simulations. Based on ND1, few instances of genetic heterogeneity, not significant after correction for multiple tests, were detected between geographic or temporal samples. Neutrality tests and mismatch distribution based on mtDNA sequences revealed strong evidence of past population expansion. Significant positive values of the parameter g (a measure of population growth) were obtained from microsatellite markers using a coalescent-based genealogical method and suggested a recent start (60 000 - 40 000 years ago) for the expansion. Conclusions The results provide evidence of lack of genetic heterogeneity of Antarctic krill at large geographic scales and unequivocal support for recent population expansion. Lack of genetic structuring likely reflects the tight link between krill and circum-Antarctic ocean currents and is consistent with the hypothesis that differentiation processes in Antarctic species are largely influenced by dispersal potential, whereas small-scale spatial and temporal differentiation might be due to local conditions leading to genetic patchiness. The signal of ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Ocean Euphausia superba Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean The Antarctic Antarctic Ocean BMC Genetics 12 1 32 |
institution |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Genetics QH426-470 |
spellingShingle |
Genetics QH426-470 Zane Lorenzo Mezzavilla Massimo Bucklin Ann Bortolotto Erica Patarnello Tomaso Gone with the currents: lack of genetic differentiation at the circum-continental scale in the Antarctic krill Euphausia superba |
topic_facet |
Genetics QH426-470 |
description |
Abstract Background Southern Ocean fauna represent a significant amount of global biodiversity, whose origin may be linked to glacial cycles determining local extinction/eradication with ice advance, survival of refugee populations and post-glacial re-colonization. This pattern implies high potential for differentiation in benthic shelf species with limited dispersal, yet consequences for pelagic organisms are less clear. The present study investigates levels of genetic variation and population structure of the Antarctic krill Euphausia superba using mitochondrial DNA and EST-linked microsatellite markers for an unprecedentedly comprehensive sampling of its populations over a circum-Antarctic range. Results MtDNA (ND1) sequences and EST-linked microsatellite markers indicated no clear sign of genetic structure among populations over large geographic scales, despite considerable power to detect differences inferred from forward-time simulations. Based on ND1, few instances of genetic heterogeneity, not significant after correction for multiple tests, were detected between geographic or temporal samples. Neutrality tests and mismatch distribution based on mtDNA sequences revealed strong evidence of past population expansion. Significant positive values of the parameter g (a measure of population growth) were obtained from microsatellite markers using a coalescent-based genealogical method and suggested a recent start (60 000 - 40 000 years ago) for the expansion. Conclusions The results provide evidence of lack of genetic heterogeneity of Antarctic krill at large geographic scales and unequivocal support for recent population expansion. Lack of genetic structuring likely reflects the tight link between krill and circum-Antarctic ocean currents and is consistent with the hypothesis that differentiation processes in Antarctic species are largely influenced by dispersal potential, whereas small-scale spatial and temporal differentiation might be due to local conditions leading to genetic patchiness. The signal of ... |
format |
Article in Journal/Newspaper |
author |
Zane Lorenzo Mezzavilla Massimo Bucklin Ann Bortolotto Erica Patarnello Tomaso |
author_facet |
Zane Lorenzo Mezzavilla Massimo Bucklin Ann Bortolotto Erica Patarnello Tomaso |
author_sort |
Zane Lorenzo |
title |
Gone with the currents: lack of genetic differentiation at the circum-continental scale in the Antarctic krill Euphausia superba |
title_short |
Gone with the currents: lack of genetic differentiation at the circum-continental scale in the Antarctic krill Euphausia superba |
title_full |
Gone with the currents: lack of genetic differentiation at the circum-continental scale in the Antarctic krill Euphausia superba |
title_fullStr |
Gone with the currents: lack of genetic differentiation at the circum-continental scale in the Antarctic krill Euphausia superba |
title_full_unstemmed |
Gone with the currents: lack of genetic differentiation at the circum-continental scale in the Antarctic krill Euphausia superba |
title_sort |
gone with the currents: lack of genetic differentiation at the circum-continental scale in the antarctic krill euphausia superba |
publisher |
BMC |
publishDate |
2011 |
url |
https://doi.org/10.1186/1471-2156-12-32 https://doaj.org/article/ba72f6efc6404a708f16b878e6c8b7d7 |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Ocean |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Ocean |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Ocean Euphausia superba Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Ocean Euphausia superba Southern Ocean |
op_source |
BMC Genetics, Vol 12, Iss 1, p 32 (2011) |
op_relation |
http://www.biomedcentral.com/1471-2156/12/32 https://doaj.org/toc/1471-2156 doi:10.1186/1471-2156-12-32 1471-2156 https://doaj.org/article/ba72f6efc6404a708f16b878e6c8b7d7 |
op_doi |
https://doi.org/10.1186/1471-2156-12-32 |
container_title |
BMC Genetics |
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12 |
container_issue |
1 |
container_start_page |
32 |
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1766051874164703232 |