Along-shelf connectivity and circumpolar gene flow in Antarctic silverfish (Pleuragramma antarctica)
The Antarctic silverfish (Pleuragramma antarctica) is a critically important forage species with a circumpolar distribution and is unique among other notothenioid species for its wholly pelagic life cycle. Previous studies have provided mixed evidence of population structure over regional and circum...
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ftpubmed:oai:pubmedcentral.nih.gov:6294782 2023-05-15T13:52:35+02:00 Along-shelf connectivity and circumpolar gene flow in Antarctic silverfish (Pleuragramma antarctica) Caccavo, Jilda Alicia Papetti, Chiara Wetjen, Maj Knust, Rainer Ashford, Julian R. Zane, Lorenzo 2018-12-14 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6294782/ http://www.ncbi.nlm.nih.gov/pubmed/30552350 https://doi.org/10.1038/s41598-018-36030-x en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6294782/ http://www.ncbi.nlm.nih.gov/pubmed/30552350 http://dx.doi.org/10.1038/s41598-018-36030-x © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Article Text 2018 ftpubmed https://doi.org/10.1038/s41598-018-36030-x 2018-12-30T01:14:06Z The Antarctic silverfish (Pleuragramma antarctica) is a critically important forage species with a circumpolar distribution and is unique among other notothenioid species for its wholly pelagic life cycle. Previous studies have provided mixed evidence of population structure over regional and circumpolar scales. The aim of the present study was to test the recent population hypothesis for Antarctic silverfish, which emphasizes the interplay between life history and hydrography in shaping connectivity. A total of 1067 individuals were collected over 25 years from different locations on a circumpolar scale. Samples were genotyped at fifteen microsatellites to assess population differentiation and genetic structuring using clustering methods, F-statistics, and hierarchical analysis of variance. A lack of differentiation was found between locations connected by the Antarctic Slope Front Current (ASF), indicative of high levels of gene flow. However, gene flow was significantly reduced at the South Orkney Islands and the western Antarctic Peninsula where the ASF is absent. This pattern of gene flow emphasized the relevance of large-scale circulation as a mechanism for circumpolar connectivity. Chaotic genetic patchiness characterized population structure over time, with varying patterns of differentiation observed between years, accompanied by heterogeneous standard length distributions. The present study supports a more nuanced version of the genetic panmixia hypothesis that reflects physical-biological interactions over the life history. Text Antarc* Antarctic Antarctic Peninsula Antarctic silverfish Antarctica South Orkney Islands PubMed Central (PMC) Antarctic Antarctic Peninsula South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) The Antarctic Scientific Reports 8 1 |
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Article Caccavo, Jilda Alicia Papetti, Chiara Wetjen, Maj Knust, Rainer Ashford, Julian R. Zane, Lorenzo Along-shelf connectivity and circumpolar gene flow in Antarctic silverfish (Pleuragramma antarctica) |
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description |
The Antarctic silverfish (Pleuragramma antarctica) is a critically important forage species with a circumpolar distribution and is unique among other notothenioid species for its wholly pelagic life cycle. Previous studies have provided mixed evidence of population structure over regional and circumpolar scales. The aim of the present study was to test the recent population hypothesis for Antarctic silverfish, which emphasizes the interplay between life history and hydrography in shaping connectivity. A total of 1067 individuals were collected over 25 years from different locations on a circumpolar scale. Samples were genotyped at fifteen microsatellites to assess population differentiation and genetic structuring using clustering methods, F-statistics, and hierarchical analysis of variance. A lack of differentiation was found between locations connected by the Antarctic Slope Front Current (ASF), indicative of high levels of gene flow. However, gene flow was significantly reduced at the South Orkney Islands and the western Antarctic Peninsula where the ASF is absent. This pattern of gene flow emphasized the relevance of large-scale circulation as a mechanism for circumpolar connectivity. Chaotic genetic patchiness characterized population structure over time, with varying patterns of differentiation observed between years, accompanied by heterogeneous standard length distributions. The present study supports a more nuanced version of the genetic panmixia hypothesis that reflects physical-biological interactions over the life history. |
format |
Text |
author |
Caccavo, Jilda Alicia Papetti, Chiara Wetjen, Maj Knust, Rainer Ashford, Julian R. Zane, Lorenzo |
author_facet |
Caccavo, Jilda Alicia Papetti, Chiara Wetjen, Maj Knust, Rainer Ashford, Julian R. Zane, Lorenzo |
author_sort |
Caccavo, Jilda Alicia |
title |
Along-shelf connectivity and circumpolar gene flow in Antarctic silverfish (Pleuragramma antarctica) |
title_short |
Along-shelf connectivity and circumpolar gene flow in Antarctic silverfish (Pleuragramma antarctica) |
title_full |
Along-shelf connectivity and circumpolar gene flow in Antarctic silverfish (Pleuragramma antarctica) |
title_fullStr |
Along-shelf connectivity and circumpolar gene flow in Antarctic silverfish (Pleuragramma antarctica) |
title_full_unstemmed |
Along-shelf connectivity and circumpolar gene flow in Antarctic silverfish (Pleuragramma antarctica) |
title_sort |
along-shelf connectivity and circumpolar gene flow in antarctic silverfish (pleuragramma antarctica) |
publisher |
Nature Publishing Group UK |
publishDate |
2018 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6294782/ http://www.ncbi.nlm.nih.gov/pubmed/30552350 https://doi.org/10.1038/s41598-018-36030-x |
long_lat |
ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
Antarctic Antarctic Peninsula South Orkney Islands The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula South Orkney Islands The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic silverfish Antarctica South Orkney Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic silverfish Antarctica South Orkney Islands |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6294782/ http://www.ncbi.nlm.nih.gov/pubmed/30552350 http://dx.doi.org/10.1038/s41598-018-36030-x |
op_rights |
© The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41598-018-36030-x |
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Scientific Reports |
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8 |
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