Demographic history and population structure of the Antarctic silverfish Pleuragramma antarcticum
Abstract The Antarctic silverfish Pleuragramma antarcticum (Nototheniidae) is the most abundant pelagic fish inhabiting Antarctic waters. In this study we investigated, through partial sequencing of the D‐loop mitochondrial region, samples collected at four different locations in the Southern Ocean,...
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crwiley:10.1111/j.1365-294x.2006.03105.x 2024-06-02T07:58:06+00:00 Demographic history and population structure of the Antarctic silverfish Pleuragramma antarcticum ZANE, L. MARCATO, S. BARGELLONI, L. BORTOLOTTO, E. PAPETTI, C. SIMONATO, M. VAROTTO, V. PATARNELLO, T. 2006 http://dx.doi.org/10.1111/j.1365-294x.2006.03105.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-294X.2006.03105.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-294X.2006.03105.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Molecular Ecology volume 15, issue 14, page 4499-4511 ISSN 0962-1083 1365-294X journal-article 2006 crwiley https://doi.org/10.1111/j.1365-294x.2006.03105.x 2024-05-03T10:41:13Z Abstract The Antarctic silverfish Pleuragramma antarcticum (Nototheniidae) is the most abundant pelagic fish inhabiting Antarctic waters. In this study we investigated, through partial sequencing of the D‐loop mitochondrial region, samples collected at four different locations in the Southern Ocean, three in the Atlantic and one in the Pacific sector. Sampling was replicated in two different years at two locations. Sequence analysis showed a remarkably high polymorphism, with 110 haplotypes over the 256 investigated specimens, and about 80% of haplotypes occurring only once. Neutrality tests indicated that all samples were not at mutation–drift equilibrium, and suggested a past population expansion. This result was supported by the presence of a star‐like topology in the D‐loop gene tree, and by results of mismatch distribution. The start of the expansion was dated, using a specifically calibrated clock, between 111 and 126 thousand years ago. This value corresponds to the start of the cooling period that led to the last glaciation peak, and is in close agreement with a recently suggested range expansion for pelagic Antarctic ecosystems. Analysis of molecular variation indicated a small, though highly significant, value of differentiation between samples. This result, together with the lack of association between clades and geographical locations, indicates a weak population structure for the species. Article in Journal/Newspaper Antarc* Antarctic Antarctic silverfish Southern Ocean Wiley Online Library Antarctic Pacific Southern Ocean The Antarctic Molecular Ecology 15 14 4499 4511 |
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Wiley Online Library |
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language |
English |
description |
Abstract The Antarctic silverfish Pleuragramma antarcticum (Nototheniidae) is the most abundant pelagic fish inhabiting Antarctic waters. In this study we investigated, through partial sequencing of the D‐loop mitochondrial region, samples collected at four different locations in the Southern Ocean, three in the Atlantic and one in the Pacific sector. Sampling was replicated in two different years at two locations. Sequence analysis showed a remarkably high polymorphism, with 110 haplotypes over the 256 investigated specimens, and about 80% of haplotypes occurring only once. Neutrality tests indicated that all samples were not at mutation–drift equilibrium, and suggested a past population expansion. This result was supported by the presence of a star‐like topology in the D‐loop gene tree, and by results of mismatch distribution. The start of the expansion was dated, using a specifically calibrated clock, between 111 and 126 thousand years ago. This value corresponds to the start of the cooling period that led to the last glaciation peak, and is in close agreement with a recently suggested range expansion for pelagic Antarctic ecosystems. Analysis of molecular variation indicated a small, though highly significant, value of differentiation between samples. This result, together with the lack of association between clades and geographical locations, indicates a weak population structure for the species. |
format |
Article in Journal/Newspaper |
author |
ZANE, L. MARCATO, S. BARGELLONI, L. BORTOLOTTO, E. PAPETTI, C. SIMONATO, M. VAROTTO, V. PATARNELLO, T. |
spellingShingle |
ZANE, L. MARCATO, S. BARGELLONI, L. BORTOLOTTO, E. PAPETTI, C. SIMONATO, M. VAROTTO, V. PATARNELLO, T. Demographic history and population structure of the Antarctic silverfish Pleuragramma antarcticum |
author_facet |
ZANE, L. MARCATO, S. BARGELLONI, L. BORTOLOTTO, E. PAPETTI, C. SIMONATO, M. VAROTTO, V. PATARNELLO, T. |
author_sort |
ZANE, L. |
title |
Demographic history and population structure of the Antarctic silverfish Pleuragramma antarcticum |
title_short |
Demographic history and population structure of the Antarctic silverfish Pleuragramma antarcticum |
title_full |
Demographic history and population structure of the Antarctic silverfish Pleuragramma antarcticum |
title_fullStr |
Demographic history and population structure of the Antarctic silverfish Pleuragramma antarcticum |
title_full_unstemmed |
Demographic history and population structure of the Antarctic silverfish Pleuragramma antarcticum |
title_sort |
demographic history and population structure of the antarctic silverfish pleuragramma antarcticum |
publisher |
Wiley |
publishDate |
2006 |
url |
http://dx.doi.org/10.1111/j.1365-294x.2006.03105.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-294X.2006.03105.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-294X.2006.03105.x |
geographic |
Antarctic Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic silverfish Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic silverfish Southern Ocean |
op_source |
Molecular Ecology volume 15, issue 14, page 4499-4511 ISSN 0962-1083 1365-294X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-294x.2006.03105.x |
container_title |
Molecular Ecology |
container_volume |
15 |
container_issue |
14 |
container_start_page |
4499 |
op_container_end_page |
4511 |
_version_ |
1800741366360178688 |