Microevolution and mega-icebergs in the Antarctic.
Microevolution is regarded as changes in the frequencies of genes in populations over time. Ancient DNA technology now provides an opportunity to demonstrate evolution over a geological time frame and to possibly identify the causal factors in any such evolutionary event. Using nine nuclear microsat...
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ftpubmed:16275908 2024-05-12T07:56:38+00:00 Microevolution and mega-icebergs in the Antarctic. Shepherd, L D Millar, C D Ballard, G Ainley, D G Wilson, P R Haynes, G D Baroni, C Lambert, D M 2005 Nov 15 https://doi.org/10.1073/pnas.0502281102 https://pubmed.ncbi.nlm.nih.gov/16275908 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1283793/ eng eng Atypon https://doi.org/10.1073/pnas.0502281102 https://pubmed.ncbi.nlm.nih.gov/16275908 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1283793/ Proc Natl Acad Sci U S A ISSN:0027-8424 Volume:102 Issue:46 Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2005 ftpubmed https://doi.org/10.1073/pnas.0502281102 2024-04-12T16:03:00Z Microevolution is regarded as changes in the frequencies of genes in populations over time. Ancient DNA technology now provides an opportunity to demonstrate evolution over a geological time frame and to possibly identify the causal factors in any such evolutionary event. Using nine nuclear microsatellite DNA loci, we genotyped an ancient population of Adélie penguins (Pygoscelis adeliae) aged approximately 6,000 years B.P. Subfossil bones from this population were excavated by using an accurate stratigraphic method that allowed the identification of individuals even within the same layer. We compared the allele frequencies in the ancient population with those recorded from the modern population at the same site in Antarctica. We report significant changes in the frequencies of alleles between these two time points, hence demonstrating microevolutionary change. This study demonstrates a nuclear gene-frequency change over such a geological time frame. We discuss the possible causes of such a change, including the role of mutation, genetic drift, and the effects of gene mixing among different penguin populations. The latter is likely to be precipitated by mega-icebergs that act to promote migration among penguin colonies that typically show strong natal return. Article in Journal/Newspaper Antarc* Antarctic Antarctica Iceberg* Pygoscelis adeliae PubMed Central (PMC) Antarctic The Antarctic Proceedings of the National Academy of Sciences 102 46 16717 16722 |
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Open Polar |
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PubMed Central (PMC) |
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ftpubmed |
language |
English |
description |
Microevolution is regarded as changes in the frequencies of genes in populations over time. Ancient DNA technology now provides an opportunity to demonstrate evolution over a geological time frame and to possibly identify the causal factors in any such evolutionary event. Using nine nuclear microsatellite DNA loci, we genotyped an ancient population of Adélie penguins (Pygoscelis adeliae) aged approximately 6,000 years B.P. Subfossil bones from this population were excavated by using an accurate stratigraphic method that allowed the identification of individuals even within the same layer. We compared the allele frequencies in the ancient population with those recorded from the modern population at the same site in Antarctica. We report significant changes in the frequencies of alleles between these two time points, hence demonstrating microevolutionary change. This study demonstrates a nuclear gene-frequency change over such a geological time frame. We discuss the possible causes of such a change, including the role of mutation, genetic drift, and the effects of gene mixing among different penguin populations. The latter is likely to be precipitated by mega-icebergs that act to promote migration among penguin colonies that typically show strong natal return. |
format |
Article in Journal/Newspaper |
author |
Shepherd, L D Millar, C D Ballard, G Ainley, D G Wilson, P R Haynes, G D Baroni, C Lambert, D M |
spellingShingle |
Shepherd, L D Millar, C D Ballard, G Ainley, D G Wilson, P R Haynes, G D Baroni, C Lambert, D M Microevolution and mega-icebergs in the Antarctic. |
author_facet |
Shepherd, L D Millar, C D Ballard, G Ainley, D G Wilson, P R Haynes, G D Baroni, C Lambert, D M |
author_sort |
Shepherd, L D |
title |
Microevolution and mega-icebergs in the Antarctic. |
title_short |
Microevolution and mega-icebergs in the Antarctic. |
title_full |
Microevolution and mega-icebergs in the Antarctic. |
title_fullStr |
Microevolution and mega-icebergs in the Antarctic. |
title_full_unstemmed |
Microevolution and mega-icebergs in the Antarctic. |
title_sort |
microevolution and mega-icebergs in the antarctic. |
publisher |
Atypon |
publishDate |
2005 |
url |
https://doi.org/10.1073/pnas.0502281102 https://pubmed.ncbi.nlm.nih.gov/16275908 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1283793/ |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Iceberg* Pygoscelis adeliae |
genre_facet |
Antarc* Antarctic Antarctica Iceberg* Pygoscelis adeliae |
op_source |
Proc Natl Acad Sci U S A ISSN:0027-8424 Volume:102 Issue:46 |
op_relation |
https://doi.org/10.1073/pnas.0502281102 https://pubmed.ncbi.nlm.nih.gov/16275908 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1283793/ |
op_doi |
https://doi.org/10.1073/pnas.0502281102 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
102 |
container_issue |
46 |
container_start_page |
16717 |
op_container_end_page |
16722 |
_version_ |
1798836806639157248 |