Genomic evidence of survival near ice sheet margins for some, but not all, North American trees
Temperate species experienced dramatic range reductions during the Last Glacial Maximum, yet refugial populations from which modern populations are descended have never been precisely located. Climate-based models identify only broad areas of potential habitat, traditional phylogeographic studies pr...
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ftpubmed:oai:pubmedcentral.nih.gov:6486725 2023-05-15T16:40:33+02:00 Genomic evidence of survival near ice sheet margins for some, but not all, North American trees Bemmels, Jordan B. Knowles, L. Lacey Dick, Christopher W. 2019-04-23 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6486725/ http://www.ncbi.nlm.nih.gov/pubmed/30962371 https://doi.org/10.1073/pnas.1901656116 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6486725/ http://www.ncbi.nlm.nih.gov/pubmed/30962371 http://dx.doi.org/10.1073/pnas.1901656116 Published under the PNAS license (https://www.pnas.org/site/aboutpnas/licenses.xhtml) . Biological Sciences Text 2019 ftpubmed https://doi.org/10.1073/pnas.1901656116 2019-10-13T00:11:47Z Temperate species experienced dramatic range reductions during the Last Glacial Maximum, yet refugial populations from which modern populations are descended have never been precisely located. Climate-based models identify only broad areas of potential habitat, traditional phylogeographic studies provide poor spatial resolution, and pollen records for temperate forest communities are difficult to interpret and do not provide species-level taxonomic resolution. Here we harness signals of range expansion from large genomic datasets, using a simulation-based framework to infer the precise latitude and longitude of glacial refugia in two widespread, codistributed hickories (Carya spp.) and to quantify uncertainty in these estimates. We show that one species likely expanded from close to ice sheet margins near the site of a previously described macrofossil for the genus, highlighting support for the controversial notion of northern microrefugia. In contrast, the expansion origin inferred for the second species is compatible with classic hypotheses of distant displacement into southern refugia. Our statistically rigorous, powerful approach demonstrates how refugia can be located from genomic data with high precision and accuracy, addressing fundamental questions about long-term responses to changing climates and providing statistical insight into longstanding questions that have previously been addressed primarily qualitatively. Text Ice Sheet PubMed Central (PMC) Proceedings of the National Academy of Sciences 116 17 8431 8436 |
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English |
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Biological Sciences |
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Biological Sciences Bemmels, Jordan B. Knowles, L. Lacey Dick, Christopher W. Genomic evidence of survival near ice sheet margins for some, but not all, North American trees |
topic_facet |
Biological Sciences |
description |
Temperate species experienced dramatic range reductions during the Last Glacial Maximum, yet refugial populations from which modern populations are descended have never been precisely located. Climate-based models identify only broad areas of potential habitat, traditional phylogeographic studies provide poor spatial resolution, and pollen records for temperate forest communities are difficult to interpret and do not provide species-level taxonomic resolution. Here we harness signals of range expansion from large genomic datasets, using a simulation-based framework to infer the precise latitude and longitude of glacial refugia in two widespread, codistributed hickories (Carya spp.) and to quantify uncertainty in these estimates. We show that one species likely expanded from close to ice sheet margins near the site of a previously described macrofossil for the genus, highlighting support for the controversial notion of northern microrefugia. In contrast, the expansion origin inferred for the second species is compatible with classic hypotheses of distant displacement into southern refugia. Our statistically rigorous, powerful approach demonstrates how refugia can be located from genomic data with high precision and accuracy, addressing fundamental questions about long-term responses to changing climates and providing statistical insight into longstanding questions that have previously been addressed primarily qualitatively. |
format |
Text |
author |
Bemmels, Jordan B. Knowles, L. Lacey Dick, Christopher W. |
author_facet |
Bemmels, Jordan B. Knowles, L. Lacey Dick, Christopher W. |
author_sort |
Bemmels, Jordan B. |
title |
Genomic evidence of survival near ice sheet margins for some, but not all, North American trees |
title_short |
Genomic evidence of survival near ice sheet margins for some, but not all, North American trees |
title_full |
Genomic evidence of survival near ice sheet margins for some, but not all, North American trees |
title_fullStr |
Genomic evidence of survival near ice sheet margins for some, but not all, North American trees |
title_full_unstemmed |
Genomic evidence of survival near ice sheet margins for some, but not all, North American trees |
title_sort |
genomic evidence of survival near ice sheet margins for some, but not all, north american trees |
publisher |
National Academy of Sciences |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6486725/ http://www.ncbi.nlm.nih.gov/pubmed/30962371 https://doi.org/10.1073/pnas.1901656116 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6486725/ http://www.ncbi.nlm.nih.gov/pubmed/30962371 http://dx.doi.org/10.1073/pnas.1901656116 |
op_rights |
Published under the PNAS license (https://www.pnas.org/site/aboutpnas/licenses.xhtml) . |
op_doi |
https://doi.org/10.1073/pnas.1901656116 |
container_title |
Proceedings of the National Academy of Sciences |
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116 |
container_issue |
17 |
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8431 |
op_container_end_page |
8436 |
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1766030962030804992 |