Ice‐age persistence and genetic isolation of the disjunct distribution of larch in Alaska
Abstract Larix laricina (eastern larch, tamarack) is a transcontinental North American conifer with a prominent disjunction in the Yukon isolating the Alaskan distribution from the rest of its range. We investigate whether in situ persistence during the last glacial maximum (LGM) or long‐distance po...
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crwiley:10.1002/ece3.6031 2024-06-02T08:15:55+00:00 Ice‐age persistence and genetic isolation of the disjunct distribution of larch in Alaska Napier, Joseph D. Fernandez, Matias C. de Lafontaine, Guillaume Hu, Feng Sheng National Science Foundation 2020 http://dx.doi.org/10.1002/ece3.6031 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.6031 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.6031 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.6031 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002%2Fece3.6031 en eng Wiley http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ Ecology and Evolution volume 10, issue 3, page 1692-1702 ISSN 2045-7758 2045-7758 journal-article 2020 crwiley https://doi.org/10.1002/ece3.6031 2024-05-03T11:17:27Z Abstract Larix laricina (eastern larch, tamarack) is a transcontinental North American conifer with a prominent disjunction in the Yukon isolating the Alaskan distribution from the rest of its range. We investigate whether in situ persistence during the last glacial maximum (LGM) or long‐distance postglacial migration from south of the ice sheets resulted in the modern‐day Alaskan distribution. We analyzed variation in three chloroplast DNA regions of 840 trees from a total of 69 populations (24 new sampling sites situated on both sides of the Yukon range disjunction pooled with 45 populations from a published source) and conducted ensemble species distribution modeling (SDM) throughout Canada and United States to hindcast the potential range of L. laricina during the LGM. We uncovered the genetic signature of a long‐term isolation of larch populations in Alaska, identifying three endemic chlorotypes and low levels of genetic diversity. Range‐wide analysis across North America revealed the presence of a distinct Alaskan lineage. Postglacial gene flow across the Yukon divide was unidirectional, from Alaska toward previously glaciated Canadian regions, and with no evidence of immigration into Alaska. Hindcast SDM indicates one of the broadest areas of past climate suitability for L. laricina existed in central Alaska, suggesting possible in situ persistence of larch in Alaska during the LGM. Our results provide the first unambiguous evidence for the long‐term isolation of L. laricina in Alaska that extends beyond the last glacial period and into the present interglacial period. The lack of gene flow into Alaska along with the overall probability of larch occurrence in Alaska being currently lower than during the LGM suggests that modern‐day Alaskan larch populations are isolated climate relicts of broader glacial distributions, and so are particularly vulnerable to current warming trends. Article in Journal/Newspaper Alaska Yukon Wiley Online Library Canada Tamarack ENVELOPE(-121.170,-121.170,57.650,57.650) Yukon Ecology and Evolution 10 3 1692 1702 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Larix laricina (eastern larch, tamarack) is a transcontinental North American conifer with a prominent disjunction in the Yukon isolating the Alaskan distribution from the rest of its range. We investigate whether in situ persistence during the last glacial maximum (LGM) or long‐distance postglacial migration from south of the ice sheets resulted in the modern‐day Alaskan distribution. We analyzed variation in three chloroplast DNA regions of 840 trees from a total of 69 populations (24 new sampling sites situated on both sides of the Yukon range disjunction pooled with 45 populations from a published source) and conducted ensemble species distribution modeling (SDM) throughout Canada and United States to hindcast the potential range of L. laricina during the LGM. We uncovered the genetic signature of a long‐term isolation of larch populations in Alaska, identifying three endemic chlorotypes and low levels of genetic diversity. Range‐wide analysis across North America revealed the presence of a distinct Alaskan lineage. Postglacial gene flow across the Yukon divide was unidirectional, from Alaska toward previously glaciated Canadian regions, and with no evidence of immigration into Alaska. Hindcast SDM indicates one of the broadest areas of past climate suitability for L. laricina existed in central Alaska, suggesting possible in situ persistence of larch in Alaska during the LGM. Our results provide the first unambiguous evidence for the long‐term isolation of L. laricina in Alaska that extends beyond the last glacial period and into the present interglacial period. The lack of gene flow into Alaska along with the overall probability of larch occurrence in Alaska being currently lower than during the LGM suggests that modern‐day Alaskan larch populations are isolated climate relicts of broader glacial distributions, and so are particularly vulnerable to current warming trends. |
author2 |
National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Napier, Joseph D. Fernandez, Matias C. de Lafontaine, Guillaume Hu, Feng Sheng |
spellingShingle |
Napier, Joseph D. Fernandez, Matias C. de Lafontaine, Guillaume Hu, Feng Sheng Ice‐age persistence and genetic isolation of the disjunct distribution of larch in Alaska |
author_facet |
Napier, Joseph D. Fernandez, Matias C. de Lafontaine, Guillaume Hu, Feng Sheng |
author_sort |
Napier, Joseph D. |
title |
Ice‐age persistence and genetic isolation of the disjunct distribution of larch in Alaska |
title_short |
Ice‐age persistence and genetic isolation of the disjunct distribution of larch in Alaska |
title_full |
Ice‐age persistence and genetic isolation of the disjunct distribution of larch in Alaska |
title_fullStr |
Ice‐age persistence and genetic isolation of the disjunct distribution of larch in Alaska |
title_full_unstemmed |
Ice‐age persistence and genetic isolation of the disjunct distribution of larch in Alaska |
title_sort |
ice‐age persistence and genetic isolation of the disjunct distribution of larch in alaska |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/ece3.6031 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.6031 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.6031 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.6031 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002%2Fece3.6031 |
long_lat |
ENVELOPE(-121.170,-121.170,57.650,57.650) |
geographic |
Canada Tamarack Yukon |
geographic_facet |
Canada Tamarack Yukon |
genre |
Alaska Yukon |
genre_facet |
Alaska Yukon |
op_source |
Ecology and Evolution volume 10, issue 3, page 1692-1702 ISSN 2045-7758 2045-7758 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ece3.6031 |
container_title |
Ecology and Evolution |
container_volume |
10 |
container_issue |
3 |
container_start_page |
1692 |
op_container_end_page |
1702 |
_version_ |
1800740243357302784 |