Episodic migration of oaks to Iceland: Evidence for a North Atlantic “land bridge” in the latest Miocene
Dating the subsidence history of the North Atlantic Land Bridge (NALB) is crucial for understanding intercontinental disjunctions of northern temperate trees. Traditionally, the NALB has been assumed to have functioned as a corridor for plant migration only during the early Cenozoic, but recent find...
Published in: | American Journal of Botany |
---|---|
Main Authors: | , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2010
|
Subjects: | |
Online Access: | http://dx.doi.org/10.3732/ajb.0900195 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.3732%2Fajb.0900195 http://onlinelibrary.wiley.com/wol1/doi/10.3732/ajb.0900195/fullpdf |
id |
crwiley:10.3732/ajb.0900195 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.3732/ajb.0900195 2024-06-23T07:53:56+00:00 Episodic migration of oaks to Iceland: Evidence for a North Atlantic “land bridge” in the latest Miocene Denk, Thomas Grímsson, Friðgeir Zetter, Reinhard Vetenskapsrådet 2010 http://dx.doi.org/10.3732/ajb.0900195 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.3732%2Fajb.0900195 http://onlinelibrary.wiley.com/wol1/doi/10.3732/ajb.0900195/fullpdf en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor American Journal of Botany volume 97, issue 2, page 276-287 ISSN 0002-9122 1537-2197 journal-article 2010 crwiley https://doi.org/10.3732/ajb.0900195 2024-06-13T04:25:33Z Dating the subsidence history of the North Atlantic Land Bridge (NALB) is crucial for understanding intercontinental disjunctions of northern temperate trees. Traditionally, the NALB has been assumed to have functioned as a corridor for plant migration only during the early Cenozoic, but recent findings of plant fossils and inferences from molecular studies are challenging this view. Here, we report dispersed pollen of Quercus from Late Miocene sediments in Iceland that shows affinities with extant northern hemispheric white oaks and North American red oaks. Older (15 to 10 Ma) sediments do not contain pollen of Quercus suggesting it arrived after that time. Pollen from the 9–8 Ma Hrútagil locality is indistinguishable from morphotypes common among white and red oaks. In contrast, pollen from the 5.5 Ma Selárgil locality has a tectum that is at present confined to North American white and red oaks, indicating a second episode of migration to Iceland. These findings suggest that transatlantic migration of temperate plant taxa may not have been limited by vast areas of sea or by cold climates during the Miocene. Furthermore, our results offer a plausible explanation for the remarkably low degree of genetic differentiation between modern disjunct European and North American oaks. Article in Journal/Newspaper Iceland North Atlantic Wiley Online Library Hrútagil ENVELOPE(-18.978,-18.978,65.272,65.272) American Journal of Botany 97 2 276 287 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Dating the subsidence history of the North Atlantic Land Bridge (NALB) is crucial for understanding intercontinental disjunctions of northern temperate trees. Traditionally, the NALB has been assumed to have functioned as a corridor for plant migration only during the early Cenozoic, but recent findings of plant fossils and inferences from molecular studies are challenging this view. Here, we report dispersed pollen of Quercus from Late Miocene sediments in Iceland that shows affinities with extant northern hemispheric white oaks and North American red oaks. Older (15 to 10 Ma) sediments do not contain pollen of Quercus suggesting it arrived after that time. Pollen from the 9–8 Ma Hrútagil locality is indistinguishable from morphotypes common among white and red oaks. In contrast, pollen from the 5.5 Ma Selárgil locality has a tectum that is at present confined to North American white and red oaks, indicating a second episode of migration to Iceland. These findings suggest that transatlantic migration of temperate plant taxa may not have been limited by vast areas of sea or by cold climates during the Miocene. Furthermore, our results offer a plausible explanation for the remarkably low degree of genetic differentiation between modern disjunct European and North American oaks. |
author2 |
Vetenskapsrådet |
format |
Article in Journal/Newspaper |
author |
Denk, Thomas Grímsson, Friðgeir Zetter, Reinhard |
spellingShingle |
Denk, Thomas Grímsson, Friðgeir Zetter, Reinhard Episodic migration of oaks to Iceland: Evidence for a North Atlantic “land bridge” in the latest Miocene |
author_facet |
Denk, Thomas Grímsson, Friðgeir Zetter, Reinhard |
author_sort |
Denk, Thomas |
title |
Episodic migration of oaks to Iceland: Evidence for a North Atlantic “land bridge” in the latest Miocene |
title_short |
Episodic migration of oaks to Iceland: Evidence for a North Atlantic “land bridge” in the latest Miocene |
title_full |
Episodic migration of oaks to Iceland: Evidence for a North Atlantic “land bridge” in the latest Miocene |
title_fullStr |
Episodic migration of oaks to Iceland: Evidence for a North Atlantic “land bridge” in the latest Miocene |
title_full_unstemmed |
Episodic migration of oaks to Iceland: Evidence for a North Atlantic “land bridge” in the latest Miocene |
title_sort |
episodic migration of oaks to iceland: evidence for a north atlantic “land bridge” in the latest miocene |
publisher |
Wiley |
publishDate |
2010 |
url |
http://dx.doi.org/10.3732/ajb.0900195 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.3732%2Fajb.0900195 http://onlinelibrary.wiley.com/wol1/doi/10.3732/ajb.0900195/fullpdf |
long_lat |
ENVELOPE(-18.978,-18.978,65.272,65.272) |
geographic |
Hrútagil |
geographic_facet |
Hrútagil |
genre |
Iceland North Atlantic |
genre_facet |
Iceland North Atlantic |
op_source |
American Journal of Botany volume 97, issue 2, page 276-287 ISSN 0002-9122 1537-2197 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.3732/ajb.0900195 |
container_title |
American Journal of Botany |
container_volume |
97 |
container_issue |
2 |
container_start_page |
276 |
op_container_end_page |
287 |
_version_ |
1802645844149665792 |