Episodic migration of oaks to Iceland: Evidence for a North Atlantic "land bridge" in the latest Miocene

American Journal of Botany
Thomas DenkReinhard Zetter

Abstract

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...Continue Reading

References

Sep 26, 2003·Nature·Richard H Tedford, C Richard Harington
Nov 3, 2004·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Michael J Donoghue, Stephen A Smith

Citations

Feb 14, 2012·Molecular Phylogenetics and Evolution·Ling-Yun ChenQing-Feng Wang
Jul 5, 2015·Journal of Plant Research·Lin-Bo JiaZhe-Kun Zhou
Jan 22, 2013·Molecular Phylogenetics and Evolution·Ling-Yun ChenQing-Feng Wang
May 21, 2014·Molecular Phylogenetics and Evolution·Ling-Yun ChenMichael L Moody
Jan 10, 2012·Systematic Biology·Christine D BaconMark P Simmons
Mar 19, 2015·American Journal of Botany·Thomas DenkLilian Ferrufino-Acosta
Mar 22, 2012·American Journal of Botany·Emily B SessaThomas J Givnish
Oct 21, 2019·The New Phytologist·Antoine Kremer, Andrew L Hipp
Oct 15, 2019·The New Phytologist·Andrew L HippSusana Valencia-Avalos
May 19, 2017·Proceedings. Biological Sciences·John D McVayPaul S Manos

Related Concepts

Pollen
Trees (plant)
Comprehension
Quercus
Quercus rubra
Quercus alba
American
Genetic Drift
Ma+Ta Antibody
European Race

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