Allopatric divergence, demographic history, and conservation implications of an endangered conifer Cupressus chengiana in the eastern Qinghai-Tibet Plateau

Allopatric divergence, demographic history, and conservation implications of an endangered... Isolation and demographic history are key factors that affect lineage divergence of tree species in topographic complex areas, such as the Qinghai-Tibet Plateau (QTP), yet few studies have evaluated these factors in a coalescent-based modeling framework. In the present study, we surveyed ten nuclear DNA sequence loci (nDNA) and six nuclear microsatellite loci (nSSR) for an endangered conifer, Cupressus chengiana, throughout its natural range in the eastern QTP. BARRIER analyses revealed a strong genetic barrier between Gansu and Sichuan populations of C. chengiana, and isolation with migration models detected limited gene flow between them, supporting the division of this species into two evolutionary significant units (ESUs). Two independent coalescent-based approaches suggest a Quaternary divergence between ESUs, their consensus age range ((0.09–) 0.59–1.53 (–2.71) Mya) largely overlaps with the time period when the largest glaciation occurred in the QTP. Both demographic inferences, IMa2 and DIYABC, suggest that both ESUs may have experienced a bottleneck or population contraction event during the late Quaternary. A documented massive recent anthropogenic habitat loss and fragmentation may have led to further decrease of the natural distribution of this conifer. We propose that the conservation and management of both natural stands and plantations of C. chengiana should be reconsidered in the light of our findings. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tree Genetics & Genomes Springer Journals

Allopatric divergence, demographic history, and conservation implications of an endangered conifer Cupressus chengiana in the eastern Qinghai-Tibet Plateau

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by Springer-Verlag GmbH Germany
Subject
Life Sciences; Forestry; Plant Genetics and Genomics; Plant Breeding/Biotechnology; Tree Biology; Biotechnology
ISSN
1614-2942
eISSN
1614-2950
D.O.I.
10.1007/s11295-017-1183-3
Publisher site
See Article on Publisher Site

Abstract

Isolation and demographic history are key factors that affect lineage divergence of tree species in topographic complex areas, such as the Qinghai-Tibet Plateau (QTP), yet few studies have evaluated these factors in a coalescent-based modeling framework. In the present study, we surveyed ten nuclear DNA sequence loci (nDNA) and six nuclear microsatellite loci (nSSR) for an endangered conifer, Cupressus chengiana, throughout its natural range in the eastern QTP. BARRIER analyses revealed a strong genetic barrier between Gansu and Sichuan populations of C. chengiana, and isolation with migration models detected limited gene flow between them, supporting the division of this species into two evolutionary significant units (ESUs). Two independent coalescent-based approaches suggest a Quaternary divergence between ESUs, their consensus age range ((0.09–) 0.59–1.53 (–2.71) Mya) largely overlaps with the time period when the largest glaciation occurred in the QTP. Both demographic inferences, IMa2 and DIYABC, suggest that both ESUs may have experienced a bottleneck or population contraction event during the late Quaternary. A documented massive recent anthropogenic habitat loss and fragmentation may have led to further decrease of the natural distribution of this conifer. We propose that the conservation and management of both natural stands and plantations of C. chengiana should be reconsidered in the light of our findings.

Journal

Tree Genetics & GenomesSpringer Journals

Published: Aug 22, 2017

References

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