Phylogeographic patterns inPackera subnudareveal an east–west divergence along the Continental Divide and reduced haplotype diversity in northern populations

Author:

Burke J.L.1,Golden J.L.1,Dobing S.1,Bain J.F.1

Affiliation:

1. Department of Biological Sciences, University of Lethbridge, Lethbridge, AB T1K 3M4, Canada.

Abstract

Packera subnuda (DC.) D.K. Trock & T.M. Barkley is a cordilleran species that is unusual within Packera in possessing diverse cpDNA haplotypes but no intrapopulational cpDNA diversity in the populations so far examined. In an effort to determine what factors are shaping this lack of diversity and whether it persists throughout the species, we sampled extensively throughout the range of the species. Unlike previous results, new population samples were not all monomorphic for cpDNA and some contained diverse haplotypes. Overall, the haplotype diversity pattern revealed, with one exception, a split into two groups separated by the Continental Divide. The exception (Beartooth Mountains, Wyo., USA) suggests the key factor in shaping the groups’ distributions may be the proximity to prairie populations of Packera species that increases the likelihood of hybridization. The pattern of diversity in ITS repeat type revealed in previous studies was also examined in more detail, with diversity found at both the intraindividual and intrapopulational level. ITS revealed a similar east–west separation into two groups on either side of the Continental Divide. Overall, the pattern suggests ancient hybridization injected haplotype and repeat type diversity into the species and that this diversity has since been reduced by the effects of drift in small populations, most significantly in populations at the northern and eastern edge of the range.

Publisher

Canadian Science Publishing

Subject

Plant Science,Ecology,Ecology, Evolution, Behavior and Systematics

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3