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Not an ancient relic: the endemic Livistona palms of arid central Australia could have been introduced by humans

Citation

Kondo, T and Crisp, MD and Linde, C and Bowman, DMJS and Kawamura, K and Kaneko, S and Isagi, Y, Not an ancient relic: the endemic Livistona palms of arid central Australia could have been introduced by humans, Royal Society of London. Proceedings. Biological Sciences, 279 pp. 2652-2661. ISSN 0962-8452 (2012) [Refereed Article]


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Copyright Statement

Copyright 2012 The Royal Society

DOI: doi:10.1098/rspb.2012.0103

Abstract

Livistona mariae is an endemic palm localized in arid central Australia. This species is separated by about 1000 km from its congener L. rigida, which grows distantly in the Roper River and Nicholson–Gregory River catchments in northern Australia. Such an isolated distribution of L. mariae has been assumed to have resulted from contraction of ancestral populations as Australia aridified from the Mid-Miocene (ca 15 Ma). To test this hypothesis at the population level, we examined the genetic relationships among 14 populations of L. mariae and L. rigida using eight nuclear microsatellite loci. Our population tree and Bayesian clustering revealed that these populations comprised two genetically distinct groups that did not correspond to the current classification at species rank, and L. mariae showed closest affinity with L. rigida from Roper River. Furthermore, coalescent divergence-time estimations suggested that the disjunction between the northern populations (within L. rigida) could have originated by intermittent colonization along an ancient river that has been drowned repeatedly by marine transgression. During that time, L. mariae populations could have been established by opportunistic immigrants from Roper River about 15 000 years ago, concurrently with the settlement of indigenous Australians in central Australia, who are thus plausible vectors. Thus, our results rule out the ancient relic hypothesis for the origin of L. mariae.

Item Details

Item Type:Refereed Article
Keywords:coalescence; divergence-time estimation; microsatellite; palms; phylogeography
Research Division:Biological Sciences
Research Group:Evolutionary Biology
Research Field:Biogeography and Phylogeography
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Flora, Fauna and Biodiversity at Regional or Larger Scales
Author:Bowman, DMJS (Professor David Bowman)
ID Code:82208
Year Published:2012
Web of Science® Times Cited:18
Deposited By:Plant Science
Deposited On:2013-01-21
Last Modified:2017-11-01
Downloads:1 View Download Statistics

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