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The origin of Eucalyptus vernicosa, a unique shrub eucalypt

Citation

McGowen, MH and Wiltshire, RJE and Potts, BM and Vaillancourt, RE, The origin of Eucalyptus vernicosa, a unique shrub eucalypt, Biological Journal of the Linnean Society, 74, (3) pp. 397-405. ISSN 0024-4066 (2001) [Refereed Article]

DOI: doi:10.1006/bijl.2001.0588

Abstract

The morphology of the Tasmanian yellow gum eucalypts varies clinally over less than 1.5 km on Mt Arrowsmith, from small shrubs on the mountaintops (Eucalyptus vernicosa), through small trees (E. subcrenulata) in sub-alpine woodland, to tall forest trees near the base of the mountain (classified as E. johnstonii or E. subcrenulata). This cline suggests a possible origin of E. vernicosa by primary differentiation. This study examines the origin of E. vernicosa on Mt Arrowsmith and two other Tasmanian mountains using four microsatellite loci. The analysis confirmed the continuous nature of the morphological variation on Mt Arrowsmith, whereas the variation on the other mountains was discontinuous. However, no corresponding pattern of clinal variation was found in microsatellite markers, with a large discontinuity between the E. vernicosa and E. subcrenulata. Eucalyptus vernicosa populations from widely separated mountains had greater genetic affinities to each other than to parapatric populations of E. subcrenulata. Morphologically intermediate phenotypes between E. vernicosa and E. subcrenulata were genetically indistinguishable from E. vernicosa. This pattern of genetic differentiation suggests that E. vernicosa evolved in allopatry and the cline on Mt Arrowsmith arose from two gene pools converging in morphology from opposite directions. © 2001 The Linnean Society of London.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Evolutionary Biology
Research Field:Plant Systematics and Taxonomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:McGowen, MH (Dr Marian Wiltshire)
Author:Wiltshire, RJE (Dr Robert Wiltshire)
Author:Potts, BM (Professor Brad Potts)
Author:Vaillancourt, RE (Professor Rene Vaillancourt)
ID Code:23176
Year Published:2001
Web of Science® Times Cited:15
Deposited By:Plant Science
Deposited On:2001-08-01
Last Modified:2011-09-27
Downloads:0

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