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The origin of Eucalyptus vernicosa, a unique shrub eucalypt

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posted on 2023-05-16, 13:15 authored by Marian WiltshireMarian Wiltshire, Robert Wiltshire, Bradley PottsBradley Potts, Rene VaillancourtRene Vaillancourt
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.

History

Publication title

Biological Journal of the Linnean Society

Volume

74

Pagination

397-405

ISSN

0024-4066

Department/School

School of Natural Sciences

Publisher

Blackwell Science Ltd

Place of publication

Oxford, UK

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the environmental sciences

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