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A common boundary between distinct northern and southern morphotypes in two unrelated Tasmanian rainforest species

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Barnes, RW and Jordan, GJ and Hill, RS and McCoull, CJ (2000) A common boundary between distinct northern and southern morphotypes in two unrelated Tasmanian rainforest species. Australian Journal of Botany, 48 (4). pp. 481-491.

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Abstract

The variation in selected leaf morphological traits was examined across the geographic ranges of two Tasmanian rainforest species, Tasmannia lanceolata (Poiret) A.C.Smith and Eucryphia milliganii Hook.f. Comparisons of field- and glasshouse-grown plants for both species showed that there is strong genetic control of all the morphological characters measured. Two distinct morphotypes, occupying similar areas of Tasmania, were identified in each species. The geographic boundary between the morphotypes is similar in both species and runs more or less east-west, separating each species into northern and southern forms. Southern E. milliganii differs from the northern form in having ovate leaves with dense marginal trichomes and a pubescent abaxial leaf lamina. A new sub-species, E. milliganii ssp. pubescens, is described to encompass this intra-specific variation in southern Tasmania. Southern T. lanceolata has encrypted stomata, contrasting with the superficial stomata of the northern form, but is not considered sufficiently different to warrant separate taxonomic status. The boundary is difficult to explain in terms of modern environmental factors. A past period of significantly different climate from the present, perhaps combined with anthropogenic fire regimes, may have enabled allopatric differentiation within each species.

Item Type: Article
Keywords: biogeography, quaternary, paleaoclimate
Journal or Publication Title: Australian Journal of Botany
Page Range: pp. 481-491
Identification Number - DOI: 10.1071/BT98044
Additional Information: The definitive version is available online at http://www.publish.csiro.au/nid/65.htm
Date Deposited: 03 Sep 2007
Last Modified: 18 Nov 2014 03:21
URI: http://eprints.utas.edu.au/id/eprint/1798
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