Phenetic affinities, variability and conservation status of a rare Tasmanian endemic Eucalyptus morrisbyi R.G.Brett
Wiltshire, RJE and Potts, BM and Reid, JB (1991) Phenetic affinities, variability and conservation status of a rare Tasmanian endemic Eucalyptus morrisbyi R.G.Brett. Papers and Proceedings of the Royal Society of Tasmania, Aspects of Tasmanian Botany: A Tribute to Winifred Curtis: A Symposium arranged by the Royal Society of Tasmania March 1991 . pp. 213-230. ISSN 0080-4703
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Eucalyptus morrisbyi is a rare Tasmanian endemic confined to one larger population (c, 2000 mature individuals) and two
smaller populations (c, 15 and 16 mature individuals; in southeastern Tasmania. Morphological studies within the informal
superspecies "Gunnii" reveal Eucalyptus morrisbyi has closest affinities to low altitude populations of E, gunnii In southeastern
Tasmania and yet has distinct, phenetic differences from that species. Levels of variation in E. morrisbyi populations appear
comparable to other species despite their small population size. A low frequency of hybridisation occurs with E, viminalis in
natural stands but is unlikely to have affected the level of variability in the Calverts Hill and Risdon Hill natural populations.
In contrast, it is shown that a high frequency of seedlings grown from a planted and a remnant stand of E, morrisbyi have affinities
with E, virninalis. Several of the planted trees appeared to be hybrids and some progeny from phenotypically normal trees also
appeared to be of hybrid origin. These results suggest that the genetic integrity of the species may be compromised by injudicious
selection of seed for propagation from plantings and could be a major problem for the ex situ conservation of this and other rare
and endangered species. Recommendations are given to enhance the conservation of this endangered Tasmanian endemic.
|Additional Information:||This Symposium is a tribute to the botanical work of Dr. Winifred M. Curtis AM, work largely concerned with Tasmanian plants. Scientific and public knowledge of the Tasmania flora has been greatly enhanced by her contributions.
Edited by M.R. Banks, S.J. Smith, A.E. Orchard and G. Kantvilas. – Copyright Royal Society of Tasmania
|Keywords:||Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library|
|Deposited By:||p doyle|
|Deposited On:||03 Aug 2012 11:19|
|Last Modified:||15 Aug 2012 11:23|
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