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Gene flow between three eucalypt species at Snug Plains

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Davidson, NJ and Reid, JB and Potts, BM (1987) Gene flow between three eucalypt species at Snug Plains. Papers and Proceedings of the Royal Society of Tasmania, 121. pp. 101-108. ISSN 0080-4703

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Abstract

The extent of hybridisation and gene flow between the three Monocalyptus species, Eucalyptus pulchella, E coccifera (series Piperitae) and E delegatensis (series Oh/iquae) at Snug Plains (600 m) in southeastern Tasmania was examined. The flowering time of E pulchella was two months later than usual for this normally low-altitude species. It consequently overlapped the flowering period of both sub-alpine species E. coccifera and E delegatensis and had its peak f10wering period intermediate between the two. The movements of pollinators across the species boundaries indicated the potential for hybridisation between E pulchella and the other two species. Adult morphology suggested that the Snug Plains E. pulchella tended towards E. coccifera compared to typical, low-altitude E. pulchella and progeny tests reinforced this view. In addition, two out of twelve E pulchella adults sampled appeared intermediate between this species and E coccifera and produced progeny overlapping those from E coccifera. These results suggest that introgression of E. coccifera genes may be occurring into E. pulchella at Snug Plains although adaptive convergence cannot be excluded. Quite a different picture is seen for the results of hybridisation between E pulchella and E. delegatensis. Six putative Fl hybrids between E. pulchella and E. delegatensis occurred in progeny from two E. pulchella mothers. However, this appears to have had little genetic impact on the species, since no evidence of introgression or convergence was apparent in adult populations of these species.

Item Type: Article
Keywords: Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library
Journal or Publication Title: Papers and Proceedings of the Royal Society of Tasmania
Page Range: pp. 101-108
ISSN: 0080-4703
Additional Information: Copyright Royal Society of Tasmania
Date Deposited: 24 May 2012 02:47
Last Modified: 18 Nov 2014 04:35
URI: http://eprints.utas.edu.au/id/eprint/13892
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