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Effect of forest fragmentation and altitude on the mating system of Eucalyptus pauciflora (Myrtaceae)


Gauli, A and Vaillancourt, RE and Steane, DA and Bailey, TG and Potts, BM, Effect of forest fragmentation and altitude on the mating system of Eucalyptus pauciflora (Myrtaceae), Australian Journal of Botany, 61, (8) pp. 622-632. ISSN 0067-1924 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 CSIRO

DOI: doi:10.1071/BT13259


Habitat fragmentation is a key factor causing variation in important mating system parameters in plants, but its effect is variable. We studied mating system variation among 276 native trees from 37 populations of Eucalyptus pauciflora from Tasmania. We assayed 10 microsatellite loci from 1359 open-pollinated progeny from these trees. Across Tasmania the species’ mating system was characterised by a high outcrossing rate (tm = 0.90) but moderate bi-parental inbreeding (tm–tms = 0.16) and moderate correlated paternity (rP = 0.20) in comparison to other eucalypt species. Despite significant differences in outcrossing rate and correlated paternity among populations, this variation was not correlated with fragmentation. Nevertheless, fragmentation was inversely correlated with the number of germinants per gram of seed capsule content. Outcrossing rate had been reported previously to decrease with increasing altitude in mainland populations of E. pauciflora, but this was not the case in Tasmania. However, a small but significant decrease in correlated paternity occurred with increasing altitude and a decrease in bi-parental inbreeding with increasing altitude was evident in fragmented populations only. It is argued that strong, but incomplete self-incompatibility mechanisms may buffer the mating system from changes in population density and pollinators. While seed yields from highly fragmented populations were reduced, in most cases the seed obtained is unlikely to be more inbred than that from non-fragmented populations and, thus, is likely to be as suitable for use in local forest restoration.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Genetics not elsewhere classified
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:Gauli, A (Ms Archana Gauli)
UTAS Author:Vaillancourt, RE (Professor Rene Vaillancourt)
UTAS Author:Steane, DA (Dr Dorothy Steane)
UTAS Author:Bailey, TG (Dr Tanya Bailey)
UTAS Author:Potts, BM (Professor Brad Potts)
ID Code:90005
Year Published:2013
Web of Science® Times Cited:13
Deposited By:Plant Science
Deposited On:2014-03-24
Last Modified:2014-04-30

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