Library Open Repository

Comparison of contemporary mating patterns in continuous and fragmented Eucalyptus globulus native forests

Downloads

Downloads per month over past year

Mimura, M and Barbour, RC and Potts, BM and Vaillancourt, RE and Watanabe, KN (2009) Comparison of contemporary mating patterns in continuous and fragmented Eucalyptus globulus native forests. Molecular Ecology, 18. pp. 4180-4192. ISSN 0962-1083

[img] PDF
Mimura_et_al._2009_Mol_Ecol_gene_flow.pdf | Request a copy
Full text restricted
Available under University of Tasmania Standard License.

Abstract

While habitat fragmentation is a central issue in forest conservation studies in the face of broad-scale anthropogenic changes to the environment, its effects on contemporary mating patterns remain controversial. This is partly because of the inherent variation in mating patterns which may exist within species and the fact that few studies have replication at the landscape level. To study the effect of forest fragmentation on contemporary mating patterns, including effective pollen dispersal, we compared four native populations of the Australian forest tree, Eucalyptus globulus. We used six microsatellite markers to genotype 1289 open-pollinated offspring from paired fragmented and continuous populations on the island of Tasmania and in Victoria on mainland Australia. The mating patterns in the two continuous populations were similar, despite large differences in population density. In contrast, the two fragmented populations were variable and idiosyncratic in their mating patterns, particularly in their pollen dispersal kernels. The continuous populations showed relatively high outcrossing rates (86–89%) and low correlated paternity (0.03–0.06) compared with the fragmented populations (65–79% and 0.12–0.20 respectively). A greater proportion of trees contributed to reproduction in the fragmented (de ⁄ d ‡ 0.5) compared with the continuous populations (de ⁄ d = 0.03–0.04). Despite significant inbreeding in the offspring of the fragmented populations, there was little evidence of loss of genetic diversity. It is argued that enhanced medium- and long-distance dispersal in fragmented landscapes may act to partly buffer the remnant populations from the negative effects of inbreeding and drift.

Item Type: Article
Keywords: effective density, eucalypt, forest remnants, KINDIST, mating patterns, pollen dispersal
Journal or Publication Title: Molecular Ecology
Page Range: pp. 4180-4192
ISSN: 0962-1083
Identification Number - DOI: 10.1111/j.1365-294X.2009.04350.x
Additional Information: The original publication is available at http://www.interscience.wiley.com/
Date Deposited: 07 Oct 2009 00:51
Last Modified: 18 Nov 2014 04:06
URI: http://eprints.utas.edu.au/id/eprint/9277
Item Statistics: View statistics for this item

Repository Staff Only (login required)

Item Control Page Item Control Page