A predominantly southern distribution conceals a northern reservoir of diversity in a wet sclerophyll tree

Whitehead, Michael R., Sherwin, William B., Crayn, Darren, and Rossetto, Maurizio (2019) A predominantly southern distribution conceals a northern reservoir of diversity in a wet sclerophyll tree. Australian Journal of Botany, 67 (7). pp. 455-462.

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Abstract

The wet forests of south-east Australia can be coarsely divided into cool-temperate communities characterised by relictual Gondwanan lineages with a history of persistence in scattered refugia, and subtropical communities showing stronger Malesian floristic influences, with post-glacial expansion dynamics. Insights into the assembly and dynamics of these two biomes can be gained by studying taxa that inhabit both, such as the tree species Elaeocarpus reticulatus Sm. (blueberry ash). Here we use data generated from eight microsatellite loci to investigate population structure and eco-evolutionary dynamics across the core of this species' range. Our nested sampling design allowed us to test for population differentiation along both axes of latitude and altitude, with the aim of detecting post-glacial colonisation dynamics. Our results show that the strongest genetic differentiation was associated with latitude zones, and population differentiation obeyed a typical pattern of isolation by distance. We did not find strong support for differentiation being driven by altitude. Atrend towards higher diversity in the north of the range reveals that E. reticulatus conforms more to the post-glacial colonisation dynamics typifying subtropical, rather than cool-temperate lineages.

Item ID: 61369
Item Type: Article (Research - C1)
ISSN: 1444-9862
Keywords: biogeographic barriers, dispersal, Elaeocarpus reticulatus, Great Dividing Range, population genetics, rainforest, refugia, south-east Australia
Copyright Information: Journal compilation © CSIRO 2019
Funders: Hermon Slade Foundation, Australian Research Council (ARC)
Projects and Grants: HSF grant 03-11, ARC Discovery Grant DP0665859
Date Deposited: 08 Jan 2020 07:32
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060302 Biogeography and Phylogeography @ 50%
06 BIOLOGICAL SCIENCES > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics @ 50%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960806 Forest and Woodlands Flora, Fauna and Biodiversity @ 50%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 50%
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