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- Title
Divergent lineages in a semi‐arid mallee species, Eucalyptus behriana, correspond to a major geographic break in southeastern Australia.
- Authors
Fahey, Patrick S.; Fowler, Rachael M.; McLay, Todd G. B.; Udovicic, Frank; Cantrill, David J.; Bayly, Michael J.
- Abstract
Aim: To infer relationships between populations of the semi‐arid, mallee eucalypt, Eucalyptus behriana, to build hypotheses regarding evolution of major disjunctions in the species' distribution and to expand understanding of the biogeographical history of southeastern Australia. Location: Southeastern Australia. Taxon: Eucalyptus behriana (Myrtaceae, Angiospermae). Methods: We developed a large dataset of anonymous genomic loci for 97 samples from 11 populations of E. behriana using double digest restriction site‐associated DNA sequencing (ddRAD‐seq), to determine genetic relationships between the populations. These relationships, along with species distribution models, were used to construct hypotheses regarding environmental processes that have driven fragmentation of the species' distribution. Results: Greatest genetic divergence was between populations on either side of the Lower Murray Basin. Populations west of the Basin showed greater genetic divergence between one another than the eastern populations. The most genetically distinct population in the east (Long Forest) was separated from others by the Great Dividing Range. A close relationship was found between the outlying northernmost population (near West Wyalong) and those in the Victorian Goldfields despite a large disjunction between them. Conclusions: Patterns of genetic variation are consistent with a history of vicariant differentiation of disjunct populations. We infer that an early disjunction to develop in the species distribution was that across the Lower Murray Basin, an important biogeographical barrier separating many dry sclerophyll plant taxa in southeastern Australia. Additionally, our results suggest that the western populations fragmented earlier than the eastern ones. Fragmentation, both west and east of the Murray Basin, is likely tied to climatic changes associated with glacial‐interglacial cycles although it remains possible that major geological events including uplift of the Mount Lofty Ranges and basalt flows in the Newer Volcanics Province also played a role.
- Subjects
AUSTRALIA; GREAT Dividing Range; EUCALYPTUS; SPECIES distribution; CLIMATE change; SPECIES; NUCLEOTIDE sequence; POPULATION differentiation
- Publication
Ecology & Evolution (20457758), 2021, Vol 11, Issue 1, p664
- ISSN
2045-7758
- Publication type
Article
- DOI
10.1002/ece3.7099