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Australian Journal of Zoology Australian Journal of Zoology Society
Evolutionary, molecular and comparative zoology
RESEARCH ARTICLE

Phylogeography of southern brown and golden bandicoots: implications for the taxonomy and distribution of endangered subspecies and species

Steven J. B. Cooper https://orcid.org/0000-0002-7843-8438 A B L , Kym Ottewell https://orcid.org/0000-0002-4273-3224 C , Anna J. MacDonald D E F , Mark Adams A B F , Margaret Byrne C , Susan M. Carthew G , Mark D. B. Eldridge https://orcid.org/0000-0002-7109-0600 H , You Li I , Lisa C. Pope J , Kathleen M. Saint B and Michael Westerman https://orcid.org/0000-0002-6762-4470 K
+ Author Affiliations
- Author Affiliations

A Australian Centre for Evolutionary Biology and Biodiversity and School of Biological Sciences, The University of Adelaide, Adelaide, SA 5005, Australia.

B Evolutionary Biology Unit, South Australian Museum, North Terrace, Adelaide, SA 5000, Australia.

C Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions, Kensington, WA 6151, Australia.

D The John Curtin School of Medical Research, The Australian National University, Acton, ACT 2601, Australia.

E Research School of Biology, The Australian National University, Acton, ACT 2601, Australia.

F Institute for Applied Ecology, University of Canberra, Canberra, ACT 2601, Australia.

G Research Institute for Environment and Livelihoods, Charles Darwin University, Darwin, NT 0909, Australia.

H Australian Museum Research Institute, Australian Museum, Sydney, NSW 2010, Australia.

I School of Life Sciences and Engineering and Biomedical Research Centre, Northwest Minzu University, Lanzhou, Gansu 730030, China.

J Institute for Social Science Research, Queensland University, Indooroopilly, Qld 4068, Australia.

K Department of Ecology, Environment and Evolution, La Trobe University, Melbourne, Vic. 3086, Australia.

L Corresponding author. Email: steve.cooper@samuseum.sa.gov.au

Australian Journal of Zoology 66(6) 379-393 https://doi.org/10.1071/ZO19052
Submitted: 30 July 2019  Accepted: 27 November 2019   Published: 8 January 2020

Abstract

Southern brown (Isoodon obesulus) and golden (Isoodon auratus) bandicoots are iconic Australian marsupials that have experienced dramatic declines since European settlement. Conservation management programs seek to protect the remaining populations; however, these programs are impeded by major taxonomic uncertainties. We investigated the history of population connectivity to inform subspecies and species boundaries through a broad-scale phylogeographic and population genetic analysis of Isoodon taxa. Our analyses reveal a major east–west phylogeographic split within I. obesulus/I. auratus, supported by both mtDNA and nuclear gene analyses, which is not coincident with the current species or subspecies taxonomy. In the eastern lineage, all Tasmanian samples formed a distinct monophyletic haplotype group to the exclusion of all mainland samples, indicative of long-term isolation of this population from mainland Australia and providing support for retention of the subspecific status of the Tasmanian population (I. o. affinis). Analyses further suggest that I. o. obesulus is limited to south-eastern mainland Australia, representing a significant reduction in known range. However, the analyses provide no clear consensus on the taxonomic status of bandicoot populations within the western lineage, with further analyses required, ideally incorporating data from historical museum specimens to fill distributional gaps.

Additional keywords: Isoodon auratus, Isoodon obesulus.


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