Fossils reveal late Holocene diversity and post-European decline of the terrestrial mammals of the Murray–Darling Depression
Diana A. Fusco A C , Matthew C. McDowell A , Graham Medlin B and Gavin J. Prideaux A
+ Author Affiliations
- Author Affiliations
A School of Biological Sciences, Flinders University, Sturt Road, Bedford Park, SA 5042, Australia.
B Mammal Section, South Australian Museum, North Terrace, Adelaide, SA 5000, Australia.
C Corresponding author. Email: diana.fusco@flinders.edu.au
Wildlife Research 44(1) 60-71 https://doi.org/10.1071/WR16134
Submitted: 18 January 2016 Accepted: 18 January 2017 Published: 27 March 2017
Abstract
Context: Establishing appropriate faunal baselines is critical for understanding and abating biodiversity declines. However, baselines can be highly reliant on historical records that come from already disturbed ecosystems. This is exemplified in the Murray–Darling Depression bioregion of Australia, where European settlement (and accompanying marked land-management changes and the introduction of many species) triggered rapid declines and losses of native species, often before their documentation.
Aims: We aim to establish the mammal fauna present when Europeans settled the Murray Mallee and Murray–Darling Depression bioregion and determine the extent of mammal loss since European settlement.
Methods: We describe a dated vertebrate assemblage from Light’s Roost in the lower Murray Mallee region of South Australia. We compare our data with those of modern fauna surveys and historical records to document the extent of change in the mammal fauna since European settlement.
Key results: Radiocarbon ages showed that the assemblage was accumulating, at a minimum, within an interval from 1900 to 1300 years ago. Since this time, the Murray–Darling Depression has lost half of its flightless terrestrial mammals. Species lost include the mulgara (Dasycercus blythi/cristicauda), which places this taxon within only 40 km of Lake Alexandrina, the hitherto-disputed type locality for D. cristicauda. Fossils provided the principal evidence for nearly half of the Murray Mallee fauna and over three-quarters of the fauna are represented in the fossil record.
Conclusions: Late Holocene assemblages provide important archives of species biogeography and diversity. Our revised faunal baseline indicated that the pre-European fauna of the Murray–Darling Depression was more diverse than hitherto understood and its reduction appears largely caused by the impacts of European settlement.
Implications: Baselines for species distributions derived from historical records and modern faunal surveys are likely to be incomplete and warrant revision, particularly for smaller and more cryptic species. Deficiencies in regional records mask the extent of mammal declines caused by European colonisation and associated agricultural practices, and thus vulnerability to anthropogenic disturbance.
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