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Published: 7 November 2011

Bettongs have bounced back to Canberra


Observed by Burke and Wills as plentiful during their Australian expedition in 1860, the Eastern Bettong was made extinct by foxes, cats and pastoralism by the mid-1920s. Now, in a conservation twist, surviving populations in Tasmania are also under threat from these pressures, and so have been re-introduced to restored habitat near Canberra.

The Eastern or Tasmanian Bettong, <i>Bettongia gaimardi</i>.
The Eastern or Tasmanian Bettong, Bettongia gaimardi.
Credit: Courtesy of the ACT Government

The Eastern Bettong (Bettongia gaimardi), also known as the Tasmanian Bettong, is a small member of the kangaroo family that ranged along the entire eastern seaboard of Australia. The Bettongs are only listed as “near threatened” in Tasmania (under the IUCN Red List), but the arrival of the European fox has raised the threat to their numbers.

As insurance, a breeding colony of 30 Bettongs have been imported to Tidbinbilla outside Canberra. The plan is for progeny from this colony to be released – or reintroduced – next year into a larger, protected grassy woodlands restoration project being carried out in Mulligans Flat and Goorooyarroo Nature Reserves, a collaboration between the ACT Government, the CSIRO, and led by Dr Adrian Manning of the ANU’s Fenner School.

The restoration project itself aims to better understand the grassy woodland communities and give land managers and the wider community the tools to improve and protect them.

Announcing the return of the Bettongs to the ACT, state Minister for Environment and Sustainable Development, Simon Corbell, said, ‘The arrival of the Eastern Bettong from Tasmania is a critical first step in returning a locally extinct species to our grassy woodlands.’

‘It is thought that Eastern Bettongs serve as “ecosystem engineers” in woodlands, turning over the soil, and improving the penetration of water and nutrients.’

Tasmania’s Department of Primary Industry, Parks, Water and the Environment granted funding, necessary approvals and provided important logistical support for the Bettongs’ transfer to the ACT.

Source: ACT government







Published: 2010

Salinity changes show wetter wet regions, drier arid ones


Evidence that the world’s water cycle is changing, making arid regions drier and high rainfall regions wetter as atmospheric temperature increases, is contained in new research published online in the Journal of Climate.1

Ocean salinity changes indicate that arid regions are becoming drier.
Ocean salinity changes indicate that arid regions are becoming drier.
Credit: ScienceImage/Greg Heath

The study, co-authored by Hobart-based CSIRO scientists Paul Durack and Dr Susan Wijffels, shows the surface ocean beneath rainfall-dominated regions has freshened, whereas ocean regions dominated by evaporation are saltier.

The paper also confirms that surface warming of the world’s oceans over the past 50 years has penetrated into the oceans’ interior, changing deep-ocean salinity patterns.

The research was based on historical records and data provided by the Argo Program’s worldwide network of ocean profilers – robotic submersible buoys that record and report ocean salinity levels and temperatures to depths of two kilometres.


1 Journal of Climate, http://tiny.cc/mb35z




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