Background
The fox in Tasmania poses the most dramatic new threat to
livestock agriculture and Tasmania's unique assemblage of mammalian
wildlife for over a century. Since the illegal release of
foxes into Tasmania in 2000, a number of carcasses have been
located and around 1000 fox sightings of varying quality
reported. The Tasmanian Fox Eradication Program
set up a hotline (1300 369 688) and in the period from mid June to
October 2007, 62 sightings were reported - of these, 19 were graded
as 'excellent'.
The primary problem in mounting an effective eradication
campaign is that the low density of foxes in the state makes the
identification of fox populations difficult and renders the
comprehensive targeting of eradication measures virtually
impossible. The Tasmanian government is
nevertheless working hard with a new baiting program - more than
200,000 ha has been baited to date. Because of the sensitive
nature of Tasmania's environment and wildlife, baits not taken
quickly by foxes are retrieved - a time-consuming but necessary
task.
Our project aims to provide the link between fox presence and
control by undertaking a comprehensive survey of predator scats in
Tasmania and using a PCR species identification test to identify
scats that contain fox DNA. Scats identified as originating
from foxes, will serve as a trigger for fox control measures and
increased surveillance in the surrounding area. Selected
local groups will be trained in the identification and collection
of predator scats and these groups will then be coordinated in a
systematic collection across Tasmania.
Using this approach will broaden the scope and precision of the
fox eradication program in Tasmania. In addition, additional
information on the distribution of Tasmania's other five top
carnivores including wild dogs and cats will be collected.
Goals
- Development of accurate DNA test for large carnivores
- Provision of a link between fox presence and control, by
surveying scats
- Collection of information on distribution of five other top
carnivores, including wild dogs and cats.
Progress
Blood samples from a chicken coop at Old Beach (near Hobart), a
blood stain on a road where a fox road-kill had been found (but
moved) and six predator scats have been positively identified as
containing fox DNA. 1597 scats have also been screened for fox DNA
including 601 since May 2006. Six more scats were identified
as fox in March 2008.
Five positive scat samples and the fox road-kill
were clustered in a single region in the Northern Midlands and
represent strong evidence for a hotspot of fox activity. The blood
sample from the chicken coop represents the first hard evidence of
fox activity near Hobart and implies that the range of foxes in
Tasmania may encompass most of the northern, midland and southeast
regions. That finding was one of the two main items of evidence
cited in support of the substantial increase in funding to the Fox
Eradication Program announced by the Tasmanian Government in
November 2006.
Three scat detection Labradors have now been
trained and are working in the field. These dogs are used to
follow up 'excellent' sightings and other areas considered to be
potential fox locations.
Phase 1 of 'The Great Poo Hunt', a strategic
survey of carnivore scats across the state, is being undertaken
during Autumn 2008.
Download the June 2007 issue of Uptake Update
newsletter no. 3 or read the Fox DNA project supplement (at
right) for more information.
Project collaborators:
Tasmanian Department
of Primary Industries and Water - Fox Eradication Branch
University of Canberra
University of Western Australia