Red foxes in Australia

Red foxes pose a serious conservation problem in Australia. 2012 estimates indicate that there are more than 7.2 million red foxes (Vulpes vulpes)[1] and growing with a range extending throughout most of the continental mainland.[2] The species became established in Australia through successive introductions by settlers in 1830s. Due to its rapid spread and ecological impact it has classified as one of the most damaging invasive species in Australia. Although they are legal to hunt, they may be domesticated in New South Wales.

Introduction and spread

Red foxes were introduced to the British colonies of Van Diemen's Land (as early as 1833) and the Port Phillip District and Sydney Regions of New South Wales (as early as 1845) for the purpose of the traditional English sport of fox hunting. Curiously a permanent fox population was not established on the island of Tasmania and it is widely held that they were outcompeted by the Tasmanian devil.[3] On the mainland, however, the species was successful as an apex predator. The spread of red foxes across the southern part of the continent has coincided with the spread of rabbits in Australia, another invasive species also introduced in the 19th century that is a key prey of the red fox.

Current distribution
An exotic fox in Mornington Peninsula National Park with Mange.

Established populations of red fox are found in all states and are widespread throughout the country with the exception of tropical areas of northern Queensland, the Kimberley and the Top End of the Northern Territory. From 2010, confirmed evidence of foxes in Tasmania has been reported by the state's Department of Primary Industries, Parks, Water and Environment.[4] Foxes are found in ever higher concentrations in densely populated suburban areas and in large cities such as Melbourne.[5]

It is generally less common in areas where the dingo is more prevalent; however, it has, primarily through its burrowing behaviour, achieved niche differentiation with both the feral dog and the feral cat.

Ecological damage

The West Australian conservation department, CALM, estimates introduced predators are responsible for the extinction of ten native species in that state.

The species has been directly implicated in the extinction and decline of populations of the family Potoroidae including the extinction of the Desert rat-kangaroo.[6]

The spread of the red fox population corresponds with declines in the distribution of several medium-sized ground-dwelling mammals, including brush-tailed bettongs, burrowing bettongs, rufous bettongs, bilbies, numbats, bridled nailtail wallabies and quokkas.[7] Most of these species now only live in limited areas (such as islands) where red foxes are absent or rare.

In 2016 researchers documented that some red foxes in Australia had learned to climb trees to look for baby koalas and other unsuspecting creatures such as gliders, dispelling the long-held belief that tree-dwelling creatures were safe from them.[8]

Management and control
Dead foxes displayed along a fence at Balliang, Victoria

Local eradication programs exist, although eradication has proven difficult due to the denning behaviour and nocturnal hunting, so the focus is on management with the introduction of state bounties.[9]

The main form of control is baits, typically containing 1080 poison. Fox hunting is legal in all states and they are typically shot with the aid of spotlighting at night or attracted using fox whistles during the day. The eyeshine signature (from the tapetum lucidum in the eye) of foxes, and body shape and silhouette are used to identify them.

The reintroduction of competitive species has also been suggested as a method of control. Research by the CSIRO concluded that the presence of dingos not only decrease the presence of foxes, but increase native fauna.[10] Professor Chris Johnson of James Cook University and Dr Euan Ritchie of Deakin University have advocated the reintroduction of Tasmanian Devils to the mainland to perform a similar role as evidenced by past eradication of foxes from Tasmania as well as to ensure the ongoing survival of that native species.[11][12][13][14]

Western Shield Program
Main article: Western Shield

Western Australian state government authorities conduct aerial and hand baiting on almost 35000 square kilometres (14000 sq mi) to control foxes (and feral cats) as part of the Western Shield pest management program.

Fox Free Tasmania program

According to the Tasmanian government, red foxes were introduced to the previously fox free island of Tasmania in 1999 or 2000, posing a significant threat to native wildlife including the eastern bettong and an eradication program conducted by the Tasmanian Department of Primary Industries and Water has been established.[15][16] An independent member of the Tasmanian state Parliament, Ivan Dean, has claimed that the fox introductions are a hoax, a claim the Minister for Primary Industry, David Llewellyn described as a "load of rubbish".[17] Tasmania is estimated to have the carrying capacity to support a population of up to 300000 foxes.[18]

See also

References
  1. "Impacts of Feral Animals". Game Council of New South Wales. Archived from the original on 18 April 2012. Retrieved 29 May 2012.
  2. Macdonald, David (1987). Running with the Fox. Unwin Hyman, London. p. 14. ASIN B00H1HVF8G.
  3. Bostanci, A. (2005). "A Devil of a Disease". Science. 307 (5712): 1035. doi:10.1126/science.307.5712.1035. PMID 15718445.
  4. "Latest Physical Evidence of Foxes in Tasmania". gov.au. Archived from the original on 13 March 2011. Retrieved 18 August 2013.
  5. Green, Michael (3 July 2014). "Little fox, big problem". The Age.
  6. Short, Jeff (13 September 1999). "The extinction of rat-kangaroos (Marsupialia:Potoroidae) in New South Wales, Australia". Biological Conservation. 86 (3): 365–377. doi:10.1016/S0006-3207(98)00026-3.
  7. "Threat Abatement Plan for Predation by the Red Fox (Vulpes vulpes)" (PDF). SW National Parks and Wildlife Service. 2001. Retrieved 29 May 2012.
  8. Alice Klein (10 February 2017). "Foxes seen climbing trees at night to track down and eat koalas". New Scientist.
  9. Millen, Tracey (October–November 2006). "Call for more dingoes to restore native species" (PDF). ECOS. 133. (Refers to the book Australia's Mammal Extinctions: a 50,000 year history. Christopher N. Johnson. ISBN 978-0-521-68660-0.
  10. Tracey Millen (October–November 2006). "Call for more dingoes to restore native species" (PDF). ECOS. 133. (Refers to the book Australia's Mammal Extinctions: a 50,000 year history. Christopher N. Johnson. ISBN 978-0-521-68660-0.
  11. "PM - Calls for Tasmanian Devil to return to the mainland". Abc.net.au. Retrieved 18 August 2013.
  12. "Opinion Introduced species to complicate problem". Weekly Times Now. 10 May 2012. Retrieved 18 August 2013.
  13. "The Geelong Advertiser". The Geelong Advertiser. 26 March 2012. Retrieved 18 August 2013.
  14. "Dingoes, devils may be angels in disguise › News in Science (ABC Science)". 26.000;134.500: Abc.net.au. 27 March 2012. doi:10.1016/j.tree.2012.01.001. Retrieved 18 August 2013.CS1 maint: location (link)
  15. "Hard Evidence of Foxes Discovered in Tasmania". Department of Primary Industries and Water, Tasmania website. Retrieved 19 December 2007.
  16. "Foxes in Tasmania : A Report on an Incursion by an Invasive Species" (PDF). Dpiw.tas.gov.au. Retrieved 18 August 2013.
  17. "Tassie 'hoodwinked". Mercury newspaper website. Retrieved 25 February 2008.
  18. "DRAFT: Recovery Plan for the Tasmanian devil (Sarcophilus harrisii)" (PDF). Department of Primary Industries, Parks, Water and Environment. Archived from the original (PDF) on 4 March 2011. Retrieved 14 November 2010.
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