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Interbreeding of dingoes with other domestic dogs
The interbreeding of dingoes with other domestic dogs is an ongoing process affecting the population of free ranging domestic dogs in Australia. The current population of free ranging domestic dogs in Australia is now probably higher than in the past. However, the proportion of the so-called "pure"〔Since there is no unity on the subject what dogs should be regarded as dingoes and unknown whether the observed dingoes weren't hybrids, the term ''pure'' is written in quotations in this article.〕 dingoes (dogs with exclusively dingo-ancestry) has been in the decrease over the last few decades and is regarded as further decreasing.
Because of this ongoing interbreeding of dingoes and other domestic dogs and the resulting hybrids, there is a much wider range of colours and body shapes today among the Australian wild dog population than in the time before the human introduction of domestic dogs. The full extent of the impacts of this process is currently unknown and the possibility of potential problems, as well as the wish to preserve the "pure" dingo, often leads to a strong rejection of the interbreeding.〔
==Causes, degree, and forms of interbreeding==
According to present knowledge, the dingo arrived in Australia together with seafarers four millennia ago, and reverted to the wild there. The dingo has been proven to have existed on the continent for at least 3,500 years, which was confirmed by archaeological as well as genetic examinations and findings. Additionally, it was suspected that there was later no significant introduction of other domestic dogs before the arrival of the Europeans.
European domestic dogs arrived in Australia in the 18th century, the European colonization. Since then, some of those dogs dispersed into the wild (both deliberately and accidentally) and founded feral populations, especially in places where the dingo numbers had been severely reduced due to human intervention. Although there are few records of such releases, their occurrence is supported by reports of free-living dogs of specific breeds being seen or captured in remote areas. The spread of farming and grazing activities in the 19th century led to a further spread of other domestic dogs, both pet and feral ones. Interbreeding with the native dingoes has probably been occurring since the arrival of other domestic dogs in the year 1788.〔Fleming, Corbett, Harden and Thomson (2001)〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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