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Tasmansk tiger på zoo. (Wikipedia)

Forskare vill återuppliva tasmanska tigrar – får kritik

Amerikanska och australiska forskare har lyckats återskapa den tasmanska tigerns dna-sekvens till 99,9 procent, rapporterar Sky News. Därmed kan det snart vara möjligt att att återuppliva den utdöda arten.

1936 dog den sista tasmanska tigern, även kallad pungvarg. Colossal Biosciences, ett företag i Dallas, har lyckats få fram dna genom ett välbevarat exemplar av en pungvarg på ett museum i Melbourne och man hoppas nu att det kommer att vara möjligt att sätta nya pungvargar till världen.

Men metoden har kritiker. Dels menar en del att det vore bättre att satsa pengarna på att skydda nu levande djur och att det vore oetiskt att återuppliva djur till förändrade livsmiljöer. Dels menar andra att det ens är osäkert om det ör möjligt att återuppliva utdöda arter.

– Det här är en sagovetenskap, har dna-forskaren och professorn Jeremy Austin tidigare sagt.

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bakgrund
 
Tasmanska tigern
Wikipedia (en)
The thylacine (; binomial name Thylacinus cynocephalus), also commonly known as the Tasmanian tiger or Tasmanian wolf, is an extinct carnivorous marsupial that was native to the Australian mainland and the islands of Tasmania and New Guinea. The thylacine died out in New Guinea and mainland Australia around 3,600–3,200 years ago, prior to the arrival of Europeans, possibly because of the introduction of the dingo, whose earliest record dates to around the same time, but which never reached Tasmania. Prior to European settlement, around 5,000 remained in the wild on Tasmania. Beginning in the nineteenth century, they were perceived as a threat to the livestock of farmers and bounty hunting was introduced. The last known of its species died in 1936 at Hobart Zoo in Tasmania. The thylacine is widespread in popular culture and is a cultural icon in Australia. The thylacine was known as the Tasmanian tiger because of the dark transverse stripes that radiated from the top of its back, and it was called the Tasmanian wolf because it resembled a medium- to large-sized canid. The name thylacine is derived from thýlakos meaning "pouch" and ine meaning "pertaining to", and refers to the marsupial pouch. Both sexes had a pouch. The females used theirs for rearing young, and the males used theirs as a protective sheath, covering the external reproductive organs. The animal had a stiff tail and could open its jaws to an unusual extent. Recent studies and anecdotal evidence on its predatory behaviour suggest that the thylacine was a solitary ambush predator specialised in hunting small to medium-sized prey. Accounts suggest that, in the wild, it fed on small birds and mammals. It was the only member of the genus Thylacinus and family Thylacinidae to have survived until modern times. Its closest living relatives are the other members of Dasyuromorphia, including the Tasmanian devil, from which it is estimated to have split 42–36 million years ago. Intensive hunting on Tasmania is generally blamed for its extinction, but other contributing factors were disease, the introduction of and competition with dingoes, human encroachment into its habitat and climate change. The remains of the last known thylacine were discovered at the Tasmanian Museum and Art Gallery in 2022. Since extinction there have been numerous searches and reported sightings of live animals, none of which have been confirmed. The thylacine has been used extensively as a symbol of Tasmania. The animal is featured on the official coat of arms of Tasmania. Since 1996, National Threatened Species Day has been commemorated in Australia on 7 September, the date on which the last known thylacine died in 1936. Universities, museums and other institutions across the world research the animal. Its whole genome sequence has been mapped, and there are efforts to clone and bring it back to life.
 
Tasmanien
Wikipedia (en)
Tasmania (; palawa kani: lutruwita) is an island state of Australia. It is located 240 kilometres (150 miles) to the south of the Australian mainland, and is separated from it by the Bass Strait. The state encompasses the main island of Tasmania, the 26th-largest island in the world, and the surrounding 1000 islands. It is Australia's smallest and least populous state, with 573,479 residents as of June 2023. The state capital and largest city is Hobart, with around 40% of the population living in the Greater Hobart area. Tasmania is the most decentralised state in Australia, with the lowest proportion of its residents living within its capital city. Tasmania's main island was inhabited by Aboriginal peoples. It is thought that Aboriginal Tasmanians became separated from the mainland Aboriginal groups about 11,700 years ago, after rising sea levels formed Bass Strait. The island was permanently settled by Europeans in 1803 as a penal settlement of the British Empire to prevent claims to the land by the First French Empire during the Napoleonic Wars. The Aboriginal population is estimated to have been between 3,000 and 7,000 at the time of British settlement, but was almost wiped out within 30 years during a period of conflicts with settlers known as the "Black War" and the spread of infectious diseases. The conflict, which peaked between 1825 and 1831 and led to more than three years of martial law, cost the lives of almost 1,100 Aboriginal people and settlers. Under British rule, the island was initially part of the Colony of New South Wales; however, it became a separate colony under the name Van Diemen's Land (named after Anthony van Diemen) in 1825. Approximately 80,000 convicts were sent to Van Diemen's Land before this practice, known as transportation, ceased in 1853. In 1855, the present Constitution of Tasmania was enacted, and the following year the colony formally changed its name to Tasmania. In 1901, it became a state of Australia through the process of the federation of Australia. Today, Tasmania has the second smallest economy of the Australian states and territories, and comprises principally tourism, agriculture, aquaculture, education, and healthcare. Tasmania is a significant agricultural exporter, as well as a significant destination for eco-tourism. About 42% of its land area, including national parks and World Heritage Sites (21%), is protected in some form of reserve. The first environmental political party in the world was founded in Tasmania.
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