136-660: The tiger snake ( Notechis scutatus ) is a large and highly venomous snake of southern Australia, including its coastal islands and Tasmania . These snakes are often observed and locally well known by their banding, black and yellow like a tiger , although the species can be highly variable in colouration and patterning. All populations are classified within the genus Notechis ( Elapidae ). Their diverse characteristics have been classified either as distinct species or by subspecies and regional variation. While tiger snakes are usually ground-dwelling, they are able to swim as well as climb into trees and buildings. The genus Notechis
272-696: A European was on 24 November 1642 by Dutch explorer Abel Tasman , who landed at today's Blackman Bay . More than a century later, in 1772, a French expedition led by Marc-Joseph Marion du Fresne landed at (nearby but different) Blackmans Bay , and the following year Tobias Furneaux became the first Englishman to land in Tasmania when he arrived at Adventure Bay , which he named after his ship HMS Adventure . Captain James Cook also landed at Adventure Bay in 1777. Matthew Flinders and George Bass sailed through Bass Strait in 1798–1799, determining for
408-585: A Proclamation of Demarcation forbidding Aboriginal people to enter the settled districts without a passport issued by the government. Arthur declared martial law in the colony in November that year, and this remained in force for over three years, the longest period of martial law in Australian history. In November 1830, Arthur organised the so-called " Black Line ", ordering every able-bodied male colonist to assemble at one of seven designated places in
544-423: A mutation–selection balance . It is predicted that a viral quasispecies at a low but evolutionarily neutral and highly connected (that is, flat) region in the fitness landscape will outcompete a quasispecies located at a higher but narrower fitness peak in which the surrounding mutants are unfit, "the quasispecies effect" or the "survival of the flattest". There is no suggestion that a viral quasispecies resembles
680-451: 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%),
816-515: A taxonomic rank of an organism, as well as a unit of biodiversity . Other ways of defining species include their karyotype , DNA sequence, morphology , behaviour, or ecological niche . In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. About 14% of these had been described by 2011. All species (except viruses ) are given
952-542: A two-part name , called a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature , also sometimes in zoological nomenclature ). For example, Boa constrictor is one of the species of the genus Boa , with constrictor being the species' epithet. While the definitions given above may seem adequate at first glance, when looked at more closely they represent problematic species concepts. For example,
1088-400: A "classical" method of determining species, such as with Linnaeus, early in evolutionary theory. However, different phenotypes are not necessarily different species (e.g. a four-winged Drosophila born to a two-winged mother is not a different species). Species named in this manner are called morphospecies . In the 1970s, Robert R. Sokal , Theodore J. Crovello and Peter Sneath proposed
1224-424: A 'smallest clade' idea" (a phylogenetic species concept). Mishler and Wilkins and others concur with this approach, even though this would raise difficulties in biological nomenclature. Wilkins cited the ichthyologist Charles Tate Regan 's early 20th century remark that "a species is whatever a suitably qualified biologist chooses to call a species". Wilkins noted that the philosopher Philip Kitcher called this
1360-470: A 50-metre canopy and are varied by environmental factors. Emergent growth usually comes from eucalyptus , which can tower another 50 metres higher (usually less), providing the most common choice of nesting for giant wedge-tailed eagles . The human environment ranges from urban or industrial development to farming or grazing land. The most cultivated area is the Midlands , where it has suitable soil but
1496-406: A band of Aboriginal Tasmanians who had not been removed from the island. Van Diemen's Land—which thus far had existed as a territory within the colony of New South Wales —was proclaimed a separate colony, with its own judicial establishment and Legislative Council , on 3 December 1825. Transportation to the island ceased in 1853 and the colony was renamed Tasmania in 1856, partly to differentiate
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#17327869315921632-402: A bite include localized pain in the foot and neck region, tingling, numbness, and sweating, followed by a fairly rapid onset of breathing difficulties and paralysis. In a study, the mortality rate from untreated bites is reported to be between 40% and 60%. Treatment is the same for all Australian venomous snakes . The pressure immobilization method is used to inhibit the flow of venom through
1768-428: A connected series of neighbouring populations, each of which can sexually interbreed with adjacent related populations, but for which there exist at least two "end" populations in the series, which are too distantly related to interbreed, though there is a potential gene flow between each "linked" population. Such non-breeding, though genetically connected, "end" populations may co-exist in the same region thus closing
1904-432: A different species from its ancestors. Viruses have enormous populations, are doubtfully living since they consist of little more than a string of DNA or RNA in a protein coat, and mutate rapidly. All of these factors make conventional species concepts largely inapplicable. A viral quasispecies is a group of genotypes related by similar mutations, competing within a highly mutagenic environment, and hence governed by
2040-508: A genetic boundary suitable for defining a species concept is present. DNA barcoding has been proposed as a way to distinguish species suitable even for non-specialists to use. One of the barcodes is a region of mitochondrial DNA within the gene for cytochrome c oxidase . A database, Barcode of Life Data System , contains DNA barcode sequences from over 190,000 species. However, scientists such as Rob DeSalle have expressed concern that classical taxonomy and DNA barcoding, which they consider
2176-477: A government notice declaring that colonists were free to kill Aboriginal people when they attacked settlers or their property, and in the following eight months more than 200 Aboriginal people were killed in the Settled Districts in reprisal for the deaths of 15 colonists. After another eight months, the death toll had risen to 43 colonists and probably 350 Aboriginal people. In April 1828, Arthur issued
2312-488: A high concentration of waterfalls . These can be found in small creeks, alpine streams , rapid rivers , or off precipitous plunges. Some of the tallest waterfalls are found on mountain massifs , sometimes at a 200-metre cascade. The most famous and most visited waterfall in Tasmania is Russell Falls in Mount Field due to its proximity to Hobart and stepped falls at a total height of 58 metres. Tasmania also has
2448-541: A jail sentence of 18 months in some states. It is also illegal to export a native Australian snake. Tasmania Tasmania ( / t æ z ˈ m eɪ n i ə / ; 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,
2584-516: A landmass of 68,401 km (26,410 sq mi) and is located directly in the pathway of the notorious " Roaring Forties " wind that encircles the globe. To its north, it is separated from mainland Australia by Bass Strait . Tasmania is the only Australian state that is not located on the Australian mainland. About 2,500 kilometres (1,300 nautical miles) south of Tasmania island lies the George V Coast of Antarctica . Depending on which borders of
2720-906: A large number of beaches , the longest of which is Ocean Beach on the West Coast at about 40 kilometres. Wineglass Bay in Freycinet on the east coast is a well-known landmark of the state. The Tasmanian temperate rainforests cover a few different types. These are also considered distinct from the more common wet sclerophyll forests, though these eucalypt forests often form with rainforest understorey and ferns (such as tree-ferns ) are usually never absent. Rainforest found in deep gullies are usually difficult to traverse due to dense understorey growth, such as from horizontal ( Anodopetalum biglandulosum ) . Higher-elevation forests (~500 to 800 m) have smaller ground vegetation and are thus easier to walk in. The most common rainforests usually have
2856-638: A large plateau which forms a number of ranges and escarpments on its north side, tapering off along the south, and radiating into the highest mountain ranges in the west. At the north-west of this, another plateau radiates into a system of hills where takayna / Tarkine is located. The Interim Biogeographic Regionalisation for Australia (IBRA) divides Tasmania into 9 bioregions: Ben Lomond , Furneaux , King , Central Highlands , Northern Midlands , Northern Slopes , Southern Ranges , South East , and West . Tasmania's environment consistes of many different biomes or communities across its different regions. It
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#17327869315922992-465: A lineage should be divided into multiple chronospecies , or when populations have diverged to have enough distinct character states to be described as cladistic species. Species and higher taxa were seen from the time of Aristotle until the 18th century as categories that could be arranged in a hierarchy, the great chain of being . In the 19th century, biologists grasped that species could evolve given sufficient time. Charles Darwin 's 1859 book On
3128-428: A means of suppressing the native threat – or even in some cases, exacting revenge. Van Diemen's Land had an enormous gender imbalance, with male colonists outnumbering females six to one in 1822—and 16 to one among the convict population. Historian Nicholas Clements has suggested the "voracious appetite" for native women was the most important trigger for the explosion of violence from the late 1820s. From 1825 to 1828,
3264-492: A misnomer, need to be reconciled, as they delimit species differently. Genetic introgression mediated by endosymbionts and other vectors can further make barcodes ineffective in the identification of species. A phylogenetic or cladistic species is "the smallest aggregation of populations (sexual) or lineages (asexual) diagnosable by a unique combination of character states in comparable individuals (semaphoronts)". The empirical basis – observed character states – provides
3400-616: A name for Cape Barren Island . In the 20th century, some writers used it as an Aboriginal name for Tasmania, spelled "Trowenna" or "Trowunna". It is now believed that the name is more properly applied to Cape Barren Island, which has had an official dual name of "Truwana" since 2014. A number of palawa kani names, based on historical records of aboriginal names, have been accepted by the Tasmanian government. A dozen of these (below) are 'dual-use' (bilingual) names, and another two are unbounded areas with only palawa names. There are also
3536-710: A number of archaeological sites with Palawa names. Some of these names have been contentious, with names being proposed without consultation with the aboriginal community, or without having a connection to the place in question. As well as a diverse First Nations geography, where remnants are preserved in rough form by European documentation, Tasmania is known as a place for unorthodox place-names . These names often come about from lost definitions, where descriptive names have lost their old meanings and have taken on new modern interpretations (e.g. 'Bobs Knobs'). Other names have retained their original meaning, and are often quaint or endearing descriptions (e.g. 'Paradise' ). The island
3672-449: A particular species, including which genus (and higher taxa) it is placed in, is a hypothesis about the evolutionary relationships and distinguishability of that group of organisms. As further information comes to hand, the hypothesis may be corroborated or refuted. Sometimes, especially in the past when communication was more difficult, taxonomists working in isolation have given two distinct names to individual organisms later identified as
3808-601: A party of 49, including 21 male and three female convicts, named the camp Risdon. Several months later, a second settlement was established by Captain David Collins , with 308 convicts, 5 kilometres (3.1 miles) to the south in Sullivans Cove on the western side of the Derwent, where fresh water was more plentiful. The latter settlement became known as Hobart Town or Hobarton, later shortened to Hobart , after
3944-400: A perfect model of life, it is still a useful tool to scientists and conservationists for studying life on Earth, regardless of the theoretical difficulties. If species were fixed and clearly distinct from one another, there would be no problem, but evolutionary processes cause species to change. This obliges taxonomists to decide, for example, when enough change has occurred to declare that
4080-525: A reputation as "Sanitorium of the South" and a health-focused tourist boom began to grow. The MS Princess of Tasmania began her maiden voyage in 1959, the first car ferry to Tasmania. As part of the boom, Tasmania allowed the opening of the first casino in Australia in 1968. Queen Elizabeth II visited the state in 1954, and the 50s and 60s were charactered by the opening of major public services, including
4216-400: A short way of saying that something applies to many species within a genus, but not to all. If scientists mean that something applies to all species within a genus, they use the genus name without the specific name or epithet. The names of genera and species are usually printed in italics . However, abbreviations such as "sp." should not be italicised. When a species' identity is not clear,
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4352-462: A significant dolerite exposure, though the western half of the state is older and more rugged, featuring buttongrass plains, temperate rainforests, and quartzite ranges, notably Federation Peak and Frenchmans Cap . The presence of these mountain ranges is a primary factor in the rain shadow effect , where the western half receives the majority of rainfall, which also influences the types of vegetation that can grow. The Central Highlands feature
4488-404: A specialist may use "cf." before the epithet to indicate that confirmation is required. The abbreviations "nr." (near) or "aff." (affine) may be used when the identity is unclear but when the species appears to be similar to the species mentioned after. With the rise of online databases, codes have been devised to provide identifiers for species that are already defined, including: The naming of
4624-523: A species as groups of actually or potentially interbreeding natural populations, which are reproductively isolated from other such groups. It has been argued that this definition is a natural consequence of the effect of sexual reproduction on the dynamics of natural selection. Mayr's use of the adjective "potentially" has been a point of debate; some interpretations exclude unusual or artificial matings that occur only in captivity, or that involve animals capable of mating but that do not normally do so in
4760-400: A species as determined by a taxonomist. A typological species is a group of organisms in which individuals conform to certain fixed properties (a type), so that even pre-literate people often recognise the same taxon as do modern taxonomists. The clusters of variations or phenotypes within specimens (such as longer or shorter tails) would differentiate the species. This method was used as
4896-491: A species. All species definitions assume that an organism acquires its genes from one or two parents very like the "daughter" organism, but that is not what happens in HGT. There is strong evidence of HGT between very dissimilar groups of prokaryotes , and at least occasionally between dissimilar groups of eukaryotes , including some crustaceans and echinoderms . The evolutionary biologist James Mallet concludes that there
5032-685: A species. Generally the term includes the unknown element of a distinct act of creation. Many authors have argued that a simple textbook definition, following Mayr's concept, works well for most multi-celled organisms , but breaks down in several situations: Species identification is made difficult by discordance between molecular and morphological investigations; these can be categorised as two types: (i) one morphology, multiple lineages (e.g. morphological convergence , cryptic species ) and (ii) one lineage, multiple morphologies (e.g. phenotypic plasticity , multiple life-cycle stages). In addition, horizontal gene transfer (HGT) makes it difficult to define
5168-528: A taxonomic decision at the discretion of cognizant specialists, is not governed by the Codes of Zoological or Botanical Nomenclature, in contrast to the PhyloCode , and contrary to what is done in several other fields, in which the definitions of technical terms, like geochronological units and geopolitical entities, are explicitly delimited. The nomenclatural codes that guide the naming of species, including
5304-517: A traditional biological species. The International Committee on Taxonomy of Viruses has since 1962 developed a universal taxonomic scheme for viruses; this has stabilised viral taxonomy. Most modern textbooks make use of Ernst Mayr 's 1942 definition, known as the Biological Species Concept as a basis for further discussion on the definition of species. It is also called a reproductive or isolation concept. This defines
5440-447: A variation on the morphological species concept, a phenetic species, defined as a set of organisms with a similar phenotype to each other, but a different phenotype from other sets of organisms. It differs from the morphological species concept in including a numerical measure of distance or similarity to cluster entities based on multivariate comparisons of a reasonably large number of phenotypic traits. A mate-recognition species
5576-515: A variety of reasons. Viruses are a special case, driven by a balance of mutation and selection , and can be treated as quasispecies . Biologists and taxonomists have made many attempts to define species, beginning from morphology and moving towards genetics . Early taxonomists such as Linnaeus had no option but to describe what they saw: this was later formalised as the typological or morphological species concept. Ernst Mayr emphasised reproductive isolation, but this, like other species concepts,
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5712-438: Is "an entity composed of organisms which maintains its identity from other such entities through time and over space, and which has its own independent evolutionary fate and historical tendencies". This differs from the biological species concept in embodying persistence over time. Wiley and Mayden stated that they see the evolutionary species concept as "identical" to Willi Hennig 's species-as-lineages concept, and asserted that
5848-400: Is a group of sexually reproducing organisms that recognise one another as potential mates. Expanding on this to allow for post-mating isolation, a cohesion species is the most inclusive population of individuals having the potential for phenotypic cohesion through intrinsic cohesion mechanisms; no matter whether populations can hybridise successfully, they are still distinct cohesion species if
5984-458: Is a set of organisms adapted to a particular set of resources, called a niche, in the environment. According to this concept, populations form the discrete phenetic clusters that we recognise as species because the ecological and evolutionary processes controlling how resources are divided up tend to produce those clusters. A genetic species as defined by Robert Baker and Robert Bradley is a set of genetically isolated interbreeding populations. This
6120-563: Is also the Australia Post abbreviation for the state. In the constructed palawa kani language, the main island of Tasmania is called lutruwita , a name originally derived from the Bruny Island Tasmanian language . George Augustus Robinson recorded it as Loe.trou.witter and also as Trow.wer.nar , probably from one or more of the eastern or Northeastern Tasmanian languages . However, he also recorded it as
6256-548: Is also the driest part of the state. Tasmania's insularity was possibly detected by Captain Abel Tasman when he charted Tasmania's coast in 1642. On 5 December, Tasman was following the east coast northward to see how far it went. When the land veered to the north-west at Eddystone Point , he tried to keep in with it but his ships were suddenly hit by the Roaring Forties howling through Bass Strait . Tasman
6392-414: Is called speciation . Charles Darwin was the first to describe the role of natural selection in speciation in his 1859 book The Origin of Species . Speciation depends on a measure of reproductive isolation , a reduced gene flow. This occurs most easily in allopatric speciation, where populations are separated geographically and can diverge gradually as mutations accumulate. Reproductive isolation
6528-403: Is described formally, in a publication that assigns it a unique scientific name. The description typically provides means for identifying the new species, which may not be based solely on morphology (see cryptic species ), differentiating it from other previously described and related or confusable species and provides a validly published name (in botany) or an available name (in zoology) when
6664-419: 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,
6800-558: Is found on the Central Plateau and the Southwest. Cradle Mountain , another dolerite peak, for example, was a nunatak . The combination of these different rock types contributes to scenery which is distinct from any other region of the world. In the far southwest corner of the state, the geology is almost wholly quartzite, which gives the mountains the false impression of having snow-capped peaks year round. Evidence indicates
6936-671: Is further weakened by the existence of microspecies , groups of organisms, including many plants, with very little genetic variability, usually forming species aggregates . For example, the dandelion Taraxacum officinale and the blackberry Rubus fruticosus are aggregates with many microspecies—perhaps 400 in the case of the blackberry and over 200 in the dandelion, complicated by hybridisation , apomixis and polyploidy , making gene flow between populations difficult to determine, and their taxonomy debatable. Species complexes occur in insects such as Heliconius butterflies, vertebrates such as Hypsiboas treefrogs, and fungi such as
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#17327869315927072-524: Is generally jet black, sometimes with white or cream markings around the lips and chin. On Kangaroo Island, specimens are highly variable in colour, often exhibiting banding and uniform brown colours. The ventral surface is dark grey to black, with some specimens on Kangaroo Island even possessing red bellies. The ventral surface becomes much lighter prior to shedding. Juveniles nearly always have banding. Midbody scales are in 17, 18, 19 and rarely 21 rows, ventrals number 160 to 184, subcaudals 45 to 54 (single) and
7208-726: Is hard or even impossible to test. Later biologists have tried to refine Mayr's definition with the recognition and cohesion concepts, among others. Many of the concepts are quite similar or overlap, so they are not easy to count: the biologist R. L. Mayden recorded about 24 concepts, and the philosopher of science John Wilkins counted 26. Wilkins further grouped the species concepts into seven basic kinds of concepts: (1) agamospecies for asexual organisms (2) biospecies for reproductively isolated sexual organisms (3) ecospecies based on ecological niches (4) evolutionary species based on lineage (5) genetic species based on gene pool (6) morphospecies based on form or phenotype and (7) taxonomic species,
7344-685: Is in the elapid family, venomous snakes with fixed front fangs. The classification of this genus is given as a single and highly variable species, Notechis scutatus , or a second species Notechis ater , and by an arrangement of subspecies or regional morphs. A 2016 genetic analysis showed that the closest relative of the tiger snakes is the rough-scaled snake ( Tropidechis carinatus ). The two extensively recognized species of this genus are Notechis scutatus (Peters, 1861) and Notechis ater (Krefft, 1866), which show further variety in their characteristics. Several authors have published revisions or described subspecies of these species. Others consider
7480-403: Is no easy way to tell whether related geographic or temporal forms belong to the same or different species. Species gaps can be verified only locally and at a point of time. One is forced to admit that Darwin's insight is correct: any local reality or integrity of species is greatly reduced over large geographic ranges and time periods. The botanist Brent Mishler argued that the species concept
7616-478: Is not valid, notably because gene flux decreases gradually rather than in discrete steps, which hampers objective delimitation of species. Indeed, complex and unstable patterns of gene flux have been observed in cichlid teleosts of the East African Great Lakes . Wilkins argued that "if we were being true to evolution and the consequent phylogenetic approach to taxa, we should replace it with
7752-615: Is olive, yellow, orange-brown, or jet-black, and the underside of the snake is light yellow or orange. Tiger snakes use venom to kill prey, and may also bite an aggressor; they are potentially fatal to humans. Tolerant of low temperatures, the snake may be active on warmer nights. When threatened, they flatten their bodies and raise their heads above the ground in a classic prestrike stance. The widely dispersed populations (sometimes referred as polymorphs ) show some conformity in their descriptions, but these characters may be shared by separate or adjacent groups. Tiger snakes are also identified by
7888-525: Is protected in some form of reserve. The first environmental political party in the world was founded in Tasmania. Tasmania is named after Dutch explorer Abel Tasman , who made the first reported European sighting of the island on 24 November 1642. Tasman named the island Anthony van Diemen's Land after his sponsor Anthony van Diemen , the Governor of the Dutch East Indies . The name
8024-586: Is similar to Mayr's Biological Species Concept, but stresses genetic rather than reproductive isolation. In the 21st century, a genetic species could be established by comparing DNA sequences. Earlier, other methods were available, such as comparing karyotypes (sets of chromosomes ) and allozymes ( enzyme variants). An evolutionarily significant unit (ESU) or "wildlife species" is a population of organisms considered distinct for purposes of conservation. In palaeontology , with only comparative anatomy (morphology) and histology from fossils as evidence,
8160-595: Is the Central Highlands area, which covers most of the central western parts of the state. The Midlands located in the central east, is fairly flat, and is predominantly used for agriculture, although farming activity is scattered throughout the state. Tasmania's tallest mountain is Mount Ossa at 1,617 m (5,305 ft). Much of Tasmania is still densely forested, with the Southwest National Park and neighbouring areas holding some of
8296-685: Is the most forested state in Australia, and preserves the country's largest areas of temperate rainforest . A distinctive type of moorland found across the west, and particularly south-west of Tasmania, are buttongrass plains, which are speculated to have been expanded by Tasmanian Aboriginal burning practices . Tasmania also features a diverse alpine garden environment , such as cushion plant . Highland areas receive consistent snowfall above ~1,000 metres every year, and due to cold air from Antarctica , this level often reaches 800 m, and more occasionally 600 or 400 metres. Every five or so years, snow can form at sea level. This environment gives rise to
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#17327869315928432-594: Is threatened by hybridisation, but this can be selected against once a pair of populations have incompatible alleles of the same gene, as described in the Bateson–Dobzhansky–Muller model . A different mechanism, phyletic speciation, involves one lineage gradually changing over time into a new and distinct form (a chronospecies ), without increasing the number of resultant species. Horizontal gene transfer between organisms of different species, either through hybridisation , antigenic shift , or reassortment ,
8568-515: Is usually a lighter colour. Midbody scales are in 19, 17 or sometimes 15 rows, ventrals number 161 to 174, subcaudals 48 to 52 (single) and the anal scale is single. Tasmanian tiger snakes tend to be quiet snakes, probably due to the lower temperature ranges they inhabit. The Peninsula tiger snake has a blunt head distinct from a robust body; it averages 1.1 m (3 ft 7 in) in length. Roxby Island specimens are much smaller, averaging 0.86 m (2 ft 10 in) in length. Dorsally, it
8704-553: The 1943 federal election and first female to serve in the federal cabinet . In May 1948, Margaret McIntyre achieved another milestone as the first female elected to the Parliament of Tasmania. Less than six months after her election, McIntyre died in the crash of the Lutana near Quirindi on 2 September 1948. After the end of World War II, the state saw major urbanisation, and the growth of towns like Ulverstone . It gained
8840-516: 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
8976-570: The British Colonial Secretary of the time, Lord Hobart . The settlement at Risdon was later abandoned. Left on their own without further supplies, the Sullivans Cove settlement suffered severe food shortages and by 1806 its inhabitants were starving, with many resorting to scraping seaweed off rocks and scavenging washed-up whale blubber from the shore to survive. A smaller colony was established at Port Dalrymple on
9112-463: The Furneaux Group of Bass Strait , King Island in the west of Bass Strait, Cape Barren Island south of Flinders Island, Bruny Island separated from Tasmania by the D'Entrecasteaux Channel , Macquarie Island 1,500 km from Tasmania, and Maria Island off the east coast. Tasmania features a number of separated and continuous mountain ranges. The majority of the state is defined by
9248-530: The ICZN for animals and the ICN for plants, do not make rules for defining the boundaries of the species. Research can change the boundaries, also known as circumscription, based on new evidence. Species may then need to be distinguished by the boundary definitions used, and in such cases the names may be qualified with sensu stricto ("in the narrow sense") to denote usage in the exact meaning given by an author such as
9384-762: The National Firearms Agreement . In 2000, Queen Elizabeth II once again visited the state. Gunns rose to prominence as a major forestry company during this decade, only to collapse in 2013. In 2004, Premier Jim Bacon died in office from lung cancer. In January 2011 philanthropist David Walsh opened the Museum of Old and New Art (MONA) in Hobart to international acclaim. Within 12 months, MONA became Tasmania's top tourism attraction. The COVID-19 pandemic in Tasmania resulted in at least 230 cases and 13 deaths as of September 2021 . In 2020, after
9520-643: The Tasmanian Wilderness World Heritage Area . The Franklin Dam was blocked by the federal government in 1983, and CSIRO opened its marine studies centre in Hobart. Pope John Paul II would hold mass at Elwick Racecourse in 1986. The 1990s were characterised by the fight for LGBT rights in Tasmania , culminating in the intervention of the United Nations Human Rights Committee in 1997 and
9656-596: The cypress forests of the Central Plateau and mountainous highlands. In particular, the Walls of Jerusalem with large areas of rare pencil pine , and its closest relative King Billy pine . On the West Coast Range and partially on Mount Field , Australia's only winter- deciduous plant, deciduous beech is found, which forms a carpet or krummholz , or very rarely a 4-metre tree. Tasmania features
9792-399: The fly agaric . Natural hybridisation presents a challenge to the concept of a reproductively isolated species, as fertile hybrids permit gene flow between two populations. For example, the carrion crow Corvus corone and the hooded crow Corvus cornix appear and are classified as separate species, yet they can hybridise where their geographical ranges overlap. A ring species is
9928-507: The jaguar ( Panthera onca ) of Latin America or the leopard ( Panthera pardus ) of Africa and Asia. In contrast, the scientific names of species are chosen to be unique and universal (except for some inter-code homonyms ); they are in two parts used together : the genus as in Puma , and the specific epithet as in concolor . A species is given a taxonomic name when a type specimen
10064-406: The "cynical species concept", and arguing that far from being cynical, it usefully leads to an empirical taxonomy for any given group, based on taxonomists' experience. Other biologists have gone further and argued that we should abandon species entirely, and refer to the "Least Inclusive Taxonomic Units" (LITUs), a view that would be coherent with current evolutionary theory. The species concept
10200-712: The British Empire. The colony suffered from economic fluctuations, but for the most part was prosperous, experiencing steady growth. With few external threats and strong trade links with the Empire, Tasmania enjoyed many fruitful periods in the late 19th century, becoming a world-centre of shipbuilding. It raised a local defence force that eventually played a significant role in the Second Boer War in South Africa, and Tasmanian soldiers in that conflict won
10336-482: The Central Highlands and flow out to the coast. Tasmania's major population centres are mainly situated around estuaries (some of which are named rivers). Tasmania is in the shape of a downward-facing triangle, likened to a shield, heart, or face. It consists of the main island as well as at least a thousand neighbouring islands within the state's jurisdiction. The largest of these are Flinders Island in
10472-626: The Origin of Species explained how species could arise by natural selection . That understanding was greatly extended in the 20th century through genetics and population ecology . Genetic variability arises from mutations and recombination , while organisms themselves are mobile, leading to geographical isolation and genetic drift with varying selection pressures . Genes can sometimes be exchanged between species by horizontal gene transfer ; new species can arise rapidly through hybridisation and polyploidy ; and species may become extinct for
10608-475: The Peninsula tiger snake as N. ater niger (Kinghorn 1921). Island populations of N. scutatus have evolved larger heads to cope with large prey animals. Young populations have larger heads by phenotypic plasticity , whereas large heads have become genetically assimilated in older populations. * Not including the nominate subspecies (typical form). Notechis is a genus of large venomous snakes in
10744-687: The Settled Districts to join a massive drive to sweep Aboriginal people out of the region and on to the Tasman Peninsula . The campaign failed and was abandoned seven weeks later, but by then Tasmania's Aboriginal population had fallen to about 300. After hostilities between settlers and Aboriginal peoples ceased in 1832, almost all of the remnants of the Indigenous population were persuaded by government agent George Augustus Robinson to move to Flinders Island . Many quickly succumbed to infectious diseases to which they had no immunity, reducing
10880-678: The Tamar River in the island's north in October 1804 and several other convict-based settlements were established, including the particularly harsh penal colonies at Port Arthur in the southeast and Macquarie Harbour on the West Coast. Tasmania was eventually sent 75,000 convicts—four out of every ten people transported to Australia. By 1819, the Aboriginal and British population reached parity with about 5000 of each, although among
11016-613: The Tasmanian Housing Department and Metro Tasmania public bus services. A jail was opened at Risdon in 1960, and the State Library of Tasmania the same year. The University of Tasmania also moved to its present location in 1963. The state was badly affected by the 1967 Tasmanian fires , killing 64 people and destroying over 652,000 acres in five hours. In 1975 the Tasman Bridge collapsed when
11152-405: The abbreviation "sp." in the singular or "spp." (standing for species pluralis , Latin for "multiple species") in the plural in place of the specific name or epithet (e.g. Canis sp.). This commonly occurs when authors are confident that some individuals belong to a particular genus but are not sure to which exact species they belong, as is common in paleontology . Authors may also use "spp." as
11288-570: The amount of hybridisation is insufficient to completely mix their respective gene pools . A further development of the recognition concept is provided by the biosemiotic concept of species. In microbiology , genes can move freely even between distantly related bacteria, possibly extending to the whole bacterial domain. As a rule of thumb, microbiologists have assumed that members of Bacteria or Archaea with 16S ribosomal RNA gene sequences more similar than 97% to each other need to be checked by DNA–DNA hybridisation to decide if they belong to
11424-465: The anal scale is single (rarely divided). The Chappell Island tiger snake has a blunt head distinct from a robust body. The giant of the tiger snakes species , it averages 1.9 m (over 6 ft) in length. Dorsally, its colour is olive-brown to almost black, sometimes with lighter crossbands. The ventral surface is usually lighter in colour. Juveniles are banded. Mid-body scales are in 17 rows; ventrals number 160 to 171, subcaudals 47 to 52 (single), and
11560-404: The anal scale is single. The subspecies Notechis ater ater , found away from mainland Australia, is typically uniformly black. As with most snakes, the colours vary widely between individuals and are an unreliable means of identifying subspecies. Accurate identification is best performed with a venom test kit or scale count. Tiger snakes give birth to 20 to 30 live young; an exceptional record
11696-454: The anal scale is single. These snakes are quite docile. The King Island and Tasmanian tiger snakes each have a blunt head distinct from a robust body. Younger snakes may be slimmer and similar to other tiger snakes, eventually growing up to 1.5 m (4 ft 11 in) in length. Dorsally, they may be jet black, jet black with lighter crossbands, grey with black flecks forming faint bands, or an unbanded grey or brown. The ventral surface
11832-583: The arrival of 600 colonists from Norfolk Island between 1807 and 1813. They established farms along the River Derwent and east and west of Launceston , occupying ten percent of Van Diemen's Land. By 1824 the colonial population had swelled to 12,600, while the island's sheep population had reached 200,000. The rapid colonisation transformed traditional kangaroo hunting grounds into farms with grazing livestock as well as fences, hedges and stone walls, while police and military patrols were increased to control
11968-474: The biological species concept, "the several versions" of the phylogenetic species concept, and the idea that species are of the same kind as higher taxa are not suitable for biodiversity studies (with the intention of estimating the number of species accurately). They further suggested that the concept works for both asexual and sexually-reproducing species. A version of the concept is Kevin de Queiroz 's "General Lineage Concept of Species". An ecological species
12104-505: The biological species concept, a cladistic species does not rely on reproductive isolation – its criteria are independent of processes that are integral in other concepts. Therefore, it applies to asexual lineages. However, it does not always provide clear cut and intuitively satisfying boundaries between taxa, and may require multiple sources of evidence, such as more than one polymorphic locus, to give plausible results. An evolutionary species, suggested by George Gaylord Simpson in 1951,
12240-428: The boundaries between closely related species become unclear with hybridisation , in a species complex of hundreds of similar microspecies , and in a ring species . Also, among organisms that reproduce only asexually , the concept of a reproductive species breaks down, and each clone is potentially a microspecies. Although none of these are entirely satisfactory definitions, and while the concept of species may not be
12376-555: The bridge was struck by the bulk ore carrier Lake Illawarra . It was the only bridge in Hobart, and made crossing the Derwent River by road at the city impossible. The nearest bridge was approximately 20 kilometres (12 mi) to the north, at Bridgewater. Throughout the 1980s, strong environmental concerns saw the building of the Australian Antarctic Division headquarters, and the proclamation of
12512-417: The burgeoning society of free settlers from the island's convict past. The Legislative Council of Van Diemen's Land drafted a new constitution which gained Royal Assent in 1855. The Privy Council also approved the colony changing its name from "Van Diemen's Land" to "Tasmania", and in 1856 the newly elected bicameral parliament sat for the first time, establishing Tasmania as a self-governing colony of
12648-527: The colonists men outnumbered women four-to-one. Free settlers began arriving in large numbers from 1820, lured by the promise of land grants and free convict labour. Settlement in the island's northwest corner was monopolised by the Van Diemen's Land Company , which sent its first surveyors to the district in 1826. By 1830, one-third of Australia's non-Indigenous population lived in Van Diemen's Land and
12784-433: The concept of a chronospecies can be applied. During anagenesis (evolution, not necessarily involving branching), some palaeontologists seek to identify a sequence of species, each one derived from the phyletically extinct one before through continuous, slow and more or less uniform change. In such a time sequence, some palaeontologists assess how much change is required for a morphologically distinct form to be considered
12920-407: The convict farm labourers. Violence began to spiral rapidly from the mid-1820s in what became described as the " Black War ". Aboriginal inhabitants were driven to desperation by hunger – that included a desire for agricultural produce, as well as feeling anger at the prevalence of abductions of women and girls. New settlers motivated by fear carried out self-defence operations as well as attacks as
13056-594: The decriminalization of homosexuality that year. Christine Milne became the first female leader of a Tasmanian political party in 1993, and major council amalgamations reduce the number of councils from 46 to 29. Following the Port Arthur massacre on 28 April 1996, which resulted in the loss of 35 lives and injured 21 others, the Australian Government conducted a review of its firearms policies and enacted new nationwide gun ownership laws under
13192-435: The evidence to support hypotheses about evolutionarily divergent lineages that have maintained their hereditary integrity through time and space. Molecular markers may be used to determine diagnostic genetic differences in the nuclear or mitochondrial DNA of various species. For example, in a study done on fungi , studying the nucleotide characters using cladistic species produced the most accurate results in recognising
13328-461: The family Elapidae restricted to subtropical and temperate regions of Australia. Tiger snakes are a large group of distinct populations, which may be isolated or overlapping, with extreme variance in size and colour. Individuals also show seasonal variation in colour. The total length is typically about 1.2 metres (3 ft 11 in) The patterning is darker bands, strongly contrasting or indistinct, which are pale to very dark in colour. Colouration
13464-405: The first completely electrified city on the island in 1885, followed closely by the township of Zeehan in 1900. The state economy was riding mining prosperity until World War I. In 1901, the state population was 172,475. The 1910 foundation of what would become Hydro Tasmania began to shape urban patterns, as well as future major damming programs. Hydro's influence culminated in the 1970s when
13600-481: The first time that Tasmania was an island. Sealers and whalers based themselves on Tasmania's islands from 1798, and in August 1803 New South Wales Governor Philip King sent Lieutenant John Bowen to establish a small military outpost on the eastern shore of the Derwent River in order to forestall any claims to the island by French explorers who had been exploring the southern Australian coastline. Bowen, who led
13736-611: The first two Victoria Crosses awarded to Australians. In 1901, the Colony of Tasmania united with the five other Australian colonies to form the Commonwealth of Australia. Tasmanians voted in favour of federation with the largest majority of all the Australian colonies. Tasmania was an early adopter of electric street lighting . Australia's first electric street lights were switched on in Waratah in 1886. Launceston became
13872-595: The genocide thesis, arguing that the colonial authorities did not intend to destroy the Aboriginal population in whole or in part. Boyce has claimed that the April 1828 "Proclamation Separating the Aborigines from the White Inhabitants" sanctioned force against Aboriginal people "for no other reason than that they were Aboriginal". However, as Reynolds, Broome and Clements point out, there was open warfare at
14008-415: The incidence of fatal tiger snake bites. Among the number of deaths caused by snakebite in Australia , those from tiger snakes are exceeded only by the brown snake . The venom yield is 35–65 milligrams (0.54–1.00 gr), while the lethal dose for humans is 3 milligrams (0.046 gr). They are protected species in most Australian states, and to kill or injure one incurs a fine up to A$ 7,500 , as well as
14144-473: The island accounted for about half of all land under cultivation and exports. Tensions between Tasmania's Aboriginal and white inhabitants rose, partly driven by increasing competition for kangaroo and other game. Explorer and naval officer John Oxley in 1810 noted the "many atrocious cruelties" inflicted on Aboriginal people by convict bushrangers in the north, which in turn led to black attacks on solitary white hunters. Hostilities increased further with
14280-514: 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
14416-404: The island's nine nations; Nicholas Clements, citing research by N.J.B. Plomley and Rhys Jones , settled on a figure of 3,000 to 4,000. They engaged in fire-stick farming , hunted game including kangaroo and wallabies , caught seals, mutton-birds, shellfish and fish and lived as nine separate "nations" on the island, which they knew as "Trouwunna". The first reported sighting of Tasmania by
14552-534: The last temperate rain forests in the Southern Hemisphere . The Tarkine , containing Savage River National Park located in the island's far north west, is the largest temperate rainforest area in Australia covering about 3,800 square kilometres (1,500 sq mi). With its rugged topography, Tasmania has a great number of rivers. Several of Tasmania's largest rivers have been dammed at some point to provide hydroelectricity . Many rivers begin in
14688-441: The lymphatic system. Broad, thick bandages are applied over the bite, then down and back along the limb to the armpit or groin. The affected limb is then immobilized with a splint. Identification of the venom is possible if traces are left near the wound. Identifying the snake is not necessary if bitten in Tasmania, because the same antivenom is used to treat all Tasmanian snakes' bites. The availability of antivenom has greatly reduced
14824-582: The names contained by this taxonomic arrangement to be unwarranted, and describe Notechis as a monotypic genus. Various authorities accept some or all the systematics previously applied, but most agree a revision of the genus is needed. Names for these subdivisions include the western types, appended to both species names as occidentalis (Glauert 1948) The island groups have also been described as subspecies: Chappell Island tiger snake as N. ater serventyi (Warrell, 1963), King Island and Tasmanian tiger snakes subspecies as N. ater humphreysi , (Warrell, 1963) and
14960-500: The neck. Ventral scales number 140 to 190, subcaudals 35 to 65, mid-body in 17 or 19 rows and the anal scale is single. The western tiger snake head is distinct from its robust body, and grows to 2 m (6 ft 7 in) in length. Dorsally, it is steel-blue to black in color with bright yellow bands; unbanded specimens occur. The ventral surface is yellow, tending black towards the tail. Midbody scales are in 17 or 19 rows, ventrals number 140 to 165, subcaudals 36 to 51 (single) and
15096-471: The northeast and east, continental granites can be seen, such as at Freycinet, similar to coastal granites on mainland Australia. In the northwest and west, mineral-rich volcanic rock can be seen at Mount Read near Rosebery , or at Mount Lyell near Queenstown . Also present in the south and northwest is limestone with caves. The quartzite and dolerite areas in the higher mountains show evidence of glaciation , and much of Australia's glaciated landscape
15232-830: The northernmost point on mainland Tasmania is approximately 40°38′26″S 144°43′33″E / 40.64056°S 144.72583°E / -40.64056; 144.72583 in Woolnorth / Temdudheker near Cape Grim / Kennaook . Tasmania lies at similar latitudes to Te Waipounamu / South Island of New Zealand and parts of Patagonia in South America. Areas at equivalent latitudes in the Northern Hemisphere include Hokkaido in Japan, Northeast China ( Manchuria ), Central Italy , and United States cities such as New York and Chicago . The most mountainous region
15368-506: The number of native attacks more than doubled each year, raising panic among settlers. Over the summer of 1826–1827 clans from the Big River, Oyster Bay and North Midlands nations speared stock-keepers on farms and made it clear that they wanted the settlers and their sheep and cattle to move from their kangaroo hunting grounds. Settlers responded vigorously, resulting in many mass-killings. In November 1826, Governor Sir George Arthur issued
15504-483: The numerous fungi species of all the concepts studied. Versions of the phylogenetic species concept that emphasise monophyly or diagnosability may lead to splitting of existing species, for example in Bovidae , by recognising old subspecies as species, despite the fact that there are no reproductive barriers, and populations may intergrade morphologically. Others have called this approach taxonomic inflation , diluting
15640-811: The oceans are used, the island can be said to be either surrounded by the Southern Ocean, or to have the Pacific on its east and the Indian to its west. Still other definitions of the ocean boundaries would have Tasmania with the Great Australian Bight to the west, and the Tasman Sea to the east. The southernmost point on mainland Tasmania is approximately 43°38′37″S 146°49′38″E / 43.64361°S 146.82722°E / -43.64361; 146.82722 at South East Cape , and
15776-597: The outbreak of the coronavirus pandemic ( SARS-CoV-2 ) and its spread to Australia, the Tasmanian government issued a public health emergency on 17 March, the following month receiving the state's most significant outbreak from the North-West which required assistance from the Federal government . In late 2021, Tasmania was leading the nationwide vaccination response. Tasmania, the largest island of Australia, has
15912-593: The paper is accepted for publication. The type material is usually held in a permanent repository, often the research collection of a major museum or university, that allows independent verification and the means to compare specimens. Describers of new species are asked to choose names that, in the words of the International Code of Zoological Nomenclature , are "appropriate, compact, euphonious, memorable, and do not cause offence". Books and articles sometimes intentionally do not identify species fully, using
16048-674: The person who named the species, while the antonym sensu lato ("in the broad sense") denotes a wider usage, for instance including other subspecies. Other abbreviations such as "auct." ("author"), and qualifiers such as "non" ("not") may be used to further clarify the sense in which the specified authors delineated or described the species. Species are subject to change, whether by evolving into new species, exchanging genes with other species, merging with other species or by becoming extinct. The evolutionary process by which biological populations of sexually-reproducing organisms evolve to become distinct or reproductively isolated as species
16184-400: The population further. Of those removed from Tasmania, the last to die was Truganini , in 1876. The near-destruction of Tasmania's Aboriginal population has been described as an act of genocide by historians including Robert Hughes , James Boyce , Lyndall Ryan and Tom Lawson. However, other historians including Henry Reynolds , Richard Broome and Nicholas Clements do not agree with
16320-592: The presence of Aboriginal people in Tasmania about 42,000 years ago. Rising sea levels cut Tasmania off from mainland Australia about 10,000 years ago and by the time of European contact, the Aboriginal people in Tasmania had nine major nations or ethnic groups. At the time of the British occupation and colonisation in 1803, the indigenous population was estimated at between 3,000 and 10,000. Historian Lyndall Ryan's analysis of population studies led her to conclude that there were about 7,000 spread throughout
16456-675: The region or island in which the forms occur, which is prefixed to a common name. The common tiger snake has a flat, blunt head, slightly distinct from a robust body. Its body is capable of being flattened along its entire length when the snake is agitated or basking. Its average length is 0.9 m (2 ft 11 in), with a maximum length of 1.2 m (3 ft 11 in), but has been recorded at 2 m (6 ft 7 in). Highly variable in colour, its base colours are brown, grey olive, or green with lighter crossbands usually of creamy yellow. Occasionally, unbanded specimens are found. Scales appear like overlapping shields, especially around
16592-487: The result of misclassification leading to questions on whether there really are any ring species. The commonly used names for kinds of organisms are often ambiguous: "cat" could mean the domestic cat, Felis catus , or the cat family, Felidae . Another problem with common names is that they often vary from place to place, so that puma, cougar, catamount, panther, painter and mountain lion all mean Puma concolor in various parts of America, while "panther" may also mean
16728-586: The ring. Ring species thus present a difficulty for any species concept that relies on reproductive isolation. However, ring species are at best rare. Proposed examples include the herring gull – lesser black-backed gull complex around the North pole, the Ensatina eschscholtzii group of 19 populations of salamanders in America, and the greenish warbler in Asia, but many so-called ring species have turned out to be
16864-508: The same species. This concept was narrowed in 2006 to a similarity of 98.7%. The average nucleotide identity (ANI) method quantifies genetic distance between entire genomes , using regions of about 10,000 base pairs . With enough data from genomes of one genus, algorithms can be used to categorize species, as for Pseudomonas avellanae in 2013, and for all sequenced bacteria and archaea since 2020. Observed ANI values among sequences appear to have an "ANI gap" at 85–95%, suggesting that
17000-529: The same species. When two species names are discovered to apply to the same species, the older species name is given priority and usually retained, and the newer name considered as a junior synonym, a process called synonymy . Dividing a taxon into multiple, often new, taxa is called splitting . Taxonomists are often referred to as "lumpers" or "splitters" by their colleagues, depending on their personal approach to recognising differences or commonalities between organisms. The circumscription of taxa, considered
17136-450: The south of Western Australia through to South Australia , Tasmania , up through Victoria , and New South Wales . Its common habitat includes the coastal areas of Australia. Tiger snakes accounted for 17% of identified snakebite victims in Australia between 2005 and 2015, with four deaths recorded from 119 confirmed envenomations. Tiger snake venoms possess potent neurotoxins , coagulants , haemolysins , and myotoxins . Symptoms of
17272-530: The southeast portions of the island are mostly dolerites. Mount Wellington above Hobart is a good example, showing distinct columns known as the Organ Pipes. In the southern midlands as far south as Hobart, the dolerite is underlaid by sandstone and similar sedimentary stones. In the southwest, Precambrian quartzites were formed from very ancient sea sediments and form strikingly sharp ridges and ranges, such as Federation Peak or Frenchmans Cap . In
17408-506: The species concept and making taxonomy unstable. Yet others defend this approach, considering "taxonomic inflation" pejorative and labelling the opposing view as "taxonomic conservatism"; claiming it is politically expedient to split species and recognise smaller populations at the species level, because this means they can more easily be included as endangered in the IUCN red list and can attract conservation legislation and funding. Unlike
17544-603: The state government announced plans to flood environmentally significant Lake Pedder . As a result of the eventual flooding of Lake Pedder, the world's first green party was established; the United Tasmania Group . National and international attention surrounded the campaign against the Franklin Dam in the early 1980s. Tasmanian Enid Lyons became the first female member of the House of Representatives at
17680-461: The time. Boyce described the decision to remove all Tasmanian Aboriginal people after 1832—by which time they had given up their fight against white colonists—as an extreme policy position. He concluded: "The colonial government from 1832 to 1838 ethnically cleansed the western half of Van Diemen's Land." Nevertheless, Clements and Flood note that there was another wave of violence in north-west Tasmania in 1841, involving attacks on settlers' huts by
17816-540: The wild. It is difficult to define a species in a way that applies to all organisms. The debate about species concepts is called the species problem. The problem was recognised even in 1859, when Darwin wrote in On the Origin of Species : I was much struck how entirely vague and arbitrary is the distinction between species and varieties. He went on to write: No one definition has satisfied all naturalists; yet every naturalist knows vaguely what he means when he speaks of
17952-419: Was adjoined to the mainland of Australia until the end of the last glacial period about 11,700 years ago. Much of the island is composed of Jurassic dolerite intrusions (the upwelling of magma ) through other rock types, sometimes forming large columnar joints. Tasmania has the world's largest areas of dolerite, with many distinctive mountains and cliffs formed from this rock type. The central plateau and
18088-623: 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
18224-550: Was later shortened to Van Diemen's Land by the British. It was officially renamed Tasmania in honour of its first European discoverer on 1 January 1856. Tasmania was sometimes referred to as "Dervon", as mentioned in the Jerilderie Letter written by the notorious Australian bushranger Ned Kelly in 1879. The colloquial expression for the state is "Tassie". Tasmania is also colloquially shortened to "Tas", mainly when used in business names and website addresses. TAS
18360-453: Was made of 64 from an eastern female. They usually mate in spring when it is in the warmer seasons and will give birth to live young in summer. Tiger snakes are usually found in coastal regions, where they favour wetlands, creeks, dams, and other habitat around watercourses, or at shelter near permanent sources of water in pastoral areas. Habitat providing an abundance of prey can support large populations. The species' distribution extends from
18496-487: Was on a mission to find the Southern Continent , not more islands, so he abruptly turned away to the east and continued his continent-hunting. Species A species ( pl. : species) is a population of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring , typically by sexual reproduction . It is the basic unit of classification and
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