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Australia is a megadiverse country with a large variety of animals. It is home to an extraordinarily high number of plant and animal species, with estimates ranging from 147,579 to 566,398 species. The country has a high level of endemism, meaning many of its species cannot be found anywhere else in the world. This diversity is due to the continent's long geographic isolation, tectonic stability, and unique patterns of climate change affecting its soil and flora over time. The settlement of Australia by Indigenous Australians between 48,000 and 70,000 years ago and by Europeans from 1788 has significantly impacted the fauna. Hunting, the introduction of non-native species, and land management practices have led to numerous extinctions, and many species remain under threat.
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![Census of the Genera of Plants Hitherto Known as Indigenous to Australia / F. Von Mueller 1882 [Leather Bound]](https://m.media-amazon.com/images/I/617DLHXyzlL._AC_UY218_.jpg)
What You'll Learn
Australia is a megadiverse country, with a high number of endemic species
The country's fauna consists of a large variety of animals, including marsupials such as kangaroos, koalas, possums, and wallabies, as well as monotremes like the platypus. Australia also has numerous venomous species, including snakes, spiders, scorpions, octopuses, jellyfish, molluscs, stonefish, and stingrays.
Since the European settlement of Australia, hundreds of species have become extinct, and many more are currently at risk. The introduction of non-native species, unsustainable hunting practices, habitat destruction, and land-management activities have all contributed to this loss. Currently, about 380 animal species are classified as either endangered or threatened, and conservation efforts are in place to protect them.
The Australian government has recently committed to a target of zero new extinctions, aiming to overhaul environmental laws to better protect the country's diverse wildlife. This includes the work of organizations like the Australian Wildlife Conservancy, which owns 4.8 million hectares of land dedicated to protecting endangered species. Australia's megadiverse status highlights the importance of conservation efforts to protect the planet's biodiversity.
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The impact of human settlement on the animal population
Australia is home to a large variety of animals, with some 46% of birds, 69% of mammals, 94% of amphibians, and 93% of reptiles endemic to the continent. The continent's long geographic isolation, tectonic stability, and unique patterns of climate change have contributed to this high level of endemism.
However, human settlement has significantly impacted the animal population in Australia. The settlement of Australia by Indigenous Australians between 48,000 and 70,000 years ago and by Europeans from 1788 has led to numerous extinctions and ecological changes. Hunting practices, the introduction of non-native species, and land-management activities involving habitat modification or destruction have all contributed to these ecological shifts.
Indigenous Australians' hunting and burning practices had a notable impact on animal numbers, but they also maintained a balance through a system of social prohibitions that protected important species. The introduction of non-native species by Europeans, such as rabbits, foxes, cats, and camels, inflicted massive damage, especially to small- to medium-sized mammals. Widespread land clearing for agriculture and urban development, mining, and timber harvesting further altered the landscape and disrupted Indigenous fire management practices.
Since European settlement, direct exploitation of native fauna, habitat destruction, and the introduction of exotic predators and competitive herbivores have led to the extinction of numerous mammal, bird, and frog species. The federal Environment Protection and Biodiversity Conservation Act 1999 was created to protect native fauna and identify and safeguard threatened species. Despite these efforts, unsustainable land use continues to threaten the survival of many species.
The increasing human population and expansion of urbanization in Australia have significantly impacted natural ecosystems and native fauna. Wildlife Rehabilitation Centres (WRC) play a crucial role in gathering data and monitoring wildlife health, but large-scale longitudinal studies on the specific threats facing native fauna are limited. Conservation management relies on precise information about wildlife population decline, and proactive measures are urgently needed to address the negative consequences of human activities on ecosystems and wildlife.
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The role of Aboriginal people in causing the extinction of fauna
The role of Aboriginal people in causing the extinction of Australia's fauna has been a subject of much debate. It is believed that the Aboriginal people settled in Australia between 48,000 and 70,000 years ago, and their hunting practices and land-management techniques have had a significant impact on the country's native species populations.
Some researchers argue that Aboriginal hunting and the use of fire to manage their environment may have contributed to the extinction of Australia's megafauna. The megafauna refers to the large animals that inhabited Australia during the Pleistocene Epoch, many of which became extinct during the latter half of this period. It is hypothesized that through sustained burning, the Aboriginal people wiped out fire-sensitive "dry rainforests", replacing them with flammable eucalypts and spinifex grasslands. This drastic transformation of the landscape is believed to have driven the megafauna to extinction.
However, the relationship between the early Aboriginal people and the megafauna is complex and not yet fully understood. Some evidence suggests that the megafauna lived alongside humans for several thousand years, and Aboriginal Dreamtime stories often feature monsters and large animals that resemble extinct megafauna. Additionally, genomic research indicates that Aboriginal populations may not have been significantly large until much later in prehistory, which could suggest that other factors, such as climate change, played a more significant role in the extinction of the megafauna.
The debate around the role of Aboriginal people in causing the extinction of fauna is ongoing, and it is important to recognize that the impact of European settlers on Australia's fauna has been much more significant and devastating. Since their arrival in 1788, direct exploitation of native fauna, habitat destruction, and the introduction of exotic predators have led to the extinction of numerous mammal, bird, and frog species.
In conclusion, while Aboriginal hunting and land-management practices may have contributed to the extinction of some fauna in Australia, particularly the megafauna, the impact of European settlement on the country's fauna has been far more substantial and destructive. The complex relationship between the early Aboriginal people and the megafauna is still being unraveled, and further research is needed to fully understand the role of human and climatic factors in the extinction of Australia's unique fauna.
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Conservation efforts to protect endangered species
Australia is one of the most important nations on Earth for biodiversity, being one of only 17 'megadiverse' nations and home to more species than any other developed country. However, since European settlement, hundreds of species have become extinct, and today, nearly one in three of Australia's unique mammal species are at risk of extinction. This is largely due to the introduction of non-native species, habitat destruction, and unsustainable land use.
The Australian government has taken steps to protect its endangered species through legislation such as the Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act). This Act protects native fauna and provides for the identification and protection of threatened species. As of March 2021, 100 of Australia's endemic species have been declared extinct or extinct in the wild since European colonisation in 1788. The EPBC Act has helped identify and protect numerous other species, with 380 animal species currently classified as either endangered or threatened.
Conservation organisations such as WWF-Australia, The Nature Conservancy Australia, and the Australian Wildlife Conservancy are actively working to protect endangered species. WWF-Australia is working with Indigenous ranger groups to identify the biodiversity benefits of different burning regimes and reduce threats to species such as the Black-footed rock-wallaby and the Brush-tailed phascogale. The Nature Conservancy Australia is supporting projects such as cool-season burning across northern Australia to improve the chances of survival for species like the Purple-crowned Fairy-wren. The Australian Wildlife Conservancy, the largest private owner of land for conservation in the country, is dedicated to protecting endangered species across 4.8 million hectares of land.
Other conservation efforts include the translocation of the Black-flanked Rock-wallaby within the Western Desert to increase its population size and spread, and the reintroduction of the Bass Strait Island wombat to an Indigenous-owned island in the Bass Strait. Additionally, the Eastern Quoll is finding refuge on some offshore, toad-free islands, and the rewilding of platypus populations in Sydney's Royal National Park is being supported through collaboration between UNSW's Platypus Conservation Initiative, Taronga Conservation Society Australia, and NSW National Parks and Wildlife Service.
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Australia's venomous species
Australia's reputation as a haven for venomous creatures is well-known. The country has a diverse range of venomous species, including the platypus, spiders, scorpions, octopus, jellyfish, molluscs, stonefish, and stingrays. While it is true that Australia is home to some of the world's deadliest creatures, it is important to note that encounters with these venomous animals are incredibly rare.
One of the most iconic venomous species in Australia is the Sydney funnel-web spider, known for its highly toxic bite that can kill a child in just 15 minutes. The male Sydney funnel-web spider is believed to have caused 13 fatalities, but no deaths have been recorded since the introduction of antivenom in 1981. Another deadly spider species in Australia is the redback widow spider, which can also deliver a fatal bite.
Coastal taipans, found along the coast from northern New South Wales to northern Western Australia, possess the longest fangs among Australian snakes, reaching up to 12mm in length. Their venom is the third most toxic of any land snake globally, containing neurotoxins, haemotoxins, and myotoxins. Fortunately, since the development of antivenom in 1956, there have been no reported deaths from coastal taipan bites.
In addition to spiders and snakes, Australia is also home to venomous marine creatures, such as the blue-ringed octopus. Despite its small size, the blue-ringed octopus has an LD50 rating of 0.3 for some elements of its venom, indicating high toxicity. Its bite can induce muscle weakness, breathing difficulties, and paralysis within 10 minutes, and death can occur rapidly without swift CPR.
The stonefish is another highly venomous marine species found in Australian waters. Its venom is extremely potent and can cause severe pain, swelling, and even death if untreated. Stonefish venom can affect the nervous system, causing paralysis and respiratory failure.
In conclusion, while Australia is indeed home to a diverse range of venomous species, the development of effective antivenoms and the rarity of encounters with these creatures mean that fatalities are relatively uncommon.
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Frequently asked questions
It is estimated that Australia is home to between 200,000 and 300,000 animal species, about 96% of which are invertebrates.
The settlement of Australia by Indigenous Australians between 48,000 and 70,000 years ago and by Europeans from 1788 has significantly affected the fauna. Hunting, the introduction of non-native species, and land-management practices involving the modification or destruction of habitats have led to numerous extinctions.
Australia is one of the most important nations for biodiversity and is home to many unique animal species. Some examples include the koala, kangaroo, dingo, platypus, echidna, Tasmanian devil, and lyrebird.
Yes, there are several endangered animal species in Australia. Some examples include the numbat, black-flanked rock-wallaby, Tasmanian devil, and purple-crowned fairy-wren. Human activities such as habitat destruction, introduced predators, and unsustainable land use practices continue to threaten the survival of many species.
