Leslie Massey
Australia's deserts are home to a rich diversity of lizard fauna, with over 210 species of reptiles, including the vulnerable great desert skink and the infamous desert death adder snake. The desert covers about three-quarters of the continent, yet only about 3% of the population, or around 800,000 people, live in this arid zone. This includes many Aboriginal communities, such as the Kogara, the Mirning, the Pitjantjatjara, and the Pintupi people, who were among the last groups to make contact with modern Australia in 1984. The Spinifex people, who lived in the desert until the 1950s, were expelled from their lands due to nuclear weapons testing. The Aboriginal people of Australia's deserts have a rich cultural heritage, with unique languages, art forms, and survival techniques adapted to the harsh and fluctuating climate.
| Characteristics | Values |
|---|---|
| Population | About 800,000 people (around 3-5% of the Australian population) |
| Indigenous Communities | Approximately 1,200 small communities |
| Indigenous Groups | Kogara, Mirning, Pitjantjatjara, Pintupi, Wangkangurru, Mandilara, Martu, etc. |
| Indigenous Languages | Arrernte, Warlpiri, Yankunytjatjara, Luritja, Ngaatjatjarra, Ngaanyatjarra, Alyawarra, Anmatyerre, etc. |
| Fauna | Lizards (over 210 species), great desert skink, central ranges taipan, sandhill dunnart, crest-tailed mulgara, southern marsupial mole, water-holding frog, woma python, thorny devil, bearded dragon, monitor lizard, frilled dragon, geckos, desert death adder snake, etc. |
| Flora | Spinifex grasses, Triodia pungens, Triodia basedowii, mulga bushes (Acacia aneura), acacia species, etc. |
| Climate | Fluctuating; droughts and flooding rains |
| Temperature | Average summer days above 35°C, with occasional hot spells above 40°C |
| Geography | Covering about 18-20% of Australia's mainland, including the Great Victoria Desert, Gibson Desert, Little Sandy Desert, Strzelecki Desert, Great Sandy Desert, Simpson Desert, Sturt Stony Desert, etc. |
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What You'll Learn
Aboriginal Australians and their history in the desert regions
Aboriginal Australians have a long and rich history in the desert regions of the country, with evidence suggesting their presence in these areas for thousands of years. The deserts cover about three-quarters of the Australian continent, and while they only support around 800,000 residents, there are also approximately 1,200 small Indigenous communities, many of which are Aboriginal settlements.
The Aboriginal people of Australia's deserts have a diverse range of cultures and languages, and they have adapted ingeniously to the harsh environment. For example, the Pintupi Nine, a group of nine Aboriginal people of the Pintupi tribe, lived a nomadic hunter-gatherer lifestyle in the Gibson Desert until 1984, when they first encountered white people and modern life. They survived by walking from one waterhole to another in the relentless heat, sleeping on the ground without blankets, and their excellent health was noted by doctors upon their emergence from the desert.
The Spinifex people are another example of a group of Aboriginal Australians who lived in isolation in the desert until the 1950s when they were expelled from their tribal lands due to nuclear weapons testing by the British and Australian governments.
Today, about a third of Australia's deserts are Aboriginal lands, with a large part managed by them as a nature reserve. The Aboriginal people of these regions continue to maintain and develop their unique cultures, with many important artists hailing from these communities, such as Albert Namatjira, and the internationally recognised Tjapaltjarri Brothers.
The history of Aboriginal Australians in the desert regions is a testament to their resilience, adaptability, and deep connection to the land. Their presence in these extreme environments challenges the notion that these areas were only occupied by transient dwellers.
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The diversity of lizard fauna in the deserts
The Australian desert is home to a diverse range of lizard species, with over 40 species found in the desert regions. This diverse lizard fauna is a reflection of the varying landscapes of the Australian desert, which include sand dunes, rocky plateaus, and sparse shrublands. The ability of lizards to adapt to different environments has allowed them to become one of the most diverse groups of reptiles globally.
Lizards have evolved a range of adaptations to survive in the desert's harsh conditions. For example, the thorny devil, a small lizard covered in spines, has a unique method of collecting water by channelling dew and rain along grooves on its body. Similarly, the sand goanna (Varanus gouldii) burrows underground to escape the extreme heat. Some lizards, like the geckos, have toe pads that allow them to adhere to smooth surfaces, aiding their movement in rocky habitats and facilitating their hunting and survival skills.
The frilled lizard, with its distinctive neck frill, is another fascinating species found in the Australian desert. This lizard inflates a large frill around its neck when threatened, surprising potential predators and giving it a chance to escape. The bearded dragon, often kept as a pet, is also native to the Australian desert and is known for its spiky beard and calm demeanour.
The perentie, Australia's largest monitor lizard, is an apex predator found in the desert regions. It preys on a variety of animals, utilising its strength and agility. Monitor lizards are primarily found in deserts, grasslands, and forests, showcasing their adaptability to different habitats.
The diversity of lizard fauna in the Australian desert is a testament to the resilience and adaptability of these reptiles. They have evolved unique physical and behavioural traits to survive in extreme temperatures and limited water availability, contributing to the ecological balance of these desert ecosystems.
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The fluctuating climate of the deserts
The climate of Australia's deserts is a fluctuating and complex ecosystem. Covering about 1,371,000 square kilometres, or 18% of the Australian mainland, the Great Australian Desert collectively encompasses a significant portion of the country's landscape. Despite this vast expanse, the desert is home to a relatively small human population, with only about 800,000 residents, including numerous Aboriginal communities.
The desert's climate is characterised by high temperatures and aridity. Summer daytime temperatures can soar to a sweltering 50 °C (122 °F), while winter maximums typically range from 18°C to 23 °C (64-73 °F). However, the winter nights can be surprisingly mild, rarely dipping below 2-3 °C (28-26 °F). This temperature variation is a key feature of the desert's climate.
The rainfall in the Australian desert is sporadic and unpredictable. While the average annual rainfall is around 81 to 250 mm (3.2 to 9.8 inches), it is considered a semi-arid climate due to the high evaporation rate. Central Australia, in particular, is arid, with some areas receiving as little as 150 mm (5.9 inches) of rainfall annually. Thunderstorms are a common occurrence, with 15 to 20 storms on average each year, providing a much-needed water source for the region.
The northwestern region of the desert plays a crucial role in the formation of heat lows, which drive the NW monsoon. This monsoon brings rain to the region, along with the occasional tropical cyclone rain depression. The desert's aridity is further exacerbated by its high evapotranspiration rate, with annual evaporation ranging from 2400 to 4400 mm (94 to 173 inches). This combination of factors results in a challenging and ever-changing climate for those who call the Australian desert home.
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The unique flora of the desert regions
The flora of Australia's desert regions is unique and varied. Spinifex or hummock semi-desert grasslands, with their spiny-headed grasses, are a distinctive feature of the landscape. These grasses grow in clumps, with green Triodia pungens and blue-grey Triodia basedowii varieties. The Spinifex grasslands prevent the desert from becoming barren sand dunes, like those of the Sahara, and they also provide food for some animals, such as termites. Soft spinifex grasses can grow up to 6 inches in height and thrive in the arid, infertile soils of the Australian desert.
The Mulga shrublands, dominated by the acacia species of the same name, are another important habitat. Mulga bushes grow on the plains, slopes and hills of the deserts, providing a habitat for many species. However, these landscapes are vulnerable to bushfires, which are often ignited by spinifex grasses. The non-resistant mulga bushes tend to burn and then struggle to grow back, and they are also threatened by human activities such as deforestation and livestock farming.
The arid Eucalypt woodlands, found in gorges and along dry riverbeds, are home to rock wallabies and other species. The chenopod shrublands are another habitat found in southern Australia, and they are characterised by their bright orange-red soils.
Some unique plant species found in the Australian deserts include the Desert Bloodwood Tree, which can grow up to 30 feet tall and has the ability to store water in its roots, and the Desert Walnut, which is used by Aboriginal people for medicinal purposes. The Parkinsonia Aculeata, introduced to Australia in the early 20th century, has now become a widespread weed, impacting native ecosystems and human activities.
While the diversity of bird species in the Australian arid areas may not be as high as in other habitats, the deserts are home to some colourful birds, such as the Australian Bustard and the Spinifex Pigeon. The arid conditions have also given rise to unique flowering plant species, including the Parakeelya flower and the Ptilotus genus, which features pink, tail-like flowers.
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The small percentage of the population living in the arid zone
Australia's deserts make up around a fifth of the country, or about three-quarters of the continent. Despite this, only a small percentage of the population—between 3% and 5%—lives in the arid zone. This amounts to around 800,000 residents.
The desert regions are home to numerous Aboriginal peoples, who live in settlements and manage a large part of the land as nature reserves. There are approximately 1,200 small Indigenous communities, of which almost half have a population of fewer than 100 people. The Aboriginal populations in these regions have been increasing.
The desert includes a rich diversity of lizard fauna, with over 210 species of reptiles, including the vulnerable great desert skink and the endangered sandhill dunnart. The most numerous species of lizards in the world can be found in the Australian desert, with over 40 species present.
The desert landscapes vary, from red sand plains and dunes to saltwater lakes and rock-covered ridges. The fluctuating climate can transform the landscape, with rare heavy rains bringing wildflowers, wetland foliage, and an abundance of wildlife.
Aboriginal people in the desert regions have a rich cultural heritage, with distinct languages, art forms, and survival techniques. They have a long history of living in harmony with the challenging desert environment.
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Frequently asked questions
Yes, around 3% of the Australian population, or 800,000 residents, live in the Australian arid zone, which covers more than just the 10 Australian deserts. About a third of these deserts are Aboriginal lands, with numerous Aboriginal peoples living in settlements in the deserts.
The Gibson Desert is home to the Pintupi tribe, who lived a nomadic hunter-gatherer lifestyle until they first made contact with modern Australia in 1984 due to a severe drought. The Great Victoria Desert, the largest desert in Australia, is home to the Aboriginal people of the Kogara, Mirning, and Pitjantjatjara groups. The Simpson Desert, which spans the Northern Territory, Queensland, and South Australia, is inhabited by Aboriginal people, including the Wangkangurru. The Strzelecki Desert, the Great Sandy Desert, and the Little Sandy Desert are some other Australian deserts where Aboriginal people live.
The Australian deserts have constantly fluctuating climates, with drought and flooding rains being common occurrences. The isolated desert areas remained underdeveloped for a long time, lacking proper medical facilities and trained personnel. The Spinifex people, for example, were expelled from their tribal lands in the 1950s due to nuclear weapons testing. Additionally, the desert conditions are challenging for human survival, with high temperatures, limited water sources, and the presence of venomous snakes and other dangerous wildlife.
