Lexi Webster
Australia is a large nation with a varied ecology, consisting of 40 ecological regions within eight different terrestrial biomes. The dominant natural biome in Australia is the grassland biome, with the Australian tundra, a frozen desert of grassland and shrubs, located on the Antipodes Subantarctic Islands. The Australian mainland is surrounded by the Aquatic (marine) biome, and the country also has tropical and subtropical forests, desert, and Mediterranean woodlands and temperate forests. The alpine biome, covering 0.15% of the continent, is found in the southeastern corner of the country.
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What You'll Learn
Tropical and subtropical forests
Australia is home to a variety of natural biomes, including tropical and subtropical forests. These forests are typically found in areas with high rainfall, often favouring sheltered gullies from sea level up to about 900 metres. The subtropical rainforests in Australia are known for their diverse and lush vegetation, including a multi-layered canopy of tree species, many of which exhibit buttressing. Some common tree species found in these forests include the ubiquitous Strangler Fig, Bangalow Palms, and various woody vines. The ground cover in these forests is usually limited to leaf litter, with some large epiphytes such as orchids and ferns.
One notable example of a subtropical rainforest in Australia is the Tweed Heads Historic Site, where visitors can observe mixed littoral rainforest and remnant coastal and swamp forest vegetation. This site showcases the beauty and ecological significance of these forests. The subtropical rainforests in Australia also include palm rainforests, mangrove forests, paperbark, and reed swamps, although access to some of these areas may be restricted due to habitat sensitivity and the presence of threatened species.
The dry rainforest, a variation of the subtropical rainforest, exhibits scattered emergent species such as Hoop Pine, Teak, and Lacebark trees in the upper canopy, with a less diverse lower canopy. Buttressing and palms are typically absent or uncommon in dry rainforests, and they are characterised by a well-developed layer of prickly shrubs. The transition from dry rainforest to eucalypt and sclerophyll forests can be quite abrupt, and this type of rainforest can be observed in national parks such as the Tweed Volcano and Wilson Nature Reserve.
In contrast to the lush rainforests, Australia also boasts expansive stretches of savanna, particularly in the northern regions from Broome to Townsville. This biome, known as the Australian tropical savanna, is characterised by dense grass and scattered trees. The Australian Alps, extending over 1.6 million hectares across Victoria, New South Wales, and the Australian Capital Territory, present yet another unique biome, showcasing alpine and subalpine landscapes that contribute significantly to the country's natural beauty and ecological value.
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Grasslands
Australia is home to a diverse range of natural habitats, and among these, grasslands are a significant component, covering vast areas of the continent. The grasslands of Australia are characterized by a dominance of grasses, ranging from tall, dense tussocks to shorter, sparse grass species, with occasional scattered trees and shrubs. These grasslands occur across different regions, each with its own unique blend of climate, soil, and topography, which together shape the character of the grassland ecosystem.
One of the most prominent types of grassland in Australia is the tropical grassland, found in the country's northern regions. Here, the climate is typically monsoonal, with a distinct wet season and a dry season. During the wet season, heavy rainfall transforms the landscape into a lush, green pasture, providing ideal conditions for the growth of tall, robust grasses. However, during the dry season, the grass cover dries out, turning the landscape into a dry, golden plain. This seasonal fluctuation in the availability of water and the resulting change in grass cover have a profound influence on the animals and people that depend on these grasslands.
In contrast, the temperate grasslands occur in regions with a more moderate climate, receiving rainfall throughout the year, albeit with seasonal variations. These grasslands are often characterized by a mix of perennial and annual grasses, with a more consistent cover of vegetation. The temperate grasslands of Australia are often utilized for livestock grazing, particularly for sheep and cattle, forming the basis of a thriving agricultural industry. The consistent availability of grass throughout the year makes these regions ideal for pastoral activities.
Furthermore, Australia is also home to alpine grasslands, found at higher elevations, typically above the tree line. These grasslands occur in mountainous regions, where the climate is cooler and the air is thinner. The grass species found here are adapted to the harsh, cold conditions, strong winds, and shorter growing seasons. Alpine grasslands often provide vital habitats for unique species of flora and fauna, many of which are endemic to these high-altitude environments.
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Tundra
Australia is a nation of diverse landscapes, from its tropical savannas to its alpine peaks. The country is home to 40 distinct ecological regions, each with its own unique mix of plant and animal life. One of these regions is the tundra, a frozen desert located on the Antipodes Subantarctic Islands. This ecoregion is characterised by grassland, shrubs, algae, lichen, and the endemic Cyathea tree fern. With no native mammals, reptiles or amphibians, the islands serve as a breeding ground for seals, sea lions and elephant seals.
The tundra in Australia is a cold and windswept place, a sharp contrast to the more familiar image of the country's hot and arid Outback. The Antipodes Subantarctic Islands, where the tundra is found, are made up of five island groups: Macquarie, Heard, McDonald, and two others. These islands lie roughly halfway between Tasmania and Antarctica, and their remoteness adds to the wild, natural beauty of the tundra landscape.
The Australian tundra is not the only biome in the country that defies the typical image of Australia's environment. The Australian Alps, for example, cover about 11,000 square kilometres, or 0.15% of the continent, with peaks in the southeastern corner of the country. Despite their relatively small size, these alpine and subalpine ecosystems are incredibly valuable, providing billions of dollars' worth of benefits annually.
In addition to the tundra and alpine regions, Australia is home to a range of other biomes, including tropical and subtropical moist broadleaf forests, temperate grasslands, savannas, and shrublands. Each of these biomes contributes to the country's rich biodiversity, showcasing the diverse and unique nature of Australia's natural environment.
The tundra, however, stands out as a particularly distinct and extreme environment, a frozen desert in a country more often associated with scorching deserts and sunny beaches. This contrast highlights the incredible diversity of Australia's landscapes and the resilience of its flora and fauna, which have adapted to thrive in a range of challenging habitats.
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Alpine and subalpine landscapes
The Australian Alps, a mountain range in southeast Australia, is home to the country's alpine and subalpine landscapes. Covering about 11,000 square kilometres or 0.15% of the continent, these ecosystems are a source of immense natural value and provide several economic benefits to the nation. The Australian Alps are a part of the Great Dividing Range, which runs about 3,000 km from northern Queensland through New South Wales and into the northern part of Victoria. The range comprises two biogeographic sub-regions: the Snowy Mountains, including the Brindabella Range, located in New South Wales and the Australian Capital Territory; and the Victorian Alps, located in Victoria, also known as the "High Country".
The Australian Alps are characterised by a high plateau with rolling hills spread across a long, wide plateau. The highest mountain range in Australia, it contains the only peaks that exceed 2,000 meters in elevation and is the only bioregion on the Australian mainland that experiences deep snowfall annually. The formation of the Australian Alps was largely complete around 100 million years ago, with minor uplift episodes occurring over the next 90 million years. During the Pleistocene ice age, small glaciers formed in the vicinity of Mount Kosciuszko, the continent's highest peak at 2,228 meters above sea level.
The alpine climate is cold, wet, snowy, and windy, with a short growing season. The soils are highly organic and capable of retaining large amounts of water. The vegetation consists of short plants, including tussock-forming snow grasses, rosette-forming herbs like snow daisies, and ground-hugging shrubs. The dominant plant communities are grasslands, herbfields, heathlands, and wetland complexes. Invertebrates such as moths, grasshoppers, and ants are the primary animal species.
The Australian Alps are vital for conservation, recreation, and water drainage. Major rivers like the Murray, the Murrumbidgee, and the Snowy originate in these mountains, and the water from the alpine catchments contributes significantly to the Australian economy. The Alps are a popular tourist destination, attracting millions of visitors annually for camping, walking, skiing, and other outdoor activities. The range is also of significant historical and scientific interest, with a rich history of scientific study dating back to the 1850s.
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Savanna
The Australian tropical savanna is an area of dense grass and scattered trees that stretches across northern Australia from Broome to Townsville. It is one of the world's largest tropical savannas, providing a home to many unique animals and plants. The savanna is characterised by its flat landscape, with few trees and shrubs due to frequent fires during the dry season, which typically lasts from May to October. The dry season is followed by heavy thunderstorms and monsoons, making the region prone to flooding. The savanna is also known for its unique vegetation, including the eucalyptus tree, which is famous for its oil, gum, and timber.
The Australian savanna is quite distinct from other savannas globally, owing to its location south of the equator, which results in seasonal variations. Savannas are typically found near the equator and experience both rainy and dry seasons. The Australian savanna has a unique climate, with cooler temperatures, clear skies, and low humidity during the dry season. The region's climate is significantly influenced by its proximity to the equator, resulting in warm to hot weather.
The savanna is a mixed woodland-grassland biome, featuring grassy woodlands with trees spaced apart, forming a light canopy. This open canopy allows sufficient light to reach the ground, supporting a layer of grasses. The savanna can be further classified into four types: savanna woodland, tree savanna, shrub savanna, and grass savanna, each with varying densities of trees and shrubs.
The Australian savanna is facing various threats, including foreign pests and weeds, agricultural expansion, and bauxite mining. These activities pose risks to the region's ecosystems and native species, with some species becoming endangered or experiencing population declines, such as the Gouldian finch and the Cape York palm cockatoo. Conservation efforts by organisations like the World Wide Fund for Nature (WWF) and the World Wildlife Fund (WWF) in Australia are working to protect this unique biome.
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Frequently asked questions
Australia is comprised of 40 ecological regions within 8 different terrestrial biomes. The dominant biome is dependent on the region of Australia in question, but the country is known for its grasslands and shrublands, which exist throughout the country due to a lack of rainfall.
Australia is home to a variety of biomes, including tundra, savanna, desert, and woodland.
The Australian tundra is found on the Antipodes Subantarctic Islands, which are made up of 5 island groups. This area is marked by grassland, shrubs, algae, and lichen.
The Australian tropical savanna is an area of dense grass and scattered trees that stretches across northern Australia from Broome to Townsville.
The Eastern Australian Temperate Forests is a woodland biome that has been heavily impacted by the timber industry and agriculture. This biome is known for its rich soils and abundance of Eucalyptus tree species and endemic bird species.
