Ruqayyah Snyder
Mangrove forests are found in many of Australia's coastal regions, including Queensland, the Northern Territory, Western Australia, Victoria, and South Australia. They are known for their unique growth form, with aerial structural roots and exposed breathing roots, allowing them to thrive in the intertidal zones of tropical, subtropical, and protected temperate coastal areas. These forests provide a habitat for a diverse range of wildlife, support the fishing industry, and have been a valuable resource for Indigenous Australians.
| Characteristics | Values |
|---|---|
| Location | Australia's coastal regions, including Queensland, Northern Territory, Western Australia, Victoria, and South Australia |
| Total area | 0.9 million hectares (0.6% of Australia's native forest cover) |
| Number of species | 41 species from 19 plant families (another source states 45 species from 18 families) |
| Common species | White mangrove (Avicennia marina), also known as grey mangrove |
| Other species | Avicennia integra (found only in Australia, in the Northern Territory, east of Darwin), mangrove palm (Nypa fruticans), mangrove fern (Acrostichum speciosum), mangrove lily (Crinum pedunculatum) |
| Uses | Food (fruit, mud crabs, clams, fish), timber for canoes, paddles, shields, spears, boomerangs |
| Benefits | Protect coastal areas from erosion, storm surge, and tsunamis; provide breeding and feeding grounds for commercially and recreationally important fish and prawns |
| Occurrence | Found in intertidal zones of tropical, subtropical, and protected temperate coastal rivers, estuaries, bays, lagoons, and river deltas |
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What You'll Learn
Mangroves are found in coastal regions across mainland Australia
Mangrove forests occur in the intertidal zones of tropical, subtropical, and protected temperate coastal rivers, estuaries, and bays. They grow in fine sediments deposited by rivers and tides, and their characteristic growth form, including aerial structural roots and exposed breathing roots, helps them cope with regular tidal inundation and a lack of oxygen in the soil.
Mangroves are found in all mainland states and the Northern Territory. Nearly half of Australia's mangrove forests are located in subtropical and tropical areas of coastal Queensland (44% of the continent's total), followed by the Northern Territory (37%) and Western Australia (17%).
In addition to providing a habitat for a diverse range of plant and animal life, mangroves have traditionally been used by Indigenous Australians as a source of food, including mangrove fruit, mud crabs, clams, and fish such as barramundi. The timber from mangroves has also been used to make canoes, paddles, shields, spears, and boomerangs. Today, mangroves continue to be of significant ecological and economic value, providing breeding and feeding grounds for commercially and recreationally important fish and prawn species.
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They are used as a source of food by Indigenous Australians
Mangroves are found in many of Australia's coastal regions, including Queensland, the Northern Territory, Western Australia, Victoria, and South Australia. They are particularly prevalent in the intertidal zones of tropical, subtropical, and protected temperate coastal rivers, estuaries, and bays.
Indigenous Australians have traditionally utilised mangroves as a source of food. The diverse ecosystem of the mangroves supports a variety of plant and animal resources that are harnessed by Indigenous communities. One of the most important sources of sustenance from the mangroves is the variety of fish species that thrive in these environments. Fish, such as barramundi, are abundant in the waters around the mangroves and provide a rich source of protein for Indigenous Australians. In addition to fish, mangroves are also home to mud crabs, which are eagerly sought after as an important food source. Indigenous women often take the lead in hunting these crabs, using sticks to extract them from their holes before disarming and cooking them.
Clams, another type of shellfish, are also found in mangrove habitats and contribute to the dietary needs of Indigenous communities. The unique environment of the mangroves also supports the growth of mangrove fruit, which is edible and provides a source of nutrition for Indigenous Australians. The mangrove ecosystem further extends its benefits by providing timber that can be used for the creation of canoes, paddles, and weapons like shields, spears, and boomerangs.
The mangroves also play a crucial role in supporting the lifecycle of various species that are utilised for food. About 75% of the fish and prawns caught for commercial and recreational purposes in Queensland spend at least part of their lifecycle in mangroves. This highlights the indirect contribution of mangroves to the food sources available to Indigenous Australians. Additionally, mangroves provide shelter and breeding grounds for birds like the vulnerable lesser noddy, which builds nests in their leaves.
While the mangrove plants themselves are not commonly used directly as a food source due to the presence of tannins and other unpalatable chemicals, their flowers are an important source of honey. Native bees are attracted to the flowers during the flowering seasons, and commercial apiarists now exploit this source of honey. The expertise in using mangroves for medicinal purposes is also noteworthy, with techniques varying between different groups of Indigenous Australians.
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The white mangrove is the most common species
Mangrove forests are found in many of Australia's coastal regions, covering a total area of 0.9 million hectares, or 0.6% of Australia's native forest cover. Australia is home to more than half of the world's mangrove species, with 41 species from 19 plant families.
The most common species of mangrove in Australia is the white mangrove, or Avicennia marina, which is also known as the grey mangrove. This species is found in mainland coastal areas across Australia and comprises three subspecies. The tree grows to a height of 3 to 10 metres, or up to 14 metres in tropical regions. The white mangrove has a distinctive appearance, with smooth, light-grey bark that can appear whitish, thick, bright green leaves on top, and silvery-white or grey leaves underneath. Its aerial roots, or pneumatophores, grow to a height of about 20 cm.
The three subspecies of white mangrove are found in different regions of Australia. Subspecies A. m. marina is found in Western Australia, from Bunbury in the south to the Kimberley region in the north. Subspecies A. m. eucalyptifolia is found from Wyndham in northern Western Australia to Mackay in Queensland. The third subspecies, A. m. australasica, is found from south of Rockhampton in central Queensland to Victoria and South Australia.
The white mangrove is highly adaptable and can tolerate extreme weather conditions, high winds, and various pests and diseases. It is well-suited to muddy soil conditions with a pH value between 6.5 and 8.0, but it is intolerant of shade. The species is also found outside of Australia, in Africa, Asia, and New Zealand.
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Mangrove forests are breeding grounds for fish and crustaceans
Mangrove forests are ecologically important ecosystems that provide habitats for a wide range of species. They are breeding grounds for many species of fish and crustaceans, including those of commercial and recreational value. For example, barramundi, mangrove jack, mud crabs, and banana prawns. In fact, about 75% of the fish and prawns caught for commercial and recreational purposes in Queensland spend at least part of their lifecycles in mangroves.
Mangroves are found in the intertidal zones of tropical, subtropical, and some protected temperate coastal rivers, estuaries, and bays. They grow in fine sediments deposited by rivers and tides. The greatest diversity of species is found in the far northern and north-eastern coasts of Australia, becoming sparser with increasing latitude. For instance, Darwin Harbour in the north of Australia contains 36 mangrove tree species, while Bunbury in the south contains only one.
The unique growth form of mangrove trees, with their aerial structural roots and exposed breathing roots, helps them cope with regular tidal inundation and the lack of oxygen in the soil. This also creates an environment that is ideal for breeding fish and crustaceans. The massive root systems of mangroves are efficient at dissipating wave energy, protecting coastal areas from erosion, storm surges, and even tsunamis.
Mangrove forests also support several salt-tolerant plant species, such as the mangrove palm, mangrove fern, and orchids, which are not classed as mangroves. They provide shelter for animals such as the rusty monitor, the mangrove snake, and the estuarine crocodile. The lesser noddy, a bird listed as vulnerable under Australia's Environment Protection and Biodiversity Conservation Act 1999, builds its nest in mangrove trees.
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They protect coastal areas from erosion and tsunamis
Mangroves are an invaluable ecosystem with exceptional resilience, and they play a vital role in protecting Australia's coastal areas from erosion and tsunamis. While they only cover 0.6% of Australia's native forest, they are found in many of the country's coastal regions, particularly in Queensland, the Northern Territory, and Western Australia.
The intricate root systems of mangrove trees are key to their protective role. These roots act as a natural breakwater, trapping sediments and reducing the impact of waves. By dissipating wave energy and slowing water flow, mangroves effectively shield inland areas from destructive waves, minimising coastal erosion. This process helps to maintain the integrity of coastal landforms and protect adjacent ecosystems such as coral reefs and seagrass beds.
Mangroves also serve as a buffer zone, absorbing the impact of strong winds and reducing the vulnerability of coastal communities to damage and destruction caused by extreme weather events like tsunamis. Their dense vegetation acts as a natural sponge, absorbing and storing excess rainwater, which contributes to flood mitigation during heavy rainfall and storms.
The grey mangrove or white mangrove (Avicennia marina) is the most widespread and common species in Australia. It comprises three subspecies found across mainland coastal areas, with the most inland occurrence at Mandora Marsh, about 60 km from the coast. Mangrove forests support a diverse range of plant and animal life, including salt-tolerant plant species, fish, crustaceans, and birds, showcasing their ecological significance.
Recognising the importance of mangroves is crucial for sustainable coastal development and disaster risk reduction. Conservation and restoration efforts are essential to protect these ecosystems, which provide a first line of defence against natural disasters and contribute to the resilience of Australia's coastlines.
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Frequently asked questions
Mangroves are found in the intertidal zones of tropical, subtropical and protected temperate coastal rivers, estuaries and bays in Australia. They are also found in river deltas, lagoons and swamps.
Mangroves cover only 0.9 million hectares, or 0.6% of Australia's native forest cover. They are found in all mainland states and the Northern Territory. Nearly half of Australia's mangrove forests are in Queensland (44%), followed by the Northern Territory (37%) and Western Australia (17%).
The most common type of mangrove in Australia is the white mangrove (*Avicennia marina*), which has three subspecies found in different regions along the mainland coast. The greatest diversity of mangrove species is found in the far northern and north-eastern coasts of Australia.
