Leslie Massey
Dugongs are large, grey marine mammals that are closely related to elephants. They are culturally significant to many coastal First Nation communities. Dugongs inhabit shallow, tropical waters and feed on seagrass. They are found in the Indo-Pacific region, with the largest population in the world found in Australia, specifically in the waters between Shark Bay in Western Australia and Moreton Bay in Queensland.
| Characteristics | Values |
|---|---|
| Global distribution | Tropical and subtropical waters |
| Australian distribution | Northern Australia, from Moreton Bay to Shark Bay |
| Population | The largest in the world |
| Habitat | Shallow, coastal waters with seagrass meadows |
| Feeding grounds | Ningaloo Reef, Great Barrier Reef, Moreton Bay Marine Park, Great Sandy Marine Park |
| Diet | Seagrass |
| Size | Up to 3-4 metres long and 400-500 kilograms |
| Lifespan | Up to 70 years |
| Reproduction | Females give birth to one calf every 3-7 years |
| Conservation status | Vulnerable to extinction |
| Threats | Human practices such as hunting, pollution, climate change, commercial netting, habitat degradation, boat strikes |
| Cultural significance | Essential to the culture of Aboriginal and Torres Strait Islander people |
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What You'll Learn
- Dugongs are found in the Great Barrier Reef, Ningaloo Reef, and Shark Bay
- They are culturally significant to Aboriginal and Torres Strait Islander people
- Dugongs are vulnerable to human-related threats like boat strikes and fishing nets
- They are slow-moving, solitary, and have poor eyesight
- Dugongs are protected under Australian government legislation
Dugongs are found in the Great Barrier Reef, Ningaloo Reef, and Shark Bay
Dugongs, the 'sea cows', are marine mammals that are closely related to elephants. They are found in the warm waters of the Indo-Pacific region, with the largest population in Australia, particularly in the northern waters between Shark Bay in Western Australia and Moreton Bay in Queensland. Dugongs are dependent on seagrass communities for their diet and are thus restricted to coastal habitats that support seagrass meadows. They are usually found at a depth of around 10m, but have been known to travel to deeper waters of up to 37m in search of seagrass.
The Great Barrier Reef, a World Heritage Site, is home to a significant population of dugongs, with numbers estimated to be around 10,000. The reef provides important feeding grounds for these creatures, and their presence in the area has been of cultural significance to the Aboriginal and Torres Strait Islander people for over 60,000 years. The hunting and preparation of dugong meat play an essential role in their long cultural traditions.
Ningaloo Reef, located off the coast of Western Australia, is another area where dugongs are found. While specific population numbers for this reef are not readily available, the broader region of Shark Bay is estimated to have a stable population of over 10,000 dugongs.
Shark Bay, a World Heritage Site located in Western Australia, is known for its stable and significant population of dugongs. The bay provides an ideal habitat for these creatures with its shallow, protected waters and abundant seagrass meadows. The population of dugongs in this area is estimated to be over 10,000, contributing to the overall health and ecological balance of the region.
Dugongs are vulnerable to various human-related threats, including boat strikes, accidental entanglement in fishing nets, and habitat degradation due to coastal development and water pollution. Their slow breeding rate, long lifespan, and susceptibility to these threats highlight the importance of effective management strategies and conservation efforts to protect this vulnerable species.
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They are culturally significant to Aboriginal and Torres Strait Islander people
Dugongs are large, grey, herbivorous mammals that inhabit shallow, tropical waters throughout the Indo-Pacific region. Australia hosts the largest number of dugongs, with the Reef providing an important feeding ground. They are found mostly in northern Australian waters between Shark Bay in Western Australia and Moreton Bay in Queensland. The Great Barrier Reef region supports globally significant populations of dugong, which is one of the reasons the area was given World Heritage status.
The activities associated with the hunting of dugongs, and preparing and sharing the meat, have great significance and are an expression of the continuance of long cultural traditions. In remote coastal areas, dugongs have a high social and economic value because they provide subsistence food to communities where a nourishing diet is essential but often expensive to attain.
The Torres Strait Islander people have a profound and beautiful relationship with dugongs. They see them in an ancestral sense and sing to them and tell stories about them. There is archaeological evidence of over 4000 years of this relationship, with dugong skulls arranged in circles over many years.
Indigenous communities are working collaboratively with government agencies and scientists to develop and implement community-based management for the sustainable hunting of dugongs.
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Dugongs are vulnerable to human-related threats like boat strikes and fishing nets
Dugongs are large, grey, herbivorous mammals that spend their entire lives in the sea. They are closely related to elephants and occur in tropical and subtropical waters around the world. Dugongs are found in warm coastal waters of the Indian and Pacific Oceans, with the largest populations living off the coast of western and northern Australia. In Australia, they are protected under various pieces of legislation, including the Environment Protection and Biodiversity Conservation Act 1999, which lists them as marine and migratory species.
Despite these protections, dugongs are vulnerable to human-related threats such as boat strikes and fishing nets. Boat engines create underwater noise pollution, which can interfere with dugong communication, navigation, and foraging, potentially leading to disorientation and stress. In addition, excessive boat activity can degrade seagrass meadows and interrupt dugong feeding and breeding cycles. Dugongs rely on seagrass, which they graze on, and the degradation of their feeding grounds directly leads to their decreasing population.
Dugongs are also vulnerable to accidental capture in fishing nets, including gill nets and mesh nets. They can become entangled in these nets, leading to drowning and further degrading their population. The use of different net types by rural coastal communities can lead to over-exploitation and destructive harvesting practices, ultimately damaging the marine ecosystems that these communities depend on.
To address these threats, effective management strategies and conservation planning are necessary. This includes developing alternative livelihoods for rural coastal communities, improving public understanding of dugongs and their habitats, and consulting communities to implement relevant incentives for changing destructive behaviour and encouraging sustainable practices.
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They are slow-moving, solitary, and have poor eyesight
Dugongs are large marine mammals that can grow to about three metres in length and weigh up to 400 kilograms. They are slow-moving, solitary, and have poor eyesight. They are closely related to elephants and are the only marine mammals in Australia with a primarily herbivorous diet, feeding on up to 30kg of seagrass each day. They are an important part of the culture and diet of Indigenous Australians, particularly those in northern Australia and along the Great Barrier Reef.
Dugongs inhabit shallow, tropical waters in the Indo-Pacific region, with the largest populations occurring in northern Australian waters between Shark Bay in Western Australia and Moreton Bay in Queensland. They are slow breeders with long lifespans, making them vulnerable to threats such as habitat degradation, boat strikes, and entanglement in fishing nets and marine debris.
Due to their poor eyesight, dugongs rely on other senses such as smell, touch, and hearing for navigation and communication. They use sensitive bristles on their upper lip to locate and grasp seagrass, and these bristles also provide a tactile sense to feel their surroundings. Their diet of seagrass means they are restricted to coastal habitats with seagrass meadows, and they are not typically found in large groups due to the limited capacity of seagrass beds to support many individuals.
While dugongs are social animals, they are often solitary or found in pairs. They communicate with each other using a variety of sounds, including chirps, whistles, and barks, which echo underwater. Visual communication is limited due to their poor eyesight and is primarily used for courtship purposes. Their slow movement, at a gentle pace of about 10 km/hr, and their solitary nature, make them difficult to observe, and little is known about their behaviour.
The conservation status of dugongs is a concern, and they are listed as vulnerable to extinction. Australia has a significant responsibility in dugong conservation as it hosts the largest number of dugongs globally, particularly in the Great Barrier Reef region. Effective management strategies and protection measures are essential to ensure the survival of these unique and culturally significant marine mammals.
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Dugongs are protected under Australian government legislation
Dugongs are large, slow-moving grey sea mammals that spend their entire lives in the sea. They are closely related to elephants and can grow up to three metres long and weigh 400 kilograms. Dugongs are found in tropical and subtropical waters around the world, but Australia hosts the largest number of dugongs, with the Reef providing an important feeding ground. They are found in the shallow coastal waters of northern Australia from the Queensland/New South Wales border in the east to Shark Bay on the Western Australian coast. They are also found in other parts of the Indian and Pacific Oceans in warm, shallow seas where seagrass is found. Dugongs are dependent on shallow coastal waters and are vulnerable to rising sea levels and extreme weather events, such as cyclones, flooding and water pollution, which destroy their critical seagrass meadows.
Dugongs are an essential element of Aboriginal and Torres Strait Islander people's living maritime culture along the Great Barrier Reef World Heritage Area. The hunting and sharing of dugong meat have great significance and are an expression of the continuance of long cultural traditions. Dugongs also provide valuable protein in regions where fresh food is expensive and difficult to obtain.
In Australia, dugongs are protected under the Australian Government's Environment Protection and Biodiversity Act 1999 (EPBC Act), which lists them as marine and migratory species, and various State and Northern Territory legislation. They are also protected by other Commonwealth legislation, such as the Great Barrier Reef Marine Park Act 1975, where they are a protected species. The Queensland Government's Nature Conservation (Wildlife) Regulation 2006 lists dugongs as 'vulnerable to extinction'.
Indigenous communities are working collaboratively with government agencies and scientists to develop and implement community-based management for the sustainable hunting of dugongs. This work is primarily supported through the Australian Government's Caring for Our Country and Working on Country programs. Under the Native Title Act 1993, dugongs may be legally hunted by Aboriginal and Torres Strait Islander people for personal, domestic or non-commercial communal needs.
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Frequently asked questions
Dugongs can be found in the tropical waters of northern Australia, between Shark Bay in Western Australia and Moreton Bay in Queensland. The Great Barrier Reef is also home to dugongs, with the Southern Great Barrier Reef population being in decline. The Ningaloo Reef in Western Australia is considered the best place to spot dugongs in their natural habitat.
Dugongs are culturally significant to many coastal First Nation communities in Australia. Dugong hunting is important for maintaining family relations and social structure, and it also serves ceremonial and community purposes. Dugongs are also a source of valuable protein in regions where fresh food is hard to come by.
Dugongs are vulnerable to extinction due to human impacts such as hunting, pollution, and climate change. Their main source of food, seagrass, is being destroyed by coastal development, water pollution, and extreme weather events. They are also threatened by accidental drowning in fishing nets, boat collisions, and habitat degradation.
