Leslie Massey
Water buffalo, which are native to Southeast Asia, were introduced to Australia in the 19th century as working animals and a source of meat for remote northern settlements. Over time, they became feral and spread across the country, causing significant environmental damage. Today, they are considered a pest in certain regions, particularly in the Top End and the northern floodplains, where they have been known to destroy vegetation, erode soil, and foul water bodies. Due to their large size and hard hooves, they can also compact soil and increase erosion, impacting the natural ecosystem. Currently, the Australian government and landowners are exploring solutions to control the growing buffalo population, including culling and selling carbon credits to fund management strategies.
| Characteristics | Values |
|---|---|
| Location | Northern Territory (NT), Arnhem Land, Top End, Northern floodplains, Great Dividing Range |
| Weight | 450-1200 kg |
| Diet | Herbivore |
| Environment | Floodplains, woodland, sandstone escarpment areas with surface water |
| Annual Rainfall | >1000mm |
| Control Methods | Aerial shooting, ground shooting, culling |
| Management | NT Government works with Indigenous communities, some herds are domesticated, pet meat shooting, live export |
| Impacts | Spread weeds (e.g. Mimosa pigra), reduced nesting activity of magpie geese and crocodiles, environmental damage (soil erosion, vegetation destruction), saltwater intrusion into freshwater plains |
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What You'll Learn
Environmental impact of feral buffalo in Australia
Water buffalo, which were imported into Australia's Northern Territory (NT) in the 19th century, have spread to all major habitat types in the region north of latitude 16°S. They are found in floodplain, woodland, and sandstone escarpment areas with surface water. Feral buffalo in Australia cause significant environmental damage through their movement and feeding habits.
Feral buffalo in Australia have been found to spread weeds, particularly Mimosa pigra, on floodplains. They have also been observed to reduce the nesting activity of magpie geese and crocodiles, which has a major impact on the natural ecosystem, as well as commercial crocodile practices. In addition, buffalo movement creates swim channels that destroy vegetation and erode soil by generating new drainage channels. These channels have caused saltwater intrusion into freshwater plains, such as in the Mary River area, leading to the loss of large areas of paperbark forest.
The world's largest wild population of water buffalo roams Australia, and their numbers have rebounded after earlier culls to more than 200,000. As high-emitting ruminants, they produce methane, a potent greenhouse gas, through the fermentation of vegetation in their stomachs. Culling these buffalo could help tackle climate change by reducing methane emissions and the negative impact on ecosystems, while also creating new income streams for landowners and managers.
Aerial shooting is the most effective method to control feral buffalo numbers in Australia, with some success also seen with ground shooting. The NT government collaborates with Indigenous communities to manage and monitor these buffalo populations.
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Methods of controlling buffalo populations
Water buffalo were introduced into northern Australia from Southeast Asia between 1826 and 1866. They became feral when early British settlements were abandoned, and they spread to occupy all major habitat types in the Northern Territory north of latitude 16°S.
Water buffalo are a large herbivore, weighing between 450kg and 1200kg. They are found in floodplain, woodland, and sandstone escarpment areas where there is surface water. They are also well-adapted to wet conditions and can survive on poor-quality vegetation. This makes them ideal for controlling vegetation growth in natural wetlands.
However, when left uncontrolled, water buffalo can cause significant environmental damage. They can trample vegetation, disturb nesting sites for birds and reptiles, and spread exotic weeds. They also emit large amounts of methane, contributing to climate change. As such, there have been efforts to control their population.
Culling
Culling is one method that has been used to control the feral buffalo population in Australia. Between the 1880s and 1956, buffalo were intensively used for hides, and this likely had a negative impact on their population growth. More recently, culling has been proposed as a way to reduce greenhouse gas emissions and earn carbon credits. The income generated from selling these credits could potentially outweigh the costs of culling and provide an incentive for landowners to manage buffalo populations on their land.
Aerial and Ground Shooting
Aerial shooting is considered the best way to control buffalo numbers, with some success also seen through ground shooting. The Northern Territory (NT) Government works with Indigenous communities to help manage and monitor feral buffalo populations.
Bovine Tuberculosis Eradication
Since the 1980s, buffalo numbers have declined due to intensive efforts to eradicate bovine tuberculosis, of which feral buffalo and cattle are hosts.
Pet Meat Shooting and Live Export
In some areas, buffalo herds are managed through pet meat shooting and live export.
Despite these efforts, controlling buffalo populations can be challenging due to their high breeding rates and migration between different areas. Additionally, the scale of the task can be larger than the available budget, especially for remote areas. As a result, buffalo populations have rebounded after earlier culling programs, and the largest population in Arnhem Land continues to grow.
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The benefits of buffalo culling
Water buffalo, which were imported into Australia in the 19th century, are now the world's largest wild population of the species. They are a source of environmental damage, trampling vegetation, disturbing nesting sites, and spreading weeds. They are also a source of methane emissions, contributing to climate change.
Environmental recovery
Culling buffalo would allow the wetlands and floodplains they damage to recover. This would help these natural systems hold their carbon better, reducing greenhouse gas emissions and boosting the regional ecosystem.
Economic benefits
If landowners, land managers, and governments could claim carbon credits for culling, it would become a source of profit rather than an expense. This would open new income streams for landowners and managers, and the income from selling carbon credits could outweigh the costs of culling.
Social benefits
The social benefits of buffalo culling include employment, business opportunities, and infrastructure development.
Population control
Culling is an effective tool to control the buffalo population, which has rebounded from earlier culls to over 200,000. While mustering is often used for commercial gain, it does not reduce the population as effectively as culling, especially in remote areas.
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The cost of controlling feral buffalo
Water buffalo were imported into Australia's Northern Territory in the 19th century as working animals and a source of meat for remote settlements. When these communities were abandoned, the buffalo were released, and their numbers grew. Feral buffalo are a large herbivore, weighing between 450kg and 1200kg. They are found in floodplain, woodland, and sandstone escarpment areas with surface water.
Feral buffalo have caused significant environmental damage in Australia. They have destroyed vegetation and eroded soil by creating new drainage channels, leading to saltwater intrusion into freshwater plains and the degradation and loss of paperbark forests and natural waterholes. They have also helped spread weeds, particularly Mimosa pigra on floodplains. In addition, they have reduced the nesting activity of magpie geese and crocodiles, impacting natural ecosystems, recreational hunters, and commercial crocodile practices.
Controlling feral buffalo populations in Australia has proven challenging and expensive. Historically, aerial shooting has been used, with shooters deployed in helicopters to cull the animals. Since the 1960s, billions have been spent on controlling feral ruminants in Australia. However, once culling stops, feral animal populations can quickly rebound due to their high breeding rates and migration from neighbouring uncullled areas. The scale of the task can exceed the budgets of land managers, making it difficult to sustain effective control measures.
To address this challenge, researchers have proposed the concept of buffalo carbon credits. The idea is that culling high-emitting ruminants like buffalo could generate carbon credits for landowners and managers. This approach could provide a new income stream while also reducing greenhouse gas emissions and benefiting regional ecosystems. By reducing buffalo pressure, wetlands and floodplains could recover and become more effective at storing carbon.
In recent efforts to manage feral buffalo in Australia, satellite technology has been employed. The "Space Cows" program involves rounding up feral cattle and buffalo, tagging them with solar-powered trackers, and monitoring their movements via satellite. This real-time data is expected to be crucial for controlling and predicting the movement of feral herds, allowing for more targeted interventions.
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Buffalo in Arnhem Land
Water buffalo were imported into the Northern Territory (NT) of Australia in the 19th century as working animals and a source of meat for remote northern settlements. When these early settlements were abandoned, the buffalo were released, and they became feral. Buffalo are a large herbivore, weighing between 450kg and 1200kg. They are found in floodplain, woodland, and sandstone escarpment areas with surface water.
In Arnhem Land, a region in the Northern Territory, about 95% of the buffalo population in the NT is located. The buffalo population in Arnhem Land is increasing in size and range and receives limited management. The largest herds are found in remote areas, which are cut off by monsoonal river systems for about six months of the year.
The buffalo have caused serious environmental damage in some fragile ecosystems, such as the Arafura Swamp. They have also helped spread weeds, particularly Mimosa pigra on floodplains. In addition, evidence suggests that buffalo grazing may reduce the nesting activity of magpie geese and crocodiles, impacting wild crocodile populations and commercial crocodile practices.
To address the environmental impact of the growing buffalo population in Arnhem Land, the NT Government works with Indigenous communities to help manage and monitor feral buffalo. Aerial and ground shooting are effective ways to control buffalo numbers. However, the cost of mounting a harvesting operation in Arnhem Land is extremely high due to the remote locations and the need to negotiate contracts with Traditional Owners (TOs).
There is also a small abattoir in western Arnhem Land at Oenpelli, which could potentially utilise some of the buffalo if throughput could be expanded. Additionally, there is a possibility that the managed removal of buffalo could become eligible for carbon credits or "nature repair" and biodiversity markets, offsetting harvesting costs.
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Frequently asked questions
Buffalo, specifically water buffalo, were imported into the Northern Territory (NT) of Australia in the 19th century. They are now considered a pest in the Top End, particularly in the northern floodplains. They can also be found in Arnhem Land, where they are increasing in size and range with limited management.
Buffalo are considered pests in Australia due to the environmental damage they can cause. They can destroy sensitive wetlands, trample vegetation, disturb nesting sites of birds and reptiles, and spread exotic weeds.
Buffalo, particularly in Australia's floodplains, have been known to spread weeds such as Mimosa pigra.
Buffalo grazing has been observed to reduce the nesting activity of magpie geese and crocodiles, impacting their wild populations.
Aerial and ground shooting have been used to control buffalo numbers in Australia. Additionally, the NT government works with Indigenous communities to help manage and monitor feral buffalo populations.
