Lyla Lindsey
Australia is home to over 220 species of frogs, some of which are poisonous. One such example is the Magnificent Tree Frog, which is native to the Kimberley region in northwest Western Australia. This frog has a poison gland, the biggest of any amphibian in Australia, that acts as a deterrent to predators. Another poisonous frog in Australia is the Southern Gastric Brooding Frog, which is now feared extinct. The main threat to Australia's native frogs is the invasive Cane Toad, which produces toxins that are harmful to native wildlife. Conservation efforts are being made to protect native animals from the deadly impact of cane toads, including the development of poisonous sausages containing toad meat to train native animals to avoid them.
| Characteristics | Values |
|---|---|
| Number of frog species in Australia | Over 220 named species |
| Frogs found in Western Australia | Green tree frog, Magnificent tree frog, Western spotted frog, Cane toad |
| Poisonous frogs found in Western Australia | Magnificent tree frog, Cane toad |
| Impact of poisonous frogs | Poisoning of pets and humans, depletion of native fauna preyed on by cane toads, reduced prey populations for native insectivores |
| Efforts to mitigate impact | Poisonous sausages containing toad meat, taste aversion projects, humane culling |
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What You'll Learn
The impact of cane toads on Western Australia's native wildlife
Australia's ecology developed in relative isolation prior to European colonisation, resulting in a complex, interdependent system with no natural predators for many species that were later introduced. The sudden introduction of foreign species, including cane toads, has led to severe breakdowns in Australian ecology.
Cane toads have been highly successful as an invasive species, becoming established in over 15 countries in the last 150 years. They were introduced to Australia in 1935 and have since spread across northern and eastern Australia, outcompeting native species for food and habitat. They pose a particular threat to wildlife that prey on them, as the toxins in their skin can be deadly. Many frog-eating native animals, including snakes, lizards, and marsupials, have suffered population declines since the introduction of cane toads.
In Western Australia, the impact of cane toads on native species and their ecosystems can be disastrous. Native frogs are especially vulnerable as a food source for the toads and as competitors for food. Large frog-eating native animals, such as freshwater crocodiles and the northern quoll, are also at risk of substantial declines or even local extinction. These animals are at the top of food webs in Western Australia, so their loss can cause imbalances in predator-prey relationships, leading to cascading effects on other native species.
To protect native wildlife in Western Australia, researchers have been attempting to train large predators to avoid eating adult cane toads by feeding them young, small toads to create a "food poisoning"-like experience. Poisonous sausages containing toad meat are also being trialled in the Kimberley region to deter native animals from eating the toads. The Western Australian Department of Environment and Conservation is working with the University of Sydney to develop baits that blend toad meat with nausea-inducing chemicals to train animals to stay away from the amphibians.
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Poisonous sausages: a potential solution to protect native animals
Poisonous sausages containing toad meat are being trialled in Western Australia to protect native animals from the deadly impact of cane toads. The Western Australian Department of Environment and Conservation has been working with the University of Sydney to develop baits to train native animals not to eat the toads. Cane toads are invasive in Australia, and their toxic defence mechanism has caused the depletion of native species that die from eating them. The baits are made by blending bits of toad with a nausea-inducing chemical, training the animals to stay away from the amphibians.
The cane toad sausages were air-dropped from helicopters in a wide-scale trial across a remote Kimberley cattle station. The researchers hope that by feeding native animals cane toad meat laced with a nausea-inducing chemical, they can train at least some of the animals not to eat the toads. The technique is based on successful similar programs run overseas with different species. The first cane toads to arrive in an area are the biggest and most deadly, so the hope is that native animals can learn to coexist with the smaller and less deadly cane toads that follow.
The taste aversion program has shown promising results in small-scale trials in the East Kimberley region. However, by 2023, field research indicated that the program had not been effective in reducing toad-induced northern quoll decline in the Kimberley. Researchers will continue to tweak the sausage design and delivery to make them more palatable and interesting for the target species, such as quolls.
While the poisonous sausages may not solve the cane toad problem altogether, they are a potential solution to protect native animals from the deadly impact of cane toads. Other methods to control the spread of cane toads in Australia include the construction of toad-proof fences around dams in semi-arid areas, as well as guidelines for the humane culling of cane toads by residents and researchers.
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The native meat ant: immune to cane toad poison
While there are no mentions of poisonous frogs in Western Australia, cane toads, an invasive species, are known to be present in the region. These toads produce toxins that are harmful to humans and animals, and they have had a detrimental impact on the native fauna.
The native meat ant (Iridomyrmex reburrus), however, has been found to be immune to the cane toad's poison. This discovery was made by Georgia Ward-Fear, an Honours student, and it presents an exciting opportunity to control the cane toad population in Australia.
Meat ants are endemic to Australia and are commonly found near water bodies in tropical regions of the country. They are effective predators of cane toads, particularly the young toads or metamorphs, which are small enough for the ants to immobilize and carry away. Unlike native frogs, which actively avoid meat ants, cane toads do not exhibit escape behaviour when approached by the ants. This behaviour may be due to the lack of evolutionary history between cane toads and predatory ants in their native South America.
The immunity of meat ants to cane toad poison is significant because it makes them potential allies in controlling the cane toad population. By preying on young cane toads, meat ants can help reduce the number of toads and mitigate their negative impact on the ecosystem.
In addition to meat ants, some other native insects, such as water beetles and water bugs, have also been found to feed on cane toad tadpoles without being affected by their poison. These findings highlight the importance of studying native predators and their potential role in managing invasive species.
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The RSPCA's guidelines for the humane culling of cane toads
While cane toads are considered pests, they are capable of experiencing pain and distress. Thus, the RSPCA has outlined guidelines for the humane culling of these invasive amphibians. The Australian Government released the Standard Operating Procedure for the Humane Field Euthanasia of Cane Toads (SOP) in 2011, which serves as a basis for these guidelines.
The RSPCA advocates for the establishment of cane toad control centres where trained operators can humanely euthanise the toads. This approach ensures that inhumane methods are not employed and assists those who are unable or unwilling to kill cane toads themselves. Furthermore, the RSPCA supports research into the development of effective control methods, such as trapping large numbers of adults and tadpoles to limit their spread.
To prevent the spread of cane toads, local and state government bodies promote the use of traps placed in the shallow edges of bodies of water. These traps can capture thousands of cane toad tadpoles within hours without impacting the tadpoles of other frog species. Additionally, in semi-arid regions with limited water sources, constructing toad-proof fences around dams can significantly reduce toad survival rates by denying them access to water.
Inhumane methods of culling cane toads are illegal in most states and territories of Australia. Freezing is considered a more humane alternative to physical force, such as hitting them with cricket bats. The RSPCA's guidelines aim to ensure that any measures to control cane toads do not cause unnecessary suffering to these animals.
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The depletion of native species due to cane toads
Cane toads (Rhinella marina or Bufo marinus) were introduced to Australia in 1935 to control native beetles that were damaging sugarcane crops. However, due to the absence of natural predators or diseases that could control their population, they quickly became an invasive species, migrating rapidly and negatively impacting native species.
The cane toad's toxin is its primary defence mechanism, and Australian predators are not adapted to it. Consequently, many native species have suffered precipitous population declines due to lethal poisoning when they attempt to eat cane toads. This includes large-bodied predator species such as the yellow-spotted monitor, whose populations have dropped by up to 90% in habitats invaded by cane toads, and the northern quoll, Mertens' water monitor, and Mitchell's water monitor, which have become endangered following toad invasions. There have also been reports of declines in goanna and snake populations after the arrival of cane toads.
The invasion of cane toads has also led to indirect effects on other native species. For example, the disappearance of predatory goannas due to toad poisoning has resulted in an increase in the number of undamaged saltwater crocodile eggs in the Northern Territory. Additionally, in areas where cane toads have free access to water, they have decimated populations of dung beetles, which could potentially impact the cattle industry through increased disease in cattle.
Some native species, such as the black kite, have learned to avoid the poison-producing glands on the toad's back and attack its belly instead. Others, like the Dahl's aquatic frog, appear to be unaffected by the poison and can eat the tadpoles and live young of the toad. However, overall, the invasion by cane toads has disrupted the complex, interdependent ecology of Australia, leading to severe breakdowns and the depletion of native species.
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Frequently asked questions
Yes, there are. One example is the Magnificent Tree Frog, which is native to the Kimberley region in northwest Western Australia. It has a poison gland on its head, but it is not harmful to humans.
Yes, the Cane Toad is a poisonous toad that has been introduced to Australia. It is native to Central and South America.
The Cane Toad has had a detrimental impact on native species, including the poisoning of pets and humans, the depletion of native fauna that prey on the toads, and the reduction of prey populations for native insectivores.
Yes, there have been attempts to train native animals not to eat Cane Toads. Poisonous sausages containing toad meat are being trialed in Western Australia to protect native animals. Additionally, residents are encouraged to use traps to control the toad population while minimizing the impact on other frog species.
Frogs in Australia face threats such as habitat loss, climate change, and pollution, which have led to declining frog populations.
