Ruqayyah Snyder
Australia is home to about 30,000 species of flies, but only a few are considered pests. The most common types are the bush fly, house fly, blow fly, and mosquito. The first European visitors to Australia recorded the presence of flies, with Commander Francisco Pelsaert writing about the nuisance presented by them. The introduction of cattle by Europeans provided a boost to the population of bush flies, as they breed in animal dung. This, along with the sparse population of humans and dogs, and the introduction of agriculture, led to an increase in fly numbers.
| Characteristics | Values |
|---|---|
| Number of fly species in Australia | 30,000 |
| Common fly types | Bush fly, house fly, blowfly, mosquito |
| Bush fly breeding sites before cattle introduction | Faeces of humans, dogs, larger marsupials, and emus |
| Cattle introduction impact on flies | Boosted fly numbers due to increased dung |
| Dung beetle introduction impact on flies | Reduced fly numbers by processing cattle dung |
| House fly breeding sites | Organic waste, open compost bins, animal droppings |
| House fly attraction | Drawn to sweet foods in houses |
| Stable flies | Blood-sucking flies introduced to Australia in the 19th century |
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What You'll Learn
The introduction of cattle increased the fly population
The introduction of cattle to Australia provided the perfect breeding ground for flies, particularly the bush fly, which depends on faeces for its maggots. Cattle deposit large, moist pats, which are ideal for the flies to lay their eggs in. With no native dung beetles equipped to deal with cow dung, the flies had free rein over this new food source. The introduction of cattle thus led to a significant increase in the fly population.
Before the introduction of livestock, it was assumed that the bush fly bred mainly in human and canine faeces. However, this theory has been questioned as the Aboriginal population was very sparse. It has been suggested that the bush fly may have bred in the faeces of emus, which were more abundant at the time and produce large amounts of dung due to their rapid digestion.
Cattle, however, provide a much more abundant and suitable habitat for the flies. A single large cow pat can produce up to 3000 flies. The introduction of cattle thus created a boom in the fly population, with bush flies becoming a prominent feature of the Australian landscape.
The impact of cattle on the fly population was so significant that even today, despite the introduction of dung beetles and improvements in waste management, cattle remain the main source of faeces for the bush fly. The density of flies in Australia can be largely attributed to the introduction of livestock, particularly cattle, which provided an abundant and easily accessible food source for the flies to proliferate.
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Dung beetles control the number of flies
Flies have been in Australia for a long time, and they are here to stay. While they are excellent pollinators, they are also carriers of diseases and parasites. The introduction of cattle to Australia led to a boost in the population of flies, as they laid their eggs in the dung of these animals.
Dung beetles, as their name suggests, feed on and breed in dung. They are found on all continents except Antarctica and live in various habitats. Dung beetles have a negative impact on fly breeding success, reducing the number of flies in the environment. This impact is due to several factors, including asymmetrical competition for dung resources, mechanical damage to fly eggs, and fly predation by mites that live on dung beetles.
In Australia, the introduction of dung beetles was necessary to control the fly population. Native dung beetles were inefficient at breaking down the large dung pads of cattle, leading to an abundance of flies. The CSIRO began importing dung beetles in the 1960s, and their impact on reducing fly numbers has been significant. These imported dung beetles break up cow dung within 10-30 hours, disrupting the fly life cycle and reducing their numbers.
Dung beetles fall into two categories: summer-active and winter-active. The main breeding period for most dung beetles is spring, and some species have multiple generations per year. Dung beetles are only found in fresh dung, and they can detect it from miles away using their specialized antennae. They feed on the liquid portion of the dung, which is full of microorganisms that provide them with nutrition.
The activities of dung beetles have broader ecological benefits beyond fly control. They improve soil structure and water-holding capacity by incorporating organic matter back into the soil. They are also important secondary seed dispersers, burying seeds that would otherwise be destroyed by rodents and other seed-eating animals. Additionally, dung beetles can serve as biological indicators of changes in the ecosystem due to their sensitivity to alterations in their physical habitat.
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Flies are pollinators and recyclers
Flies have been in Australia for a long time, and they play an important role in the ecosystem. There are about 30,000 species of flies in Australia, and while they are often seen as pests, they are also important pollinators and recyclers.
Flies are excellent pollinators, and many studies suggest they are just as important as bees in this regard. Flies are attracted to the smell of rotting flesh, and while they mate and lay their eggs on corpses and carcasses, they also forage among flowers to feed on nectar and pollen. In doing so, they transport pollen from one flower to another, assisting in the reproduction of flowering plants. Flies are particularly drawn to flowers with putrid odours, such as the red trillium, skunk cabbage, and pawpaw. They also pollinate cocoa flowers, which are small and white and smell somewhat mushroomy, attracting tiny flies known as midges.
Mango growers in Australia have long believed that luring flies to their trees will improve pollination and increase yields. Some growers hang large barrels filled with a mix of chicken and fish from their trees to attract the flies, although there is currently no scientific proof that this method works. However, with the growing demand for food, it is becoming increasingly important to understand how to attract and make use of these pollinators.
In addition to being pollinators, flies are also nature's recyclers. Fly larvae, or maggots, can recycle manure and other organic waste into livestock feed, soil amendments, and even biodiesel fuel. The droppings from the larvae can also be used as plant fertilizer. While the house fly has been overlooked as a recycling agent due to its ability to spread pathogens, the black soldier fly has been approved by the U.S. Food and Drug Administration for this purpose since 2018 as it does not feed and thus does not spread diseases.
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The impact of flies on human health
Flies have long been considered a pest in human societies, and their impact on human health is significant. While they play an important role in the natural ecosystem by aiding the decomposition of rotting organic matter and serving as a food source for other animals, they also pose risks to human health by acting as vectors for pathogens.
Flies are known to carry and transfer pathogens from faeces, garbage, and decaying matter, which can then contaminate food and water. This can lead to the spread of diseases and infections, as flies have been shown to harbour and transmit viable bacterial pathogens. For example, studies have found that house flies can acquire Salmonella enterica from manure and subsequently transmit it to other surfaces or food sources. Additionally, flies may act as short-term and short-distance mechanical vectors for bacteria such as E. coli and C. jejuni, which can be particularly relevant in crowded conditions.
The highly mobile nature of flies contributes to their effectiveness as vectors. Their ability to move between different locations and sources of nutrition facilitates the spread of pathogens over extensive ranges. While the specific drivers of fly movement are not yet fully understood, factors such as sex and the availability of nutritional and ovipositional resources are believed to play a role.
While the presence of flies in Australia predates white settlement, the introduction of imported dung beetles in the 1960s, along with improved waste management practices and insecticides, has helped reduce their numbers in urban areas. However, flies continue to pose a potential threat to human health, and their role as reservoirs and vectors of microbial threats should not be underestimated. Understanding their impact on human health is crucial for developing effective control measures and mitigating the risks associated with fly-borne pathogens.
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Flies were recorded in the 17th century
The presence of flies in Australia was recorded in the 17th century, with Dirk Hartog in 1616 and William Dampier in 1699 reporting that bush flies were a massive pest. In June 1629, the Dutch ship Batavia was wrecked on Morning Reef, near a fly-ridden coast off Western Australia. Commander Francisco Pelsaert wrote in his diary about the nuisance presented by a fly, stating that they "infest the whole air".
The first European visitors to other southern continents recorded nothing resembling the bush fly, especially when shipwrecked. Pelsaert himself stopped at the southern tip of Africa, at what is now Cape Town, and found no flies there. A similar species, the eye fly (Musca sorbens), occurs in Africa and made life difficult for Australian soldiers at Tobruk. However, it has never been recorded in remote bushland or on offshore islands as small as the Houtman Abrolhos of Western Australia, where the Batavia survivors took shelter.
The introduction of cattle to Australia greatly benefited the bush fly, as they breed in animal dung. One large cow pat can produce up to 3000 flies. The density of flies increased to the point where they became iconic in the Australian landscape. The bush fly's major breeding sites before the development of agriculture in Australia were the faeces of humans, dogs, larger marsupials, and emus.
The Australian Dung Beetle Project was initiated in the 1960s to control the fly population by introducing dung beetles from overseas. This initiative has been successful in reducing the number of flies, along with better waste management practices in urban areas.
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Frequently asked questions
Yes, there were flies in Australia before white settlement. The first European visitors to Australia recorded the presence of flies, with Commander Francisco Pelsaert writing about the nuisance presented by a fly in 1629.
The types of flies present in Australia before white settlement included the bush fly, house fly, blow fly, and mosquito.
Before white settlement, the bush fly bred in human, dog, and emu faeces. However, the population of flies was much lower due to the sparse population of people and dingoes.
The introduction of cattle and the lack of native dung beetles to process their dung led to a significant increase in the fly population.
