Surely, on some occasion, we have thought that flies have no use beyond being annoying. However, although they can interrupt our comfort, the importance of flies in ecosystems is fundamental for natural balance. Although their appearance and behavior may be unpleasant, the function of flies extends far beyond what we imagine.
In this article we will delve into the role of flies in ecosystems and why their role is essential in maintaining biodiversity.
Main characteristics of flies
Flies, members of the order Diptera, have a number of notable features that make them unique. One of the main peculiarities of flies is the presence of compound eyes, made up of thousands of individual facets that allow them to discern light and move quickly when they detect danger.
Another peculiarity of flies is that their legs are articulated at three points, which allows them to clean their mouth and eyes in the characteristic way we usually see them. The body of a fly is divided into three parts called tagmas: head, thorax and abdomen.
Interestingly, although they are insects, flies do not have antennae, which sets them apart from many other insect species. Instead, they have two functional wings and two smaller wings called halteres, which provide balance during flight. As for their mouths, they are designed for sucking, licking, or piercing, depending on the species, although they cannot bite or chew in the conventional sense.
As for fly species, more than 50,000 species have been identified in our country. Worldwide, the number is much higher, as new species are always being discovered.
Flies have a short but active life cycle. Their breeding period begins around March and extends through August, when temperatures are more favourable. During these months, flies can reproduce in their millions. In winter, they do not disappear or hibernate; rather, they slow down their life cycles until the weather is favourable again.
Under optimal conditions, a fly can live up to 60 days. As adults, flies can fly, feed and reproduce quickly. They will have previously gone through other developmental stages, such as eggs and larvae, depending on the species of fly in question.
Role of flies in ecosystems
The role of flies in ecosystems is much more important than is often imagined. These insects play a crucial role in several ecological processes, serving as pollinators, decomposers of organic matter and, in many cases, as pest controllers. They also act as a vital food source for insectivorous animals.
Efficient pollinators
As with other, more highly prized insects such as bees, many fly species play a crucial role in pollination. As they move from flower to flower in search of food, pollen sticks to their legs and other body parts. This pollen is then carried to other flowers, facilitating cross-fertilization.
Although they are not the main pollinators on the planet, flies contribute significantly to the pollination of several plant species. This is particularly important in cold or high mountain areas where bees are not present, but flies can survive and carry out their pollination task.
A prominent example is their role in the pollination of cocoa plants, where certain species of small flies, known as midges, are responsible for fertilizing cocoa trees. Without their activity, chocolate production would not be possible.
Vital decomposers of organic matter
Another fundamental role of flies is their role as decomposers of organic matter. In their larval stage, many flies are considered saprophagous, which means that they feed on decomposing organic matter such as animal carcasses, feces or plant remains.
This process is essential to reduce biological waste and return nutrients to the natural cycle. Without these larvae, decomposing matter would accumulate in large quantities, making it difficult to recycle nutrients in the soil. Flies, by transforming organic matter into elements beneficial to the soil, act as natural fertilizers.
This process is also critical for sectors such as agriculture, where many flies help in the biodegradation of waste that could otherwise harm the agricultural environment.
Pest control and its role in the food chain
One of the lesser-known but most important functions of flies is their role in natural pest control. While some flies feed on decaying organic matter, other species feed on insects that are considered pests, such as mites or aphids.
In this way, flies help regulate the populations of these harmful insects, preventing them from reproducing excessively and damaging agricultural crops or natural ecosystems.
Flies are also an essential part of the food chain, serving as food for a wide variety of insectivorous species, from birds and reptiles to amphibians and other insects. This biological balance is vital for the proper functioning of ecosystems.
Scientific use of flies in the laboratory
One of the most fascinating aspects of the fly is the role it has played in scientific research, particularly in the field of genetics. The fruit fly (Drosophila melanogaster) has been used for over a century to study genetics and other biological processes.
Thanks to its short life cycle and simple breeding conditions in the laboratory, Drosophila has been essential to the development of major scientific discoveries about genetic inheritance, circadian rhythms and even studies on human diseases such as Parkinson's. These advances would not have been possible without the incorporation of the fly in thousands of research projects around the world.
What would happen if flies disappeared?
If flies were to cease to exist, the ecosystem could face catastrophic consequences. Firstly, as primary decomposers of organic matter, their disappearance would lead to a massive accumulation of organic waste such as carcasses and feces. This would affect not only soil fertility, but also the health and balance of ecosystems in general.
Not only that, insectivorous animals that rely on flies for food would also be severely affected, thus breaking the food chain in many ecosystems. Likewise, pollination of certain crops and plants would also decrease.
Without flies, ecosystems would partially collapse, and many natural functions would slow down, affecting not only the environment but also agriculture, biodiversity and possibly human health globally.
So, although they may seem insignificant or annoying, flies are actually an essential part of ecosystems. They perform key functions that ensure the sustainability and balance of natural systems, so we should value their existence.