Without flies, your favorite chocolate and summer stir-fries might disappear
In short: Most people view flies as pests to be swatted, but these insects are essential architects of our ecosystems. From cleaning up organic waste to pollinating vital crops, the true flies, or Diptera, perform biological services that keep our planet—and our dinner plates—functioning.
While flies often suffer from a poor public image, their ecological contributions are indispensable. As larvae, or maggots, they act as primary decomposers, breaking down and redistributing organic matter. This process recycles nutrients back into the soil, providing essential nourishment for plants and other organisms. Without these decomposers, the natural world would struggle to manage dead bodies and waste. Furthermore, many fly species serve as a foundational food source within global food chains, sustaining animals ranging from fish and birds to amphibians and spiders.
The group known as Diptera exhibits incredible evolutionary diversity. Their basic body plan includes three pairs of legs, a single pair of wings, sucking mouthparts, and halteres—modified hind wings used for balance during flight. While most species must consume liquids, their mouthparts vary from disc-shaped 'hoovers' to incredibly long tubes. For instance, the species Moegistorhynchus longirostris possesses a proboscis so long relative to its size that, if scaled to a human, it would measure six metres. This specialized anatomy allows it to reach nectar deep within trumpet-shaped flowers in southern Africa.
Beyond decomposition, flies are vital pollinators. Biting midges are among the few pollinators for chocolate, meaning the loss of these flies would directly impact cocoa production. Additionally, more than 100 cultivated crops rely on various flies for pollination, including apples, strawberries, carrots, onions, bell peppers, black pepper, and coriander. However, the relationship is complex; while many are beneficial, certain species act as agricultural pests or vectors for diseases like malaria, Zika, and yellow fever, illustrating the nuanced role flies play in our lives.
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Sources
- Summary by Intellect · source: Why do we need flies? | Beneficial animals and insects | Gardening Australia
- Also: Flies: The compelling case for why they’re actually fabulous | Natural History Museum
- Also: Why are flies important? | Britannica
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