Anyone who roams through the rainforest knows them: the small green paths of leaf fragments, carried by thousands of reddish-brown leafcutter ants (Atta). But hardly anyone knows: The leaves themselves are not eaten! 🍃 Instead, the ants chew the leaf material into a pulp – as a nutrient base for a fungus related to the common mushroom. This fungus is their actual food. So, leafcutter ants are: fungus farmers for over 25 million years.
A single nest can spread over 50 m², reach up to 8 meters deep into the soil, comprise 2,500 chambers – and be inhabited by up to 3 million ants! Annually, such colonies process up to 2 tons of leaf mass and bring it deep underground. This creates fertile soil – the basis for new plant growth. No wonder they are rightly called ecosystem engineers.
😕 But: Their passion for collecting has consequences. Even on our reforestation areas around La Gamba, these diligent harvesting professionals don’t stop – young, freshly planted trees are particularly vulnerable. For example, an entire citrus tree can be defoliated after just one night.
To find a solution that protects the trees without harming the ants, biology students from the University of Vienna started an exciting experiment:
💡 The idea: Leafcutter ants avoid their own waste – for good reason: it could contain pathogens that threaten their fungus gardens. So the students scattered fungus garden waste directly onto the ant trails.
🔬 The result: The ants changed course – the traffic stopped! A simple but ingenious method to protect young trees without disturbing the rainforest’s delicate balance.
🌿 Conclusion: Leafcutter ants are essential for healthy rainforest soil – but reforestation and ants must work together.
Next, it’s important to find out
whether waste from their own colony or another colony works better, how long the effect lasts, and what exactly deters the ants. With a bit of luck, this will soon lead to an easily implementable and nature-based protective measure that will ensure the survival of many seedlings in the future.
💚 A big thank you to the dedicated students who, with curiosity and a spirit of research, found a nature-based solution for our reforestation areas!
PURA VIDA!
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