Because the ants need to eat
Very good for leaf cutter ants. They bring cut leaves back to their nest, chew them into tiny pieces and use them as a substrate to grow fungi which they feed to their larvae and eat themselves.
Leafcutter ants are known for their unique farming behavior, where they cultivate and consume a specific fungus that grows in underground gardens. They feed primarily on the fungal biomass, using it as their main food source. This symbiotic relationship between ants and fungus has evolved over millions of years and plays a vital role in the ecosystem.
Leaf cutter ants live in subterranean colonies, where they have chambers that contain their fungus gardens. They forage above ground to cut leaves to bring back to the colony to cultivate more fungus. These ants are native to Central and South America but there are some species that can be found as far North as Texas in the United States.
It is a mutualistic relationship if both organisms benefit, commensalism if one benefits and the other gets nothing, and parasitic if one benefits and the other is harmed.
The relationship between fungi and ants mostly involve the ants actively cultivating the fungus in the same way a farmer cultivates crops. The fungus, in turn, provides nutrients for the ant colony.
Leaf cutter ants do not feed on live plant material; instead, they use the leaves to cultivate a fungus that serves as their primary food source.
Leaf-cutter ants are also known as parasol ants due to their unique behavior of carrying leaf fragments above their heads, resembling small parasols. These ants cut leaves and transport them back to their colonies, where they use the foliage to cultivate a specific type of fungus, which serves as their primary food source. The leaf-carrying behavior, along with their symbiotic relationship with the fungus, is a defining characteristic of these fascinating insects.
Food source and pest protection describe the respective ways that leaf cutter ants and fungi benefit from their relationship. The relationship gets called mutualism because the interaction does no harm to either party. Leaf cutter ants inoculate leaves with fungi before colony meals and supply bacteria from their skins to protect the fungi from lethal pests.
Most people think that Leaf-Cutter Ants eat, well, LEAVES, but, that is wrong. As their name suggests, they DO cut leaves, but when they get to the colony, they grind the leaves to a pulp and use it as a natural fertilizer for the FUNGUS that they eat.
Leaf cutter ants go out to collect pieces of leaves that they cut off, then take what they have collected back to the nest. In the nest special worker ants prepare the leaf to grow a special fungus that grows into little lumps that the ants feed on. So you can see that what the ants eat is not flesh, but bits of fungus that they grow, much as humans grow mushrooms for food. So we say that they are not carnivores, but fungivorous or mycophagous, two words that mean the same thing: "fungus-eating".
The fungus that grows in gardens created by ants from cut leaf disks is known as Leucoagaricus gongylophorus. This mutualistic relationship benefits both the ants and the fungus, as the ants cultivate the fungus for food, while the fungus breaks down the plant material and provides nutrients for the ants. The ants meticulously tend to the fungus, ensuring its growth and health within their nests. This fascinating interaction exemplifies the complex relationships found in nature.