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Ants: Farmers

Ants: Farmers

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 Summary? Can ants be farmers? Join Kiersten to find out! For my hearing impaired followers, a complete transcript of this podcast follows the show notes on Podbean Show Notes: “Tales from the Ant World” by Edward O. Wilson “Adventures Among Ants” by Mark W. Moffett Music written and performed by Katherine Camp Transcript (Piano music plays) Kiersten - This is Ten Things I Like About…a ten minute, ten episode podcast about unknown or misunderstood wildlife. (Piano music stops) Kiersten - Welcome to Ten Things I Like About… I’m Kiersten, your host, and this is a podcast about misunderstood or unknown creatures in nature. Some we’ll find right out side our doors and some are continents away but all are fascinating. This podcast will focus ten, ten minute episodes on different animals and their amazing characteristics. Please join me on this extraordinary journey, you won’t regret it. Can ants be farmers? In this episode we are going to find out. The sixth thing I like about ants is their farming abilities. You may have heard of leafcutter ants. These are ants that cut leaves and carry them back to their colony. They are often highlighted in nature television programs. It’s mesmerizing and charming watching a line of ants traveling with various sizes of leaf pieces held above their heads. Leafcutters will fall into one of two genera: Acromyrmex and Atta. There are 39 species that we currently know of and they are all found in the New World. Atta are most prevalent in the tropics of South America but there are two species that can be found in North America, one in Texas and Louisiana and one in Arizona. Leafcutter ant nests can extend 7 meters, or 22 feet, into the earth and contain eight thousand chambers. The largest chamber is typically the ant waste chamber which is buried as far down as they can make it. The title of this episode is farmers so how does that relate to our leafcutter ants? Well, leafcutter ants are farmers. I used to think that they cut those little pieces of leaves to eat themselves, but that is not what they are doing. They take the leaves back to their nest where they feed it to fungus. They tend the fungus like farmers and then they eat the fungus, or rather the larvae eat the fungus. So I guess every leaf cutter ant eats the fungus at some point in their life. The adult workers ants eat the sap from the leaf fragments that they cut. This is what energizes them to process the leaves. The leaves have to be mulched first before it is fed to the fungus. The fungus will grow and grow and grow in the leafcutter nest. It will fill up the majority of the chambers with a lightweight spongy structure that kind of looks like a human brain and is called a fungus garden. The ants tend the fungus by adding new leaves to the top and sides while they removed the older bottom portions. It is unusual that ants are completely dependent on vegetation, but leafcutter ants are. The fungus is actually high in protein and that helps the larvae grow big and strong. The largest nest that Mark Moffett ever came across during his studies was in the Kaw Mountains of French Guiana. The above ground soil mounds were chest high and ranged over a 14 meter wide area. It ranged over about 160 square meters in total. If we compared this to a human made structure, it would be bigger than the Empire State Building in New York City. This nest probably housed millions of workers. A nest of this size can require an excavation of 40 tons of soil. It must house the queen, the brood, and the workers but even with millions of ants it’s the fungus gardens that take up most of the real estate. The ant population can weigh up to 15 to 20 kilograms and utilize 280 kilograms of leaves. That’s enough plant matter to blanket a soccer field. Now, this is a lot of living things inside an enclosed space, so it gets hot and humid. To combat increasing heat and humidity which slows down fungal growth, the ants have installed air conditioning ducts. The long tunnels that open above ground are placed strategically around the nest to release humidity and heat. If it get too cold, the tunnels will be closed off. The only reason leafcutter ant nests can support millions of workers is because they are farmers. Just like humans, farming allows the ants to support a larger population by creating their own resources. These ants use incredibly advanced farming techniques. Humans will use various farming equipment to produce large quantities of crops, but for leafcutter ants its all hands on deck. The ants within this species are highly polymorphic, meaning sizes between workers vary greatly depending on your job. The largest soldier ant is 200 times bigger than that of a small worker. These colonies are run like assembly lines of self-directed individuals. Many steps are managed by ants in a variety of sizes. Mid-size workers cut the foliage, carry it into the nest, and deposit it onto the garden ...
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