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Ants: Ranchers

Ants: Ranchers

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 Summary: We know ants are farmers, but are they also ranchers? Join Kiersten to find out! For my hearing impaired followers, a complete transcript of this podcast follows the show notes on Podbean Show Notes: “Adventures Among Ants” by Mark W. Moffett “Trophobiosis is a tropical rainforest on Borneo: Giant ants Camponotus gigs (Hymenoptera: Formicidae) herd wax cicadas Bythopsyrna circulate (Auchenorrhyncha: Flatidae),” by Martin Pfeiffer and Karl Eduard Linsenmair “Aphid-farming ants,” by Annie B. F. Ivens and Daniel J. C. Kronauer “Ecological consequences of interactions between ants and honeydew-producing insects,” by John D Styrsky and Micky D. Eubanks 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. Two episodes ago we found out that ants are farmers, at least some species of ants are farmers and they are amazingly well organized and productive farmers. The other side of sustained food production is ranching. Ranching is a form of agriculture focused on raising livestock for various uses. Are ants ranchers? Let’s find out! The eighth thing I like about ants is their ranching activities. For those of you listening in order, last episode we learned about the Weaver ants of Africa that live in trees. They are some of the coolest ants out there with special physical adaptations and behavioral adaptations that help them survive in the tree. One of the activities I didn’t talk about, because I was saving it for this episode, is their ranching. The weaver ants, Oecophylla longinoda, use other insects as a form of food resources. Now they do hunt other insects and tear them apart and eat the bits, but they also corral certain insects and use the honeydew that those insects produce as food. Mealy bugs, plant hoppers, and scale insects are some of the “cattle” that Weaver ants utilize. These insects are all sap-sucking species that tap a plant for it’s sap and drink it. The ants love the honeydew, or doo-doo, that comes out the other end of these insects. Yes, that’s correct, the ants are eating their excrement which is actually more nutritious than nectar. The Weaver ants are protective of their livestock keeping them from harm and moving them to fresher pastures, just like human cowboys. They often build leaf tents over and around their charges keeping them hidden from predators and controlling their movements so they can gather the honeydew for as long as the insect lives. Who knew ants were ranchers? It’s not only Weaver ants that exhibit this behavior. Some species of Formica ants are also ranchers. They will tend similar insects as the Weavers including Mealy bugs, plant hoppers, scale insects as well as whiteflies and aphids. I found several papers talking about the relationship between Formica ants and aphids. They really treat these aphids like humans treat cattle. The ants tend them, watching them to protect them from predators, they will pick them up and remove them from a plant when danger arises (okay humans can’t pick up cattle, but we can escort them to another area when needed), and when the part of the plant that the aphids are eating from begins to run dry the ants will take them to greener pastures. The ants are after the honeydew, of course, the excrement from the aphids, just like the Weaver ants. It is high in concentrated sugars and carbohydrates that keep the ants running. Giant ants, Camponotus gigas, from the tropical forests of Borneo herd wax cicadas. They are incredibly well organized in their herding and perform three behaviors to help gather as much honeydew from these cicadas as possible. Some of the ants are collectors and spend about 80% of their time sitting below the cicadas to collect the honeydew as it comes out. Ants that spend their time collecting often focus on one cicada, returning to the same individual after each collection. There are also secondary gatherers that collect honeydew from the body parts of the primary collectors and receive honeydew via trophallaxis, or passing of regurgitated liquids to another insect. This allows the primary collectors to spend more time collecting directly from the cicadas. The secondary gatherers take the collected food back to the nest. A third worker might sometimes stand in front of the cicada and perform what the researchers called “antennating from ahead”. One or more ants will sit in...
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