Summary: Ants are such diverse organisms that extremes have evolved. Join Kiersten to learn about some ant extremes.
For my hearing impaired followers, a complete transcript of this podcast follows the show notes on Podbean
“Tales from the Ant World” by Edward O. Wilson
Music written and performed by Katherine Camp
Kiersten - This is Ten Things I Like About…a ten minute, ten episode podcast about unknown or misunderstood wildlife.
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.
In this penultimate episode I thought we’d talk about the extremes of ants. The fastest, the slowest, the fiercest, and maybe a few more. The ninth thing I like about ants is the extremes.
Edward O. Wilson studied ants for his entire life, give or take a few years when he was still in diapers, and that was 92 years. He discovered species we didn’t know about and described ant behaviors that boggled our human minds. It is no surprise that he included some of the extremes of ant life in his writings.
Something I had no idea about when I decided to pick ants as my next topic was that each species of ant has it’s own tempo. Not unlike music, this is the speed at which worker ants get things done. Some colonies are speedy as a tornado and others are as slow as molasses in winter, but they all get the job done. Each tempo fits the niche that a specific species fills in their habitat. Sometimes fast wins the race while other times slow persistence fairs better.
The fastest ants on Earth may very well be the workers of the genus Ocymyrmex. There are 34 known species in this genus and are found in most of eastern and southern Africa. Their chosen habitats are hot, hot, and hotter. Ocymyrmex, or swift ants, have streamlined bodies with very long legs attached with thick segments at the base. The mandibles are narrow and fit tightly against the head when folded. Their spiracles, air holes through which they breathe, are large. Ocymyrmex are built to be sprinters.
On a trip to Gorongosa National Park in Africa, Edward Wilson came across a colony of Ocymyrmex and wanted to grab a few for the Harvard University Lab. By this time in his career he’d caught a lot of ants, so he was well versed in the best ways to snatch a few specimens. The first obstacle he had to overcome was the extreme heat emanating from the mud flat on which the ants were running. It felt like a stove top, so kneeling down to catch some ants was going to be a challenge, but he was up for it. He positioned himself above the workers, readied his forceps, and caught not one single ant. The workers were just moving too fast. He could barely follow them with his own eyes much less grab them with forceps. A quote from his book Tales from the Ant World, “The ants were moving like a sizzle of water droplets in a frying pan, difficult even for the eye to keep track.” End quote. Those are some fast ants!
Ocymyrmex are made for sprinting but another ant, which is a double extremist, is made for marathons. Ants in genus Cataglyphis are long-distance runners and Cataglyphis bicolor is one of the most heat tolerant animals known to western science. These ants live in the Sahara desert and are mainly scavengers. They search for dead insects and other arthropods that have succumbed to the heat of the desert to dismantle and bring back to the nest.
Cataglyphis bicolor can withstand temperatures up to 158F, or 70C, but they must keep moving. If they stop, they fry. Talk about a good reason to keep moving.
Let’s look at the opposite side of tempo, the slowest ants in the world. Ants in genus Basiceros are as slow as ants can get without dying. These ants are found in Central and South America. They are not well studied and; therefore, poorly understood. The main problem is they are incredibly difficult to find. If you can’t find it, you can’t study it.
What we do know is Basiceros ants are medium in size and rely on their camouflage to survive. Their opaque brown color closely matches the fallen leaves and mold in which they live. They do hunt for food and like any other slow moving predator they are ambush predators. They simply wait for prey to come to them, lunge, strike, and seize it. They will stalk prey, as well, just at a very slow pace. If they are discovered by something, or someone, uncovering their hidden pathways under the leaf litter they freeze and will remain still for minutes at a time to protect themselves. Edward O. Wilson says of them, “Their tempo may be as slow as an ant species can employ and still survive.” End quote.
The Basiceros ants are also an extremist twofer. They are the slowest ants and also the dirtiest ants, which may be a linked trait. When Edward Wilson stumbled across some Basiceros in Costa Rica and transferred a colony to Harvard to study, they realized that the brown color of the ants wasn’t just camouflage to blend in with the dirt, it was dirt. The bodies of these ants are covered in coiled and feather-shaped hairs that essentially collect dust and debris. They use the dust and debris to hide amongst the leaf litter.
The colony of Basiceros studied at Harvard demonstrated this in an unexpected way. At the university, the colony that was brought back and housed in tunnels made of plaster of Paris. Within several weeks of living in the man-made tunnel the ants had turned white! They had replaced their dirt colored garments with the white plaster of Paris so they could blend in with their new habitat!
For the last extreme we will discuss lets’s look at timidity and fierceness, both serve ants well in different situations. Dolichoderus imitator is probably the most timid, or least offensive, ant in the world. This small ant lives in the Amazon rainforest of South America. Most colonies typically consist of a few hundred workers and a rarely seen queen. They nest in random cavities of decaying leaf litter and do not set up permanent colonies. If they are disturbed, by person or predator, they scatter in all directions. Nothing seems to be directed; although, they do pause long enough to pickup the closest larva or pupa to take with them. The individuals will shelter in any covered place they find nearby waiting for the danger to pass. The colony will reconvene in another random clump of leaves elsewhere. Maybe the transience of their nests breeds timidity for survival reasons.
On the other side of the coin is fierceness. There are several candidates for the fiercest ants in the world. Our first candidate is the bull ants from Australia. They are in the genus Myrmecia and the largest workers are the size of hornets. They nest in craters of soil and are not intimidated by any creature that comes near, including something as big as a human. Edward Wilson has seen them lock their large eyes onto an animal simply walking by the nest. Sentries will turn and watch and if you come close, they walk toward you. If they catch you, you will regret it. When the interloper makes the correct decision to leave, they follow up to 10 meters, or 32 feet, to make sure you don’t come back.
Bull ants are pretty scary due to their size, but ants that live in symbiosis with a specific bush or tree are even scarier, especially if you come in contact with them in their home. The guardian ant, Pseduomyrmex triplar, are found in palo alto trees common in Colombia. In 1770 Jose Celestino Mutis happened upon these ants in an unpleasant encounter. He paused under a palo alto on a hot sunny day and quickly found himself covered in red ants that were continuously stinging him. There were so many and they were stinging so fiercely that he had to remove all of his clothes and jump into the nearest body of water.
Edward Wilson gives his vote for most ferocious ant to the tree-dwelling Amazon ant Camponotus femoratus. These ants are also know as the epiphyte garden-ants. They live in the trees and use soil and vegetable detritus gathered from the ground and surrounding branches to build spherical ant-gardens around certain species of epiphytes. Epiphytes are plants that grow on the surface of another plant but does not harm the host plant. The ants’ nest is held together in part by the roots of the epiphyte. A quote from Edward Wilson’s book Tales from the Ant World tells us all we need to know about why he voted these as the fiercest ants in the world. Quote, “When I turned and walked downwind toward the colony, a swarm of workers erupted almost instantaneously. As I came closer, but still without touching the nest, the defenders went berserk. Piling up on top of one another, they reached out toward me with the abdomens of many pointing in my direction and spraying a cloud of formic acid.” End quote. I see what he voted the garden ants as the fiercest ants in the world!
There are many more extremes in the ant world, but I have already gone over time for this episode. I’m glad you joined me for my ninth favorite thing about ants, their extremes.
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Join me next week for another exciting episode about ants.
This has been an episode of Ten Things I like About with Kiersten and Company. Original music written and performed by Katherine Camp, my very own piano playing hero.