Tag Archives: rafts

Living Rafts Carry Fire Ants to Safety

Huckleberry Finn was an amature raft builder and river rafter, when compared to Red Imported Fire ants.

As fire ants are flooded out of their underground nests, they hold onto each other for dear life, forming a fire ant flotilla that allows them to survive. Actually, they hold themselves together by linking mandibles (mouth parts) to the legs of other ants and locking leg to leg to mouth to leg.

Instead of scattering, with every ant for him or herself, red imported fire ants (Solenopsis invicta) have the unique ability to gather together as a colony and form living rafts on the surface of rising flood waters.

TheCoz [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)]
TheCoz [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)]
Their rafts are so tightly woven together, that water cannot penetrate the raft. This structure also holds a layer of air, called a plastron layer, tightly around the raft. The plastron layer (air bubble) facilitates buoyancy and keeps ants on the bottom of the raft (those underwater) alive. This unique “air bubble” and a waxy coating on their bodies allows these ants to stay afloat for weeks if necessary, so that they have a fighting chance to reach dry land and save their colony.

To make sure the colony survives, the queens and their eggs (there can be one or more queens in a colony), are given the driest accommodations on the raft, near the center.  The raft itself is in constant motion, with ants moving across the top and joining the stationary layer on the bottom.  In this way the raft is kept in tip top condition.

Scientists don’t really know why some ants get to be the bottom raft crew, but it seems that there is some indication that this is not a voluntary position.

The colony must survive. So while floating down the river on natures currents, these ants are constantly searching for new and safe places to set up housekeeping.

So, what do these ants do when they finally hit dry land?  Abandon ship of course!

USA, TX, Travis Co.: Austin.Tom Hughes Park.12-xi-2016
USA, Travis Co..Tom Hughes -2016

 

All ashore that going ashore! ant-warning-danger-44575_960_720

Ant Facts:

The South American or Red Imported fire ant (Solenopsis invicta) was initially introduced into Southern California in 1998 (Orange imported-red-fire-antCounty) and is a major concern as an invasive species. It is similar in general appearance to our native southern fire ant (S. xyloni), except the head and thorax of the red imported fire antsouthern-fire-ant-jpeg is a little darker and their dirt excavations for colony sites are much larger, almost the size of gopher mounds!fireant-nest

The sting of both species of fire ant is about the same pain level, and leaves a raised reddish welt, especially in tender areas.  A single bite or sting is not pleasant but watch out for a whole colony may decide to attack at once if a threat to the colony is perceived and this can be a definite health concern as they can inflict significant damage and a whole lot of fiery pain.

With the amount of rain and snow, in California this year, and the extensive number of areas destroyed by fire, flooding is a major problem for we humans and animals alike.  You can be sure, as we deal with disastrous flooding, Fire Ants will be industriously building rafts, and river rafting their way to safety and, like Christopher Colombus,  new lands to colonize.

Here’s a cartoons about fire ants.  Want more? Click Here!

fire-ant-cartoon-with-ant-eaters

Ants, Nature’s Engineers: Creativity by Necessity.

Ants are one of the few groups of animals which change their environment to meet their needs.  In their case, necessity is truely the mother of invention.

A single ant is  capable of carrying up to 50 times its own weight, so working together as a colony means they’re able to accomplish impressive and seemingly impossible feats. In fact,  a large army of garden ants can construct an underground city big enough to house thousands of insects, within one week.

Ant nant-nest-flatests come in all shapes and sizes. Many species build their colonies underground, but not all. Some build above-ground mounds, while others build colonies in trees.  Some ants will even build a colony within the walls of a building. The exact structure and whereabouts of the nest varies with the species, soil type and situation.

Ants are industrious creatures and excellent builders. Here are a few of their amazing constructs.

Anthills: These nests are created as a by-product of worker ants digging underground tunnels. In fact, ants in general move more ant-hill-in-forrestearth (soil) than any other organism, including earthworms. As the worker ants excavate the colony’s tunnels, they dispose of the displaced earth by carrying it back out of the colony and depositing it near the entrance. They also get rid of any garbage found in the colony in this way. They carry these tiny bits of dirt and garbage in their mandibles. Usually, this combination of materials is dropped off at the top of the anthill, so it does not slide back down the hole into the colony.  Some species of ants work hard to create a specific shape to their anthills.

Tree Nests:  Some ants, such as the Carpenter Ant, build their nests carpenter-antby hollowing out rotting wood; they do not eat the wood. Workers take mouthful-sized chips of wood to the nest entrance, where they deposit the chips. This results in a pile of sawdust at the base of a tree. The nest itself consists of meandering tunnels that are free of sawdust. Nests may be present in rotting wood in trunks, limbs, or roots and even wooden fence posts.

There are a few ant species whose nests are constructed using leaves. The green tree ant (Oecophylla smaragdina) sews together weaverantsnestleaves with the silk produced by their larvae. The colony expands by enlarging existing leaf nests or by adding new satellite nests. Other species use plant fibers to construct coverings which are attached to the surfaces of leaves. These ants live within the chamber formed by the covering and leaves.

Rafts:  During floods and heavy rainstorms, passageways and chambers within underground ant nests fill with water and force the evacuation of the colony.  Fire ants have the unique ability to come together as a colony and build an “ant raft” using their own bodies. ant-raft-of-fire-antsWhen waters start to flood the colony, worker ants link legs and mouths together, weaving a raft in a process that can take less than two minutes.  The fine hairs on the ants trap enough air that those on the bottom layer of the raft avoid being completely submerged. Fire ants can survive in a raft up to several weeks, although they eventually to need reach dry land if they are to restart their colony.

Towers: Fire ants build complex towers as a means of avoiding

Candler Hobbs, Georgia Tech.
Candler Hobbs, Georgia Tech.

trouble.  Without any planning, using trial-and-error and only their own bodies, they create a bell-shaped tower structure that helps them survive. According to one study, an individual ant, can support as many as three other ants, which it connects to using sticky pads on its feet. Scientists think that their towers act like makeshift shelters until the ants can build more safe and durable accommodations.

Rules for building ant towers:

  1. Don’t move if there are other ants on top of you.
  2. If you are on top of other ants, keep moving you’ll find your spot.
  3. If you find an open parking spot next to other immobile ants, pull in and link up with your neighbors.

Bridges: Army ants build living bridges, moving ant-bridgehundreds of thousands of ants daily. They are creating shortcuts through their environment saving time and energy, and optimizing traffic flow. Other ant species form structures out of their bodies, but their constructs are not such a huge part of their lives and daily behavior as is the bridge building of the army ants.  Building “living” bridges across breaks and gaps in the forest floor allow their notoriously large and vicious raiding swarms to travel efficiently.

Fun Facts about Ants: On the order of 10 quadrillion ants live on the planet at any given moment. That’s about 1.4 million ants per human, based on a world population of 7.3 billion people.