- For other uses, see Ant
(disambiguation).
The ants, one of the most successful groups of insects, are of particular
interest because they form advanced colonies. They belong to the order Hymenoptera, and are close relatives of the sphecid wasps.
The first known ants appeared sometime during the Cretaceous period, and it is
believed that they evolved from the wasps that had appeared during the Jurassic
period. They are physiologically distinguished mainly by having six legs, sharply elbowed antennae, and by having a bead-like pedicel formed from the first few abdominal segments, which
in wasps are joined to the thorax. Ants are mostly wingless, which varies between individuals in a colony rather than between species.
Development
Ants are holometabolous, and develop by complete metamorphosis, passing through larval and pupal stages before they become adults. The larval stage is particularly helpless - for instance it
lacks legs entirely - because it does not need to care for itself. The difference between queens and workers, and between
different castes of workers when they exist, is determined by feeding in the larval stage. Food is given to the larvae by a
process called trophallaxis in which an ant regurgitates food previously
held in its crop for communal storage. This is also how adults distribute food amongst themselves. Larvae and pupae need to be
kept at fairly constant temperatures to ensure proper development, and so are often moved around various brood chambers within
the colony.
A new worker spends the first few days of its adult life caring for the queen and young. After that it graduates to digging
and other nest work, and then to foraging and defense of the nest. These changes are fairly abrupt and define what are called
temporal castes. In a few ants there are also physical castes - workers come in a
spectrum of sizes, called minor, media, and major workers, the latter beginning foraging sooner. Often the larger ants will have
disproportionately larger heads, and so stronger mandibles. In a few species the
media workers have disappeared, so there is a sharp divide and clear physical difference between the minors and majors, sometimes
called soldiers.
Most of the common ant species breed in the same way. All ants in the colonies are females to begin with, but only the Queen
and breeding females have the ability to mate. The male ants, called drones, along with the breeding females are born with wings,
and do nothing throughout their life except eat. At least, until the time for mating comes. At this time, all the breeding ants
in the colony are carried outside (save for the queen) where other colonies of similar species are doing the same. Then, all the
winged breeding ants take flight. Mating occurs in flight and the males die shortly afterward. The females, those that survive,
land and find a suitable place to begin a colony. There, they chew off their own wings and begin to lay eggs, which they care
for. The first workers to hatch are weak and smaller than later workers, but they begin to serve the colony immediately. They
enlarge the nest, forage for food and care for the other eggs. This is how a new colony starts.
Communication and behaviour
Ant communication is primarily through chemicals called pheromones. Because
most ants spend their time in direct contact with the ground, these chemical messages are more developed than in other
Hymenopterans. So, for instance, when a forager finds food on its way home (found typically through remembered landmarks and the
position of the sun), it will leave a trail along the ground, which in a short time other
ants will follow. When they return home they will reinforce the trail, bringing other ants, until the food is exhausted, after
which the trail is not reinforced and so slowly dissipates. A crushed ant will emit an alarm pheromone, that in high
concentration sends other ants nearby into an attack frenzy, and in lower concentration attracts them, while a few ants use what
are called propaganda pheromones to confuse their enemies.
Like other insects, ants smell with their antennae, which are long and thin. These are fairly mobile, having a distinct elbow
joint after an elongated first segment, and since they come in pairs they provide information about direction as well as
intensity. Pheromones are also exchanged as compounds mixed in with the food interchanged in trophallaxis, giving the ants information about one another's health and nutrition. Ants can also detect what
task group (e.g. foraging or nest maintenance) other ants belong to. Of special note, the queen produces a special pheromone
without which the workers will begin raising new queens.
Ants attack and defend themselves by biting, and in many species, stinging, in both cases sometimes injecting chemicals into
the target. Of special note here is formic acid.
Types
There is a great diversity among ants and their behaviors. See list of ant genera (alphabetical) for an alphabetical compendium of worldwide ant
genera.
Of special note:
- Some of the more advanced ants are the army ants and driver ants, from South America and Africa respectively. Unlike most species which have permanent nests, army and driver ants do
not form permanent nests, but instead alternate between nomadic stages and stages where the workers form a temporary nest
(bivouac) out of their own bodies. Colonies reproduce either through nuptial flights
as described above, or by fission, where a group of workers simply dig a new hole and raise new queens. Colony members are
distinguished by smell, and other intruders are usually attacked, with notable exceptions.
- Some ants will raid the colonies of other ants, taking the pupae with them, which once
hatched act as workers in the raider's colonies despite not being genetically related to the queen. A few species, such as the
Amazon ants (e.g. Polyergus rufescens), have become utterly dependent on such slaves, to the point of being otherwise unable to feed themselves.
- Some ants, called honeypot ants, have special workers called
repletes who simply store food for the rest of the colony, generally becoming immobile with greatly enlarged abdomens. In
hot, dry places, even deserts, in Africa, North America and Australia where they live they are considered a great delicacy.
- Weaver ants (Oecophylla) build nest in trees by
attaching leaves together, first pulling them together with bridges of workers and then sewing them together by pressing
silk-producing larvae against them in alternation.
- Leafcutter ants (Atta
and Acromyrmex) feed
exclusively on a special fungus that lives only within their colonies. They continually
collect leaves which they cut into tiny pieces for the fungus to grow on. These ants have
several differently sized castes especially for cutting up the pieces they are supplied with into even smaller pieces.
Symbiotic relationships with ants
- Aphids secrete a sweet liquid called honeydew. Normally this is allowed to fall to the ground, but around ants it is kept for them to collect. The ants
in turn keep predators away and will move the aphids around to better feeding locations.
- Myrmecophilous or ant-loving caterpillars (blues, coppers, or
hairstreaks) are herded by the ants, led to feeding areas in the daytime and brought inside the ants nest at night. The
caterpillars have a gland which secretes honeydew if the ants massage them.
- Some myrmecophagous (ant-eating) caterpillars secrete a pheromone which makes the ants think the larva is one of their own.
The caterpillars will then be taken into the ants' nest where they can feed on the ant larvae.
Humans and ants
Ants are useful for clearing out insect pests and aerating the soil. On the other hand, they can become annoyances when they
invade homes, yards, gardens and fields. Carpenter ants damage wood by hollowing it out for nesting. Nests may be destroyed by tracing the ants' trails back to
the nest, then pouring boiling water into it to kill the queen. (Killing individual ants is less than effective due to the
secretion of pheremones mentioned above).
Some species, called killer ants, have a tendency to attack much
larger animals during foraging or in defending their nests. Human attacks are rare, but the stings and bites can be quite painful
and in large enough numbers can be disabling.
Ants have often been used in fables and children's stories to represent industriousness and cooperative effort, as well as
aggressiveness and vindictiveness. In parts of Africa, ants are the messengers of the gods. Ant bites are often said to have
curative properties. Some Native American
religions, such as Hopi mythology, recognize ants as the first
people. Others use ant bites in initiation ceremonies as a test of
endurance.
Termites, sometimes called "white ants," are in fact not closely related to ants,
though they have a somewhat similar social structure. They comprise the order Isoptera.
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