Ant Development Communication And Behaviour Types

The ants, one of the most successful groups of insects, are of particular interest because they form advanced coloniesAn ant colony is an underground lair where ants live. Colonies consist of a series of underground chambers, connected to each other and the surface of the earth by small tunnels. There are rooms for nurseries, food storage, and mating. The colony is built. They belong to the order Hymenoptera, and are close relatives of the sphecid waspA wasp is any insect of the order Hymenoptera and suborder Apocrita that is not a bee, sawfly, or an ant. Less familiar, the suborder Symphyta includes the sawflies and wood wasps, which differ from the Apocrita by having a broad connection between the ths. It is believed that the first known ants appeared sometime during the later CretaceousThe Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 135 mya) to the beginning of the Paleocene epoch of the Tertiary period (65 mya). The end of the Cretaceous also defines the period. They are physiologically distinguished mainly by having six legs, sharply elbowed antennaeAntennae (singular antenna , are the paired appendages connecting to the first (and in crustaceans also to the second) segment of the head of the members of all subphyla of the arthropods except Chelicerata. Also the members of the order protura lack them, and by having a bead-like pedicelalso spelled pedicle 1. BOTANY stalk of individual flower: a stalk bearing a single flower or spore-producing body within a cluster 2. ANATOMY stalk-shaped body part: an anatomical part that resembles a stem or stalk 3. INSECTS narrow segment: a narrow an formed from the first few abdominalThe abdomen (from the Latin word meaning "belly") is the part of the body between the pelvis and the thorax. The front of the abdomen is the abdominal cavity, which is separated from the thoracic cavity by the diaphragm. The lining of the abdomen is calle segments, which in wasps are joined to the thorax. Ants are mostly wingless, which varies between individuals in a colony rather than between species.

1 Development

Ants 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, where an ant regurgitates food held in a 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.

2 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 her 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. These are fairly mobile, having a distinct elbow joint after an elongated first segment, and since they come in pairs 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) each other belongs 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.

3 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 ant s ( 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.

4 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.

5 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.

6 See also

British ants
Red Imported Fire Ant
Rare ants of the British Isles
List of the common names of British ant species
List of ant genera (alphabetical)
List of notable myrmecologists
Myrmecology: the study of ants
Ant-hill
Anting (bird activity)
The Ants
Journey to the Ants
SimAnt
Antpower
Langton's ant for articles concerned with subjects that use the word "ant"

7 External links

Myrmecology insects

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