Red harvester ant

Pogonomyrmex barbatus
P. barbatus worker from Texas, United States
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Myrmicinae
Tribe:	Myrmicini
Genus:	Pogonomyrmex
Species:	P. barbatus
Binomial name
Pogonomyrmex barbatus Smith, 1858

Pogonomyrmex barbatus is a species of harvester ant from the genus Pogonomyrmex. Its common names include red ant and red harvester ant.^[1] These large (5–7 millimeters) ants prefer arid chaparral habitats and are native to the southwest United States.^[2] Nests are made underground (up to 2.5 meters deep) in exposed areas. Their diets consist primarily of seeds, and they consequently participate in myrmecochory, an ant-plant interaction through which the ants gain nutrients and the plants benefit through seed dispersal. Red harvester ants are often mistaken for fire ants, but are not closely related to any fire ant species, native or introduced.

Colonization

Red harvester ant nests are characterized by a lack of plant growth and small pebbles surrounding the entrance to the tunnel, which usually descends at a pronounced angle. Hulls of seeds may however be found scattered around the nest. In grassland areas, such as ranches, the lack of plant life makes red harvester ant colonies very easy to spot, and where they are very plentiful they may make serious inroads into the grazing available to livestock.

The mounds are typically flat and broad, 0 to 100 mm (0.0 to 3.9 in) high, and 300 to 1,200 mm (12 to 47 in) in diameter. There have been reports of even larger denuded areas, on the order of 10 m² (110 sq ft). Three to eight trails typically lead away from the mound, like "arms". These trails are used by ants to collect and bring food back to the mound. "Scout" ants are the first ones out of the mound every morning. They seek food, and mark their path as they return to the mound to alert the worker ants. The worker ants follow the scent trail and collect the food. Other worker ants clean, extend and generally tend to the mound, the queen and the brood. All the ants in the colonies are females apart from the winged males produced in the breeding season.

Initial colony formation

The reproductive unit of ant populations is the colony. A single virgin queen first mates with several males at a reproductive aggregation site formed by male harvester ants. She then flies to a new site to produce an offspring colony.^[3]

Diet

The main food source for red harvester ants usually consists of seeds, which they hoard in great numbers. The food is first ground to a bread-like consistency using the ant's large mandible, and is then stored in a granary, assuring the colony access to food year-round. Seed collection on behalf of the red harvester ants benefits their ecosystem through the process of myrmecochory, in which ants aid in the dispersal of seeds while foraging for food. Both plant and ant benefit from this relationship: the plants increase their dispersal range and density, while the ants benefit from acquiring nutrients and ensuring a more secure food supply in future harvests. This is typically understood as a mutualistic interaction. Dead insects are also collected during foraging.

Red harvester ants

Foraging

Much research has been done on the foraging behavior of the red harvester ant. Three types of workers are most involved in the foraging process: nest patrollers, trail patrollers, and foragers. On a given day, nest patrollers emerge first from the nest to assess the safety and profitability of foraging. The colony gets the majority of its water from the metabolism of the fats in seeds.^[4] If food is scarce, or if it is a particularly hot day, the energy and water benefits of foraging may be outweighed by its energy and water costs. In this case, the colony may be forced to rely on its extensive food stores. Seeds may be stored in the nest for months or even several years.^[5]

The colony is able to communicate through momentary antennal contact involving the transfer of cuticular hydrocarbons.^[6] Other visual, temporal, and olfactory cues may also be involved.^[6] Based on the nest patrollers’ reports, trail patrollers may leave the nest to determine the best possible foraging direction. This decision is based upon various economic factors such as food availability and neighboring nests’ foraging behavior. As both types of patrollers return, foragers assess their rates of return to decide whether to leave the nest to find food. In an experiment involving patroller mimics, it was found that a return rate of 1 patroller every 10 seconds stimulated the highest level of foraging activity.^[6] This return rate indicates high availability of food and good foraging conditions, and therefore a favorable cost-benefit ratio for the foragers. If the patroller return rate is too high, it may be a warning of danger, such as the sighting of a predatory lizard. A lower return rate could indicate lack of available food, or heavy competition

Ant foraging is guided by chemical signals that lead the ants up to 50–60 m (?) from the nest at times.^[7] Once an ant has decided to forage, it will almost always continue until it has found food to take back to the nest. 90% of returning foragers are “successful”.^[8] Therefore, forager return rate is a good indicator of food availability. Logically, overall foraging activity is influenced by the rate of returning foragers.^[8] When food is plentiful, foragers will quickly find it and immediately return to the nest. Foragers still in the nest will interpret this to mean food searches will be profitable: low energy input with a high chance of a seed reward. Foraging activity will consequently be increased. Likewise, a decline in food availability, indicated by a decrease in forager return rate, will cause the colony to decrease its foraging activity.^[6]

The ability for a colony to quickly regulate its foraging behavior is quite important since their food source is variable and scattered. This regulatory ability is variable in itself, influenced by food availability, current need to eat, and colony health.^[2] Colonies are more likely to adapt to varying forager return rates when the rate of foraging is high, which may be because variances are simply harder to detect during low rates.^[2] Overall, the red harvester ant demonstrates a remarkable ability in social cognition, cost-benefit analysis, and behavioral economics.

Collective regulation

Harvester ant populations operate without a centralized control system by means of a decentralized chemical communication system, through the process of chemical signalling. Foraging is regulated using positive and negative feedback loops. When ants return to the colony, this stimulates outgoing foraging. When ants return to the colony at a higher rate with seeds, this in turn causes the outgoing rate of foragers to increase. As fewer ants bearing seeds return to the colony, the rate of outgoing foragers decreases. The result is foraging regulation relative to the abundance of available food at any given time.^[9] The interactions between returning and outgoing foragers operates on a timescale of seconds. It typically only took three to eight seconds for an outgoing forager to leave the nest as a result of an increase in successful returning foragers.^[10]

Relative abundance of food available is gauged by the average time spent foraging per seed, rather than the distance traveled to find each seed. Foragers take less time when food is more abundant. Faster foraging signals faster rates of outgoing foragers, maximizing the harvest of food relative to the abundance in the area. Seeds are used as a source of water for ants, and are often kept in the nest for anywhere from a few months to multiple years.^[11]

Interference competition in foraging

Interspecies competition exists between harvester ant populations, presenting challenges to successful foraging. One example of this is the competition for access to seed resources between the Novomessor cockerelli and Pogonomyrmex barbatus species of harvester ants. Novomessor cockerelli ants engage in interference competition against Pogonomyrmex barbatus colonies by "plugging" entrances to the nest with sand and small rocks. This delays activity of P. barbatus for anywhere from one to three hours, shifting the onset of foraging until later in the day when the temperature is substantially higher. This reduces productivity in two ways; firstly, the ants are delayed and consequently have less time to forage; secondly, high soil temperatures prematurely drive harvest ants back into their nests, shortening the range of possible foraging. Research indicated that the affected Pogonomyrmex barbatus populations did not take efforts to compensate for the interference in their activities, such as by inducing higher rates of foraging. As such, nest plugging by rival species impedes the overall productivity of worker ants in the species Pogonomyrmex barbatus.^[12]

Division of labor

Caste system

Red harvester ants are eusocial insects, characterized by a high-level of cooperation and an organized division of labor. The worker caste is sterile. As with most ant species, reproduction is performed by a mating caste that consists of winged alates (reproductives) that reside in the nest until weather permits them to fly away and mate. After copulation the male usually dies, while the now-fertilized queen returns to the ground to search for a suitable nesting site. Once she has chosen a site, she sheds her wings and begins to reproduce, creating a new colony. She produces "worker ants" for 1–20 years until her death. Some Queens have been known to live up to 30 years in the wild.

In Pogonomyrmex barbatus, reproductive and non-reproductive tasks are divided into a caste system, as discussed above. Some individuals are specialized for reproductive function while other ants are responsible for non-reproductive roles such as defense, caring for the brood, and foraging for food. Research indicates that the system of division of labor naturally arises in conjunction with the formation of the group, rather than as a secondary adaptation; this was demonstrated by an experiment in which otherwise solitary queen harvest ants were placed in forced association. The results of the study indicated that divisions of labor arose in groups that lack an evolutionary history of such social arrangements.^[13]

Non-reproductive caste

Within non-reproductive Pogonomyrmex barbatus worker ants, five major tasks are performed: foraging, maintenance of the nest, defense, midden work, and convening. Roles are not constant and chemical interactions determine when certain ants engage in certain activities. As such, these tasks are relatively fluid and cannot be understood as separate processes. The transition in behavior on behalf of one group triggers behavioral transitions in other groups of worker ants.^[14]

Reproductive caste

The reproductive Pogonomyrmex barbatus caste are responsible for the formation of new colonies. A single queen ant establishes every colony. Large numbers of winged male ants and virgin queen ants fly to mating aggregation sites following mid-summer monsoon rains. In order to find a successful colony, Pogonomyrmex barbatus queens must mate with males from two separate lineages. One lineage results in ants that will become the workers of the colony. These are the ants responsible for the non-reproductive tasks of the colony, including: foraging for food, building and defending the nest, and brood care. The other lineage produces reproductive female ants. After mating with the male ants at the aggregation site, the queen flies away to establish a new colony. Upon arriving at her new nest site, the queen loses her wings and builds a nest in the soil. The entrance into the nest is then sealed off in order to lay her eggs in safety. With this, the colony is born. Over the course of the following six to eight weeks, the primary brood of non-reproductive worker ants emerges and begins to forage and build the colony.^[15]

Reproduction

Mating behavior

Mating is perennial and species-specific between sub-species of the Red Harvester Ant. Males distinguish reproductive females of their species from females of other species using pheromones. This occurs as a result of sexually stimulating pheromones secreted from the poison-glands of reproductive Pogonomyrmex barbatus females. These pheromones are perfectly detected by males of the species upon physical contact, resulting in the stimulation of sexual behavior.

Mating occurs at reproductive aggregation sites. Secretions from the mandibular glands of males initially mark these sites. The secretions attract females, as well as additional males, resulting in strong male competition for mates. The system of mating within the Pogonomyrmex barbatus species is comparable to lek behavior performed by many vertebrate species. The male ants congregate and collectively give off a pheromone that attracts reproductive females. The more males present to give off the pheromone, the stronger the attraction for the females. Although this practice strongly favors certain males and leaves many others without mates, the congregation of males attracts more females on the whole as opposed to pheromone release on behalf of a solitary male. Consequently, it is more desirable for the less attractive males to remain in the lek than to attempt to attract females on their own.^[16]

Sexual selection

Within reproductive aggregations of Pogonomyrmex barbatus ants, strong male competition exists. Male harvester ants engage in communal mating displays in order to attract females. Male ants will attempt to mate with any female they encounter, but females resist copulation from the males. Consequently, the communal mating displays heavily favor reproduction with larger or more persistent males who are able to overpower the females and successfully copulate. The male ants will copulate for as long as possible, likely to restrict access to the female from other males to ensure their sperm survives to reproduce.^[17]

Predation

Red harvester ants are a favorite food for desert horned lizards. Harvester ants will defend their colonies vigorously against real or perceived attacks, whether by large or small animals. They may bite ferociously and their stings are venomous and painful. The effect spreads through the lymphatic system, sometimes causing dangerous reactions, especially in animals sensitive or allergic to their venom.

Over the years, their numbers have been declining, and this has often been attributed to competition for food with the invasive red imported fire ant and the Argentine ant. Their decline has affected many native species, especially those for which the red harvester ant is a chief source of food, such as the Texas horned lizard.

Red harvester ant nest entry

Use in captive ant ecologies

Red harvester ants are commonly used in captive ant ecologies (the so-called, "Ant Farm", which is a trademark of Uncle Milton, Inc.). Their large size and foraging habits, coupled with an inability to climb the glass walls of the enclosures used, make the species an excellent choice for this role.

See also

• Behavioral ecology
• Evolution
• Eusociality
• Ant colony optimization
• Task allocation and partitioning of social insects
• Sexual selection

References

External links

• Media related to Pogonomyrmex barbatus at Wikimedia Commons
• EconTalk interview with Deborah Gordon and her research on Red harvester ants