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Behavior of Ants Escaping from a Single-Exit Room.

Wang S, Lv W, Song W - PLoS ONE (2015)

Bottom Line: The ants formed several groups as they moved toward the exit to escape.We measured the time intervals between individual escapes in six versions of the experiment, each containing an exit of a different width, to quantify the movement of the groups.We also investigated the relationship between the number of ants in a group and the group flow rate.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, China.

ABSTRACT
To study the rules of ant behavior and group-formation phenomena, we examined the behaviors of Camponotus japonicus, a species of large ant, in a range of situations. For these experiments, ants were placed inside a rectangular chamber with a single exit that also contained a filter paper soaked in citronella oil, a powerful repellent. The ants formed several groups as they moved toward the exit to escape. We measured the time intervals between individual escapes in six versions of the experiment, each containing an exit of a different width, to quantify the movement of the groups. As the ants exited the chamber, the time intervals between individual escapes changed and the frequency distribution of the time intervals exhibited exponential decay. We also investigated the relationship between the number of ants in a group and the group flow rate.

No MeSH data available.


Related in: MedlinePlus

Escape distribution of ants under the effect of a repellent.(A), (B) The temporal evolution of the number of ants escaping through an exit size of 1w = 0.5 cm and other exit sizes (2w = 1.0 cm, 3w = 1.5 cm, 4w = 2.0 cm, 5w = 2.5 cm, and 6w = 3.0 cm); the data of one experimental repetition is shown. The solid line represents the result of nonlinear fitting. The flow of ants is divided into several groups. Solid line: ; where y represents the number of escaped ants, and x represents time.
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pone.0131784.g002: Escape distribution of ants under the effect of a repellent.(A), (B) The temporal evolution of the number of ants escaping through an exit size of 1w = 0.5 cm and other exit sizes (2w = 1.0 cm, 3w = 1.5 cm, 4w = 2.0 cm, 5w = 2.5 cm, and 6w = 3.0 cm); the data of one experimental repetition is shown. The solid line represents the result of nonlinear fitting. The flow of ants is divided into several groups. Solid line: ; where y represents the number of escaped ants, and x represents time.

Mentions: On the basis of the size measurements of 50 randomly selected ants, the average head width was 0.3 ± 0.08 cm (mean ± standard deviation) and body length 1.1 ± 0.16 cm. After taking into consideration the space that the ants’ limbs and antennae would occupy, the exit width of 1w was set at 0.5 cm to ensure that the opening allowed only one ant to escape at a time. The temporal evolution of the number of ants passing through the exit was extracted from video records. Fig 2 depicts the results of experiments using various exit widths. Based on nonlinear fitting, the curve shapes of the temporal evolution of the number of ants that escaped through each exit width all showed exponential decay. In addition, the data showed that the ant flow through the exit divided into several groups, indicating that a long time interval existed among the ant groups during the escape period. This result was superficially similar to the group formations of exiting pedestrians [14], but the reasons leading to such group formations were quite different.


Behavior of Ants Escaping from a Single-Exit Room.

Wang S, Lv W, Song W - PLoS ONE (2015)

Escape distribution of ants under the effect of a repellent.(A), (B) The temporal evolution of the number of ants escaping through an exit size of 1w = 0.5 cm and other exit sizes (2w = 1.0 cm, 3w = 1.5 cm, 4w = 2.0 cm, 5w = 2.5 cm, and 6w = 3.0 cm); the data of one experimental repetition is shown. The solid line represents the result of nonlinear fitting. The flow of ants is divided into several groups. Solid line: ; where y represents the number of escaped ants, and x represents time.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4488427&req=5

pone.0131784.g002: Escape distribution of ants under the effect of a repellent.(A), (B) The temporal evolution of the number of ants escaping through an exit size of 1w = 0.5 cm and other exit sizes (2w = 1.0 cm, 3w = 1.5 cm, 4w = 2.0 cm, 5w = 2.5 cm, and 6w = 3.0 cm); the data of one experimental repetition is shown. The solid line represents the result of nonlinear fitting. The flow of ants is divided into several groups. Solid line: ; where y represents the number of escaped ants, and x represents time.
Mentions: On the basis of the size measurements of 50 randomly selected ants, the average head width was 0.3 ± 0.08 cm (mean ± standard deviation) and body length 1.1 ± 0.16 cm. After taking into consideration the space that the ants’ limbs and antennae would occupy, the exit width of 1w was set at 0.5 cm to ensure that the opening allowed only one ant to escape at a time. The temporal evolution of the number of ants passing through the exit was extracted from video records. Fig 2 depicts the results of experiments using various exit widths. Based on nonlinear fitting, the curve shapes of the temporal evolution of the number of ants that escaped through each exit width all showed exponential decay. In addition, the data showed that the ant flow through the exit divided into several groups, indicating that a long time interval existed among the ant groups during the escape period. This result was superficially similar to the group formations of exiting pedestrians [14], but the reasons leading to such group formations were quite different.

Bottom Line: The ants formed several groups as they moved toward the exit to escape.We measured the time intervals between individual escapes in six versions of the experiment, each containing an exit of a different width, to quantify the movement of the groups.We also investigated the relationship between the number of ants in a group and the group flow rate.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, China.

ABSTRACT
To study the rules of ant behavior and group-formation phenomena, we examined the behaviors of Camponotus japonicus, a species of large ant, in a range of situations. For these experiments, ants were placed inside a rectangular chamber with a single exit that also contained a filter paper soaked in citronella oil, a powerful repellent. The ants formed several groups as they moved toward the exit to escape. We measured the time intervals between individual escapes in six versions of the experiment, each containing an exit of a different width, to quantify the movement of the groups. As the ants exited the chamber, the time intervals between individual escapes changed and the frequency distribution of the time intervals exhibited exponential decay. We also investigated the relationship between the number of ants in a group and the group flow rate.

No MeSH data available.


Related in: MedlinePlus