Monteverde Institute: Tropical Ecology and Conservation

Alternative Title

¿Está organizado el tráfico en los caminos de las hormigas zompopas Atta cephalotes?

Creator

Angela C. Rao

Files

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Publication Date

November 2001

Abstract

The leaf cutting tribe Attini (Formicidae: Myrmicinae) shows numerous adaptations that increase foraging efficiency. Such adaptations are seen in their highly polymorphic caste systems, trails branching from many different exit holes, clearing and maintenance of foraging trails, and pheromonal signaling and recruitment. It is reasonable to assume that mechanisms exist that would reduce incidence of collisions, traffic jams, etc., on foraging trails. This hypothesis was tested by recording trail density and time, linear distance, and direction of ant travel on the trails of Atta Cephalotes and looking for certain trends. Ants traveling towards the nest were not found to vary much from those traveling away from the nest. Because of this and the lack of distance and speed dependence on ant density or direction, it was concluded that some form of organization may exist on foraging trails. The most likely explanation for this is the presence of some organization method such as pheromone trails with a maximum trail width and yielding of ants traveling towards the foraging source to ants carrying leaves.

Resumen

La tribu de las zompopas Attini (Formicidae: Myrmicinae) muestran muchas adaptaciones para aumentar la eficiencia de forrajeo. Esas adaptaciones se pueden ver en su alto polimorfismo de castas, el uso de senderos en aberturas diferentes de los nidos, el mantenimiento y limpieza de senderos y el uso de feromonas para marcar senderos. Es razonable asumir que existen mecanismos que podrían reducir la incidencia de colisiones en los senderos. Esta hipótesis se probó al tomar datos de densidad, tiempo, distancia linear y la dirección a la que la hormiga viaja en el sendero. Las hormigas que viajaron hacia el nido no mostraron diferencias con las que lo hicieron lejos del sendero. Porque no se encontraron una dependencia en la distancia y la velocidad con la densidad o la dirección, se concluyó que algún tipo de organización debe existir en los senderos. La explicación más aceptable es que la organización se da por el uso de feromonas con un ancho máximo de sendero donde las hormigas viajan acarreando las hojas.

Keywords

Ants--Behavior, Atta (Insects), CIEE Fall 2001

Palabras claves

Hormigas--Comportamiento, Atta (Insectos), CIEE Otoño 2001

Extent

11 pages

Geographic Location

Cañitas (Guanacaste, Costa Rica); Monteverde (Puntarenas, Costa Rica)

Holding Location

Monteverde Institute

Language

English; Spanish

Media Type

Articles

Format

Digital Only

Identifier

M39-00087

Type

Book

Is traffic organized on trails of the leaf cutting ant Atta cephalotes?, November 2001

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