Effect of trail pheromones and weather on the moving behaviour of the army ant Eciton burchellii Research Article (C.W. Rettenmeyer memorial papers) First Online: 24 December 2010 Received: 14 May 2010 Revised: 22 October 2010 Accepted: 06 December 2010 DOI:
Cite this article as: Califano, D. & Chaves-Campos, J. Insect. Soc. (2011) 58: 309. doi:10.1007/s00040-010-0140-z Abstract
Most of what we know about the moving behaviour of the nomadic army ant
Eciton burchellii comes from Barro Colorado Island (BCI) in Panama. Nomadic colonies raid roughly in straight line during the day and relocate their nests along this path in the evening. At BCI, nomadic colonies raid roughly in the same compass bearing of the previous day, presumably using their pheromone-marked raiding trails as cues to pick directions. Deviations from this direction occur when a nomadic colony fails to move, possibly due to environmental conditions. The generality of these results has been questioned. We studied nomadic colonies of E. burchellii at La Selva Biological Station, Costa Rica to evaluate the generality of the results obtained from BCI. We measured the angle between consecutive raids, manipulated the distribution of previous day’s raid pheromones around nests to evaluate the effect of raid pheromone on foraging direction, and evaluated the effect of rainfall on the probability of moving and on deviation from the previous day’s raid. Colonies did not follow the same compass bearing of the previous day and formed new raids on areas with previous day’s raid pheromones or without them. Rainfall can explain when nomadic colonies move, but did not explain deviation from the previous day’s raid direction. Our results suggest that caution should be taken when generalizing the insightful results obtained from the BCI population. Keywords Army ants Costa Rica La Selva Biological Station Migration Pheromones Rainfall Electronic supplementary material
The online version of this article (doi:
) contains supplementary material, which is available to authorized users. 10.1007/s00040-010-0140-z References
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