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Australian Journal of Zoology Australian Journal of Zoology Society
Evolutionary, molecular and comparative zoology
RESEARCH ARTICLE

Multiple orientation cues in an Australian trunk-trail-forming ant, Iridomyrmex purpureus

Ashley Card A , Caitlin McDermott A and Ajay Narendra A B C
+ Author Affiliations
- Author Affiliations

A Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia.

B Department of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia.

C Corresponding author. Email: ajay.narendra@mq.edu.au

Australian Journal of Zoology 64(3) 227-232 https://doi.org/10.1071/ZO16046
Submitted: 1 June 2016  Accepted: 29 August 2016   Published: 22 September 2016

Abstract

Ants use multiple cues for navigating to a food source or nest location. Directional information is derived from pheromone trails or visual landmarks or celestial objects. Some ants use the celestial compass information along with an ‘odometer’ to determine the shortest distance home, a strategy known as path integration. Some trail-following ants utilise visual landmark information whereas few of the solitary-foraging ants rely on both path integration and visual landmark information. However, it is unknown to what degree trail-following ants use path integration and we investigated this in a trunk-trail-following ant, Iridomyrmex purpureus. Trunk-trail ants connect their nests to food sites with pheromone trails that contain long-lasting orientation information. We determined the use of visual landmarks and the ability to path integrate in a trunk-trail forming ant. We found that experienced animals switch to relying on visual landmark information, and naïve individuals rely on odour trails. Ants displaced to unfamiliar locations relied on path integration, but, surprisingly, they did not travel the entire homebound distance. We found that as the homebound distance increased, the distance ants travelled relying on the path integrator reduced.

Additional keywords: celestial compass, experience, landmarks, naïve, navigation, path integration, pheromone.


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