How ants use vision when homing backward

Mangan, Michael and Schwarz, Sebastian and Webb, Barbara and Wystach, Antoine and Zeil, Jochen (2017) How ants use vision when homing backward. Current Biology, 27 (3). pp. 401-407. ISSN 0960-9822

Full content URL: http://dx.doi.org/10.1016/j.cub.2016.12.019

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Abstract

Ants can navigate over long distances between their nest and food sites using visual cues [1 and 2]. Recent studies show that this capacity is undiminished when walking backward while dragging a heavy food item [3, 4 and 5]. This challenges the idea that ants use egocentric visual memories of the scene for guidance [1, 2 and 6]. Can ants use their visual memories of the terrestrial cues when going backward? Our results suggest that ants do not adjust their direction of travel based on the perceived scene while going backward. Instead, they maintain a straight direction using their celestial compass. This direction can be dictated by their path integrator [5] but can also be set using terrestrial visual cues after a forward peek. If the food item is too heavy to enable body rotations, ants moving backward drop their food on occasion, rotate and walk a few steps forward, return to the food, and drag it backward in a now-corrected direction defined by terrestrial cues. Furthermore, we show that ants can maintain their direction of travel independently of their body orientation. It thus appears that egocentric retinal alignment is required for visual scene recognition, but ants can translate this acquired directional information into a holonomic frame of reference, which enables them to decouple their travel direction from their body orientation and hence navigate backward. This reveals substantial flexibility and communication between different types of navigational information: from terrestrial to celestial cues and from egocentric to holonomic directional memories.

Keywords:insects; ants; navigation; egocentric memories; directional frame of reference; holonomic; backward motion; landmarks; celestial compass
Subjects:C Biological Sciences > C180 Ecology
C Biological Sciences > C120 Behavioural Biology
G Mathematical and Computer Sciences > G920 Others in Computing Sciences
Divisions:College of Science > School of Computer Science
ID Code:25891
Deposited On:25 Jan 2017 10:16

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