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Techniques for Investigating the Anatomy of the Ant Visual System

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Published on: November 27, 2017

The twilight zone: ambient light levels trigger activity in primitive ants.

Ajay Narendra¹, Samuel F Reid, Jan M Hemmi

¹ARC Centre of Excellence in Vision Science and Centre for Visual Sciences, Research School of Biology, The Australian National University, Canberra, Australia. ajay.narendra@anu.edu.au

Proceedings. Biological Sciences

|February 5, 2010

Summary

Australian bull ants initiate foraging during twilight, not by internal clock, but by sensing specific light intensity. This light cue optimizes their trade-off between avoiding predators and navigating effectively.

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Visual Classical Conditioning in Wood Ants

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Visual Classical Conditioning in Wood Ants

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Published on: October 5, 2018

Area of Science:

Animal behavior
Sensory ecology
Chronobiology

Background:

Many animals exhibit crepuscular activity, becoming active during twilight.
The environmental cues triggering this temporal niche remain largely unknown.
Animals may use environmental variables or anticipate regular events to time activity.

Purpose of the Study:

To investigate the cues that trigger foraging activity in the Australian bull ant (Myrmecia pyriformis).
To determine if ants rely on internal rhythms or environmental signals for activity onset.
To understand the adaptive significance of twilight foraging in this species.

Main Methods:

Observational studies of foraging activity throughout the year.
Correlation analysis of foraging onset with temperature, time relative to sunset, and ambient light intensity.
Experimental manipulation of ambient light intensity to test ant responses.

Main Results:

Myrmecia pyriformis exclusively forages during evening twilight.
Foraging onset is triggered by a specific ambient light intensity, not temperature or a fixed time post-sunset.
Experimental increases in light intensity delayed foraging onset, while decreases advanced it, confirming light measurement.

Conclusions:

Australian bull ants precisely measure ambient light intensity to initiate foraging.
Activity is not governed by an internal circadian rhythm but by an external light cue.
Twilight foraging and light-based cueing likely optimize the balance between predation risk and navigational efficiency.