4.6 Article

Fire ants perpetually rebuild sinking towers

期刊

ROYAL SOCIETY OPEN SCIENCE
卷 4, 期 7, 页码 -

出版社

ROYAL SOC
DOI: 10.1098/rsos.170475

关键词

emergent; swarm; bivouac; self-assembly

资金

  1. US Army Research Laboratory
  2. US Army Research Office Mechanical Sciences Division, Complex Dynamics and Systems Program [W911NF-12-R-0011]
  3. David McKenney Family Professorship at Georgia Tech.
  4. Direct For Mathematical & Physical Scien
  5. Division Of Physics [1205878] Funding Source: National Science Foundation

向作者/读者索取更多资源

In the aftermath of a flood, fire ants, Solenopsis invicta, cluster into temporary encampments. The encampments can contain hundreds of thousands of ants and reach over 30 ants high. How do ants build such tall structures without being crushed? In this combined experimental and theoretical study, we investigate the shape and rate of construction of ant towers around a central support. The towers are bell shaped, consistent with towers of constant strength such as the Eiffel tower, where each element bears an equal load. However, unlike the Eiffel tower, the ant tower is built through a process of trial and error, whereby failed portions avalanche until the final shape emerges. High-speed and novel X-ray videography reveal that the tower constantly sinks and is rebuilt, reminiscent of large multicellular systems such as human skin. We combine the behavioural rules that produce rafts on water with measurements of adhesion and attachment strength to model the rate of growth of the tower. The model correctly predicts that the growth rate decreases as the support diameter increases. This work may inspire the design of synthetic swarms capable of building in vertical layers.

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