Walking like an ant: A quantitative and experimental approach to understanding locomotor mimicry in the jumping spider Myrmarachne formicaria

Paul S. Shamble*, Ron R. Hoy, Itai Cohen, Tsevi Beatus

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Protective mimicry, in which a palatable species avoids predation by being mistaken for an unpalatable model, is a remarkable example of adaptive evolution. These complex interactions between mimics, models and predators can explain similarities between organisms beyond the often-mechanistic constraints typically invoked in studies of convergent evolution. However, quantitative studies of protective mimicry typically focus on static traits (e.g. colour and shape) rather than on dynamic traits like locomotion. Here, we use high-speed cameras and behavioural experiments to investigate the role of locomotor behaviour in mimicry by the ant-mimicking jumping spider Myrmarachne formicaria, comparing its movement to that of ants and non-mimicking spiders. Contrary to previous suggestions, we find mimics walk using all eight legs, raising their forelegs like ant antennae only when stationary. Mimics exhibited winding trajectories (typical wavelength = 5–10 body lengths), which resemble the winding patterns of ants specifically engaged in pheromone-trail following, although mimics walked on chemically inert surfaces. Mimics also make characteristically short (approx. 100 ms) pauses. Our analysis suggests that this makes mimics appear ant-like to observers with slow visual systems. Finally, behavioural experiments with predatory spiders yield results consistent with the protective mimicry hypothesis. These findings highlight the importance of dynamic behaviours and observer perception in mimicry.

Original languageAmerican English
Article number20170308
JournalProceedings of the Royal Society B: Biological Sciences
Volume284
Issue number1858
DOIs
StatePublished - 12 Jul 2017

Bibliographical note

Publisher Copyright:
© 2017 The Authors.

Keywords

  • Ant
  • Ant mimicry
  • Batesian mimicry
  • Locomotion
  • Spider

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