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Visual determinants of prey chasing behavior in a mudflat crab.

Brian Gancedo1,2, Carla Salido1,2, Daniel Tomsic3,2

  • 1Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Fisiología, Biología Molecular y Celular, Pabellón 2, Ciudad Universitaria, CP1428, Buenos Aires, Argentina.

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Summary

Mud crabs exhibit predatory responses (PR) to visual stimuli, influenced by dummy size and distance. Successful prey capture depends on dummy velocity, offering insights into crab behavior.

Keywords:
CaptureCrustaceanEscape behaviorPredatory behaviorPursuit

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Area of Science:

  • Marine biology
  • Animal behavior
  • Crustacean research

Background:

  • The crab *Neohelice granulata* lives in mudflats, acting as both prey and predator.
  • While escape responses are well-studied, the predatory response (PR) in this species remains unexplored.

Purpose of the Study:

  • To reliably elicit and investigate the predatory response (PR) of *Neohelice granulata* in a laboratory setting.
  • To identify key stimulation conditions influencing PR occurrence and successful prey capture.

Main Methods:

  • Using dummies of varying sizes and velocities in a laboratory arena over multiple trials.
  • Employing generalized linear mixed-model (GLMM) analysis to determine significant factors.

Main Results:

  • PR probability was highest with medium-sized dummies and declined after initial trials.
  • Dummy size and tracking distance significantly influenced PR elicitation; velocity primarily affected capture success.
  • Large dummies primarily triggered avoidance behaviors, not predatory responses.

Conclusions:

  • Crabs demonstrate the ability to assess dummy distance and absolute size.
  • This study characterizes the predatory response, enabling comparative analysis with known escape behaviors in *Neohelice granulata*.