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Domestication reduces caterpillar response to auditory predator cues.

Zachary A Lee1, Alex K Baranowski1, Caroline B Cohen1

  • 1Department of Biological Sciences, The University of Rhode Island, Kingston, RI 02881, USA.

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Domestication reduced sensitivity to predator cues in gypsy moths (Lymantria dispar dispar). Captive-reared insects may not accurately reflect wild populations in behavioral studies.

Keywords:
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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Entomology

Background:

  • Domestication alters organismal traits, including behavior and stress responses.
  • Predation is a key selective pressure in wild populations, but its absence in captivity can lead to reduced sensitivity to threats.
  • Previous research has shown this in various taxa, but insect responses to domestication-related predation risk loss were unstudied.

Purpose of the Study:

  • To investigate the impact of domestication on predation risk sensitivity in gypsy moths (Lymantria dispar dispar).
  • To compare the behavioral responses of wild and domesticated gypsy moth larvae to predator and non-predator acoustic cues.

Main Methods:

  • Wild and domesticated (over 50 generations) Lymantria dispar dispar larvae were exposed to predator (wasp buzzing), non-predator (mosquito buzzing), or control (no sound) auditory stimuli.
  • Larval survival rates were compared between the two stocks under different acoustic conditions.

Main Results:

  • Wasp buzzing significantly reduced survival in wild gypsy moth larvae compared to the control group.
  • Domesticated gypsy moth larvae did not exhibit a significant change in survival when exposed to wasp buzzing.
  • Mosquito buzzing did not affect the survival of either wild or domesticated larvae.

Conclusions:

  • Domesticated Lymantria dispar dispar larvae show reduced sensitivity to auditory cues of predation risk.
  • Captive-reared insects may not serve as reliable analogs for wild populations in studies of risk-related behaviors.
  • This finding has implications for using domesticated insects in ecological and behavioral research.