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Flexible information sampling in vibrational assessment of predation risk by red-eyed treefrog embryos.

Karen M Warkentin1, Michael S Caldwell, Timothy D Siok

  • 1Department of Biology, Boston University, Boston, MA 02215, USA. kwarken@bu.edu

The Journal of Experimental Biology
|February 3, 2007
PubMed
Summary

Red-eyed treefrog embryos balance information gathering with risk, adjusting hatching decisions based on vibration cues. They sample less information from longer vibration cycles to minimize predation risk.

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Area of Science:

  • Behavioral Ecology
  • Developmental Biology
  • Sensory Ecology

Background:

  • Prey animals face risks from missed predator cues or false alarms.
  • Information gathering to assess risk involves trade-offs between benefits and costs.
  • Red-eyed treefrog embryos utilize vibrational cues from snake attacks to trigger premature hatching.

Purpose of the Study:

  • To investigate how red-eyed treefrog embryos adjust their sampling of vibrational information based on its accrued cost and benefit.
  • To determine if embryos balance the value of information against the risks of prolonged exposure to predator cues.

Main Methods:

  • Vibration playback experiments were conducted to simulate snake attacks and benign vibrations.
  • Latency to initiate hatching was measured in response to different vibration patterns.

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  • Embryo hatching decisions were analyzed in relation to vibration duration, spacing, and frequency.

    • Main Results:

    • Embryos exhibited delayed hatching, not immediate responses, to both natural attacks and playback stimuli.
    • Hatching delay varied with the rate of information accrual from vibrations.
    • Embryos sampled fewer vibration cycles from longer-cycle stimuli, indicating reduced information gathering when risk increases.

    Conclusions:

    • Red-eyed treefrog embryos demonstrate flexible information sampling strategies.
    • Embryos balance the trade-off between acquiring sufficient information and minimizing exposure to predation risk.
    • This adaptive behavior enhances survival by optimizing hatching decisions in response to predator threats.