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Related Experiment Videos

Learning improves growth rate in grasshoppers.

R Dukas1, E A Bernays

  • 1School of Biological Sciences, University of Nebraska, Lincoln, NE 68588-0118, USA. rdukas@sfu.ca

Proceedings of the National Academy of Sciences of the United States of America
|March 8, 2000
PubMed
Summary

Insect learning significantly boosts growth rates. Grasshoppers using associative learning in a predictable environment showed better development than those in a random environment, highlighting learning’s adaptive value.

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Area of Science:

  • Behavioral Ecology
  • Insect Physiology
  • Animal Cognition

Background:

  • Insect learning is crucial for survival and reproduction.
  • Understanding the adaptive significance of learning in insects requires empirical evidence.
  • Dietary choices impact insect growth and fitness.

Purpose of the Study:

  • To quantify the adaptive significance of insect learning.
  • To compare growth rates of grasshoppers under predictable versus unpredictable feeding conditions.
  • To demonstrate the role of associative learning in insect diet selection.

Main Methods:

  • Grasshoppers (Schistocerca americana) were divided into Learning and Random treatments.
  • The Learning group experienced a stable environment with constant food source characteristics.

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  • The Random group experienced a fluctuating environment with alternating food source characteristics.

    • Main Results:

    • Grasshoppers in the Learning treatment exhibited significantly higher growth rates.
    • Associative learning for diet choice led to improved growth.
    • The study demonstrated the adaptive value of learning in a short-lived insect.

    Conclusions:

    • Insect associative learning provides a significant adaptive advantage.
    • Learning enhances growth by enabling optimal diet selection.
    • This study underscores the ecological importance of cognitive abilities in insects.