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Related Experiment Videos

Distance estimation by foraging honeybees

Esch, Burns

    The Journal of Experimental Biology
    |January 1, 1996
    PubMed
    Summary
    This summary is machine-generated.

    Honeybees may not use energy expenditure to gauge foraging distances. Instead, new research suggests bees likely use optical flow, or the speed of visual motion, to estimate how far they have flown.

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    Area of Science:

    • Animal Behavior
    • Sensory Ecology
    • Insect Navigation

    Background:

    • The 'energy hypothesis' posits that honeybees gauge foraging distances based on energy expended during flights.
    • Previous experimental evidence supporting the energy hypothesis has shown inconsistencies.
    • New findings challenge the validity of the energy hypothesis in explaining bee navigation.

    Purpose of the Study:

    • To critically evaluate the prevailing 'energy hypothesis' for honeybee distance assessment.
    • To propose and provide evidence for an alternative mechanism: the 'optical flow hypothesis'.
    • To explain how bees accurately estimate flight distances.

    Main Methods:

    • Review of existing experimental data on honeybee foraging behavior.
    • Analysis of waggle dance signals from bees under varying flight conditions (e.g., added weight, varying altitudes).

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  • Comparison of bee-signaled distances with actual flight distances in controlled experiments.

    • Main Results:

    • Bees carrying extra weight did not overestimate flight distance.
    • Bees flying to elevated feeders signaled distances inconsistent with energy expenditure.
    • Bees showed significant underestimation of distance when flight altitude increased dramatically.
    • Bees flying between elevated locations signaled shorter distances than actual.

    Conclusions:

    • The energy hypothesis is inconsistent with empirical observations of honeybee foraging.
    • The 'optical flow hypothesis,' where bees use retinal image motion speed, provides a more accurate explanation for distance estimation.
    • Flight altitude influences perceived optical flow, aiding in distance assessment, particularly closer to the ground.