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Scotopic sensitivity in coyotes (Canis latrans).

S W Horn, P N Lehner

    Journal of Comparative and Physiological Psychology
    |November 1, 1975
    PubMed
    Summary

    Coyote vision was studied using psychophysical methods to determine their low-light visual capabilities. Results show coyotes possess excellent night vision, crucial for their nocturnal hunting behavior.

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    Area of Science:

    • Animal Behavior
    • Sensory Physiology
    • Comparative Vision

    Background:

    • Understanding the visual capabilities of nocturnal predators like coyotes is essential for ecological studies.
    • Previous research has established methods for measuring visual thresholds in animals, providing a foundation for this study.

    Purpose of the Study:

    • To determine the absolute scotopic limen (low-light visual threshold) in coyotes.
    • To characterize the scotopic spectral sensitivity and adaptation curves in coyote vision.
    • To relate these visual parameters to the ecological niche and nocturnal activity of coyotes.

    Main Methods:

    • Operant conditioning was used to train three coyotes to respond to light stimuli.
    • Scotopic adaptation curves and spectral sensitivity curves were generated.
    • Retinal histology and electroretinography were employed to analyze retinal structure and function.

    Main Results:

    • The mean scotopic thresholds for the coyotes were not significantly different.
    • Adaptation curves revealed a distinct rod-cone break, indicating functional differences in rod and cone photoreceptors.
    • Electroretinography confirmed a rod-cone break at approximately 15 minutes, consistent with a duplex retina rich in rods.

    Conclusions:

    • Coyotes possess a scotopic visual threshold that is readily exceeded by natural nocturnal illumination.
    • Their visual system is well-adapted for low-light conditions, supporting their role as nocturnal hunters.
    • The findings provide valuable insights into the sensory ecology of coyotes.

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