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Related Experiment Video

Updated: Feb 16, 2026

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Chemical Signal-to-Noise Detection by Spiny Lobsters.

R K Zimmer-Faust

    The Biological Bulletin
    |January 7, 2018
    PubMed
    Summary

    Spiny lobsters can detect minute changes in glycine concentration, with a just noticeable difference (jnd) threshold of 2-8%. This highlights their sensitive olfactory system for marine environments.

    Area of Science:

    • Marine biology
    • Sensory ecology
    • Chemoreception

    Background:

    • The just noticeable difference (jnd) threshold measures the smallest detectable concentration change.
    • Previous jnd research focused on terrestrial animals, neglecting marine organisms in chemically complex environments.
    • Marine life constantly navigates a 'noisy' chemical seascape where stimuli are often background components.

    Purpose of the Study:

    • To measure the jnd threshold for chemical detection in marine invertebrates.
    • To investigate the olfactory capabilities of spiny lobsters (Panulirus interruptus) in detecting glycine.
    • To assess the ecological relevance of sensitive chemoreception in marine organisms.

    Main Methods:

    • Laboratory assays were conducted to quantify glycine detection by spiny lobsters.

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  • Glycine was used as a stimulus due to its prevalence in seawater and prey.
  • High-performance liquid chromatography (HPLC) was employed for precise chemical measurements of glycine concentrations.

    • Main Results:

    • The estimated jnd threshold for glycine detection in spiny lobsters was 2-8% above background concentration.
    • This threshold is lower than those reported for olfactory detection in humans and terrestrial animals.
    • Lobsters demonstrated a significant ability to discern subtle increases in glycine levels.

    Conclusions:

    • Spiny lobsters possess a highly sensitive olfactory system for detecting chemical gradients.
    • This enhanced chemosensory ability is crucial for their foraging and survival in marine ecosystems.
    • The study provides novel insights into marine sensory perception and ecological adaptations.