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Related Experiment Videos

Lemming cycles in captivity.

A Semb-Johansson, R Wiger, C E Engh

    Experientia
    |November 15, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Confined Norwegian lemming populations exhibited natural population cycles, unlike other rodents which stabilize. Declines were linked to increased juvenile mortality and lower pregnancy rates in lemmings.

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    Area of Science:

    • Ecology
    • Population Dynamics
    • Animal Behavior

    Background:

    • Rodent population studies often show stabilization in confined settings.
    • Understanding population cycles is crucial for ecological management.
    • Norwegian lemmings (Lemmus lemmus) are key species for studying population dynamics.

    Purpose of the Study:

    • To investigate population dynamics of Norwegian lemmings in controlled environments.
    • To compare confined lemming population fluctuations with natural populations.
    • To identify factors contributing to population declines in confined rodent models.

    Main Methods:

    • Two freely growing confined populations of Norwegian lemmings were established.
    • Population numbers were monitored over time to track peaks and declines.

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  • Factors such as juvenile mortality and pregnancy rates were assessed.

    • Main Results:

    • The confined lemming populations demonstrated cyclical peaks and declines.
    • These patterns mirrored those observed in natural Norwegian lemming populations.
    • In contrast, most other confined rodent populations studied previously stabilized.

    Conclusions:

    • Freely growing confined populations can successfully replicate natural population cycles.
    • Juvenile mortality and reduced pregnancy rates are significant drivers of population decline in Norwegian lemmings.
    • This study provides a valuable model for understanding rodent population dynamics.