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Updated: Jan 8, 2026

Quantifying Branching Density in Rat Mammary Gland Whole-mounts Using the Sholl Analysis Method
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Rensch's Rule Is Not Supported by a Mammals-Wide Analysis.

Kaia J Tombak, Severine B S W Hex

    The American Naturalist
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    PubMed
    Summary
    This summary is machine-generated.

    Rensch's rule, concerning sexual size dimorphism, was tested in mammals. The study found very limited support for this rule, suggesting it is not a general phenomenon in mammals.

    Keywords:
    body massmammalssexual dimorphismsexual selection

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    Area of Science:

    • Evolutionary biology
    • Zoology
    • Sexual selection

    Background:

    • Rensch's rule proposes a relationship between sexual size dimorphism and body size.
    • The rule has been influential but lacks consistent empirical support.
    • Previous evidence for Rensch's rule in mammals has been equivocal.

    Purpose of the Study:

    • To rigorously test Rensch's rule using a comprehensive dataset of mammalian sexual size dimorphism.
    • To investigate whether the rule holds true across different mammalian families and biases in dimorphism.

    Main Methods:

    • Utilized a recently published dataset on sexual size dimorphism in mammals.
    • Employed linear regressions with phylogenetic controls to analyze the data.
    • Conducted analyses across all mammals and within specific mammalian families.

    Main Results:

    • Neither male-biased nor female-biased dimorphic mammal species consistently conform to Rensch's rule.
    • When analyzed within families, Rensch's rule only applied to 3 out of 21 tested mammalian groups.
    • Overall, the study found very limited support for Rensch's rule in mammals.

    Conclusions:

    • Rensch's rule is unlikely to be a general phenomenon in mammals.
    • The findings challenge the broad applicability of Rensch's rule in evolutionary biology.
    • Further research may be needed to understand the drivers of sexual size dimorphism in mammals.