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Major Differences in Minor Allometries: A Reply to Moczek.

Joseph L Tomkins, Janne S Kotiaho, Natasha R LeBas

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    Accurate horn length measurement in Onthophagus taurus beetles is crucial for understanding scaling patterns. Corrected measurements reveal positive allometry in horn growth, challenging previous models.

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    Area of Science:

    • Evolutionary biology
    • Developmental biology
    • Insect morphology

    Background:

    • Scaling patterns in animal morphology, particularly horn allometry in beetles, are key indicators of developmental processes.
    • Discrepancies in laboratory findings regarding horn growth allometry in Onthophagus taurus suggest measurement inconsistencies.

    Purpose of the Study:

    • To resolve conflicting reports on horn length scaling in Onthophagus taurus by evaluating different measurement techniques.
    • To determine the accurate allometric pattern of horn growth in relation to body size in this beetle species.

    Main Methods:

    • Comparative analysis of alternative linear and volumetric measurements of beetle horns.
    • Statistical evaluation of scaling patterns derived from different measurement protocols.

    Main Results:

    • Certain horn length measurements are confounded by the inclusion of head size, leading to underestimation of allometry, especially in minor males.
    • Linear measurements excluding head size reveal a consistent positive allometry for horn growth.
    • Horn volume measurements also demonstrate strong positive allometry.

    Conclusions:

    • Accurate measurement techniques are essential for correctly interpreting horn allometry in Onthophagus taurus.
    • The data strongly support a positive allometry model for horn growth, refuting alternative 'reprogramming' hypotheses.
    • This study clarifies the developmental basis of horn size variation in this species.