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Interspecific allometry of sexual shape dimorphism in small-bodied and large-bodied geckos.

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Title: Interspecific allometry of sexual shape dimorphism in small-bodied and large-bodied geckos.
Authors: Glynne, Elizabeth1 (AUTHOR), Adams, Dean C1 (AUTHOR)
Source: Evolution. Mar2026, Vol. 80 Issue 3, p570-583. 14p.
Subjects: Allometry, Geckos, Genetic variation, Sexual dimorphism, Body size, Foraging behavior
Abstract: At macroevolutionary scales across species, sexual dimorphism often covaries with body size, generating allometric trends. Such patterns are most evident for body size dimorphism, while trends in sexual shape dimorphism remain underexamined. Additionally, how small body sizes (miniaturization) affects such patterns is largely unknown. We evaluated allometry in sexual shape dimorphism in two families of geckos to determine whether changes in body size associate with changes in shape dimorphism. Using surface scans of head shape from nearly 600 individuals across 99 species, we found considerable variation in levels of sexual shape dimorphism across taxa, with some species displaying little dimorphism and others exhibiting large sexual differentiation. Interspecific trends differed between the two families, with strong negative allometry in Sphaeorodactylidae (a family with many small-bodied species), while Phyllodactylidae (a family containing few small-bodied species) displayed isometry and no discernible trend. Notably, greater sexual shape dimorphism was displayed in small-bodied sphaerodactylid species, and corresponded with females exhibiting more robust heads; consistent with sex-specific foraging strategies and dietary differences observed in this group. Our study reveals that interspecific allometry in traits other than body size can have a pervasive influence on patterns of phenotypic diversity across the tree of life. [ABSTRACT FROM AUTHOR]
Copyright of Evolution is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Interspecific allometry of sexual shape dimorphism in small-bodied and large-bodied geckos.
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  Data: <searchLink fieldCode="JN" term="%22Evolution%22">Evolution</searchLink>. Mar2026, Vol. 80 Issue 3, p570-583. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Allometry%22">Allometry</searchLink><br /><searchLink fieldCode="DE" term="%22Geckos%22">Geckos</searchLink><br /><searchLink fieldCode="DE" term="%22Genetic+variation%22">Genetic variation</searchLink><br /><searchLink fieldCode="DE" term="%22Sexual+dimorphism%22">Sexual dimorphism</searchLink><br /><searchLink fieldCode="DE" term="%22Body+size%22">Body size</searchLink><br /><searchLink fieldCode="DE" term="%22Foraging+behavior%22">Foraging behavior</searchLink>
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  Label: Abstract
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  Data: At macroevolutionary scales across species, sexual dimorphism often covaries with body size, generating allometric trends. Such patterns are most evident for body size dimorphism, while trends in sexual shape dimorphism remain underexamined. Additionally, how small body sizes (miniaturization) affects such patterns is largely unknown. We evaluated allometry in sexual shape dimorphism in two families of geckos to determine whether changes in body size associate with changes in shape dimorphism. Using surface scans of head shape from nearly 600 individuals across 99 species, we found considerable variation in levels of sexual shape dimorphism across taxa, with some species displaying little dimorphism and others exhibiting large sexual differentiation. Interspecific trends differed between the two families, with strong negative allometry in Sphaeorodactylidae (a family with many small-bodied species), while Phyllodactylidae (a family containing few small-bodied species) displayed isometry and no discernible trend. Notably, greater sexual shape dimorphism was displayed in small-bodied sphaerodactylid species, and corresponded with females exhibiting more robust heads; consistent with sex-specific foraging strategies and dietary differences observed in this group. Our study reveals that interspecific allometry in traits other than body size can have a pervasive influence on patterns of phenotypic diversity across the tree of life. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Evolution is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1093/evolut/qpaf243
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      – Code: eng
        Text: English
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        PageCount: 14
        StartPage: 570
    Subjects:
      – SubjectFull: Allometry
        Type: general
      – SubjectFull: Geckos
        Type: general
      – SubjectFull: Genetic variation
        Type: general
      – SubjectFull: Sexual dimorphism
        Type: general
      – SubjectFull: Body size
        Type: general
      – SubjectFull: Foraging behavior
        Type: general
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      – TitleFull: Interspecific allometry of sexual shape dimorphism in small-bodied and large-bodied geckos.
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              M: 03
              Text: Mar2026
              Type: published
              Y: 2026
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