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Rensch's rule: linking intraspecific to evolutionary allometry.

Carolina Reyes-Puig1,2,3,4, Dean C Adams5, Urtzi Enriquez-Urzelai6

  • 1CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, Portugal.

Evolution; International Journal of Organic Evolution
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Summary
This summary is machine-generated.

Sexual differentiation in static allometric slopes is key to Rensch

Keywords:
allometric interceptallometric slopebody sizesexual dimorphismsimulationstrait evolution

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Area of Science:

  • Evolutionary Biology
  • Quantitative Genetics
  • Ecology

Background:

  • Sexual dimorphism, particularly sexual size dimorphism (SSD), refers to phenotypic differences between sexes.
  • Rensch's rule (RR) describes an allometric trend where SSD increases in male-larger taxa and decreases in female-larger taxa.
  • Intraspecific allometric variation, influenced by sexual and natural selection, may affect the expression of Rensch's rule.

Purpose of the Study:

  • To investigate how Rensch's rule emerges under specific allometric patterns of intraspecific sexual differentiation.
  • To determine the primary drivers of Rensch's rule and its converse.
  • To link intraspecific and evolutionary allometry using empirical data.

Main Methods:

  • Computer simulations were employed to model the emergence of Rensch's rule under varying allometric patterns.
  • Analysis of static allometry of different body parts in Mediterranean green lizards ( *Lacerta viridis* ).
  • Statistical examination of the contribution of sexual differentiation in static allometric slopes to Rensch's rule.

Main Results:

  • Sexual differentiation in static allometric slopes was identified as the main determinant of Rensch's rule.
  • Rensch's rule and its converse were observed to manifest in both body size and other traits.
  • Intraspecific sexual differentiation in static allometric slopes significantly contributed to Rensch's rule in Mediterranean green lizards.

Conclusions:

  • Sexual differentiation in static allometric slopes is a major parameter influencing evolutionary allometry.
  • The findings integrate simulation models and empirical data, corroborating the role of allometric slopes in evolutionary patterns.
  • Rensch's rule and its converse can be explained by intraspecific sexual differentiation in allometric slopes across various traits.