Rensch's rule

Rensch's rule

Rensch's rule is an allometric law concerning the relationship between the extent of sexual size dimorphism (SSD) and which sex is larger. Across species within a lineage, size dimorphism will increase with increasing body size when the male is the larger sex, and decrease with increasing average body size when the female is the larger sex.

Examples of phylogenetic lineages that appear to follow this rule include primates, pinnipeds, and artiodactyls (Fairbairn 1997).

References

Fairbairn, D.J. 1997. Allometry for Sexual Size Dimorphism: Pattern and Process in the Coevolution of Body Size in Males and Females. "Annu. Rev. Ecol. Syst." 28:659-687.


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