Positive Allometry and the Prehistory of Sexual Selection

@article{Tomkins2010PositiveAA,
  title={Positive Allometry and the Prehistory of Sexual Selection},
  author={Joseph L. Tomkins and Natasha R Lebas and Mark P. Witton and David M. Martill and Stuart Humphries},
  journal={The American Naturalist},
  year={2010},
  volume={176},
  pages={141 - 148}
}
The function of the exaggerated structures that adorn many fossil vertebrates remains largely unresolved. One recurrent hypothesis is that these elaborated traits had a role in thermoregulation. This orthodoxy persists despite the observation that traits exaggerated to the point of impracticality in extant organisms are almost invariably sexually selected. We use allometric scaling to investigate the role of sexual selection and thermoregulation in the evolution of exaggerated traits of the… 

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References

SHOWING 1-10 OF 55 REFERENCES

SEXUAL SELECTION AND ALLOMETRY: A CRITICAL REAPPRAISAL Of THE EVIDENCE AND IDEAS

  • R. Bonduriansky
  • Psychology
    Evolution; international journal of organic evolution
  • 2007
Empirical evidence suggests that positive allometry may be the exception rather than the rule in sexual traits, that directional sexual selection does not necessarily lead to the evolution of negative allometry, and that many sexual traits exhibit sex differences in allometric intercept rather than slope.

Eye size in geckos: Asymmetry, allometry, sexual dimorphism, and behavioral correlates

Adult eye size varied interspecifically in correlation with parameters of behavioral ecology: eyes were significantly larger in nocturnal than in diurnal species, and significantly smaller in cursorial than in scansorial species.

Quantitative aspects of relative growth and sexual dimorphism in Protoceratops

The Upper Cretaceous Djadochta Formation of Mongolia has yielded a remarkable ontogenetic series of skulls and skeletons of the primitive ceratopsian dinosaur, Protoceratops andrewsi. Twenty-four

Convergent evolution of sexual shape dimorphism in Diptera

Comparisons of phenotypic variation in body shape in true flies suggest that a shared pattern of covariation among traits may have channeled the evolution of sexually dimorphic body elongation in these species, and static allometries may have been shaped by species‐specific selection pressures or genetic architectures.

Genic capture and resolving the lek paradox.

The Evolution of Body Size: What Keeps Organisms Small?

  • W. Blanckenhorn
  • Environmental Science, Biology
    The Quarterly Review of Biology
  • 2000
A review of the literature indicates a substantial lack of empirical evidence for these various mechanisms and highlights the need for experimental studies that specifically address the fitness costs of being large at the ecological, physiological, and genetic levels.

THE INTENSITY OF SEXUAL SELECTION PREDICTS WEAPON SIZE IN MALE BOVIDS

It is shown that male horn length depends on factors proposed to affect the mean mate number per mating male, correlating positively with group size and negatively with male territoriality, which suggests that whereas group size increases the opportunity for sexual selection, territoriality reduces it because territorial males are unable to follow and monopolize female groups as effectively as males in nonterritorial species.

Thermal Regulation in Sail Lizards

The sail of Dimetrodon grandis was the end form of an evolutionary series of pelycosaurs that had tended to develop increasingly large sails, with features strongly suggesting an early attempt at temperature regulation.

New materials of Dimetrodon teutonis (Synapsida: Sphenacodontidae) from the Lower Permian of Germany

Additional specimens of the sphenacodontid synapsid Dimetrodon teutonis. including a maxilla, dorsal vertebrae, scapulocoracoids, a humerus, and partial, articulated hindlimbs that consist of the

A new species of Dimetrodon (Synapsida: Sphenacodontidae) from the Lower Permian of Germany records first occurrence of genus outside of North America

This first record of the sphenacodontid synapsid Dimetrodon outside of North America provides not only additional biological evidence of a continuous Euramerican landmass during the Early Permian, but also the absence of any major physical or biological barrier to faunal interchange of terrestrial vertebrates.
...