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Journal of anatomy2018; 232(4); 657-673; doi: 10.1111/joa.12772

The impact of artificial selection on morphological integration in the appendicular skeleton of domestic horses.

Abstract: The relationships between the different component parts of organisms, such as the sharing of common development or function, produce a coordinated variation between the different traits. This morphological integration contributes to drive or constrain morphological variation and thus impacts phenotypic diversification. Artificial selection is known to contribute significantly to phenotypic diversification of domestic species. However, little attention has been paid to its potential impact on integration patterns. This study explores the patterns of integration in the limb bones of different horse breeds, using 3D geometric morphometrics. The domestic horse is known to have been strongly impacted by artificial selection, and was often selected for functional traits. Our results confirm that morphological integration among bones within the same limb is strong and apparently partly produced by functional factors. Most importantly, they reveal that artificial selection, which led to the diversification of domestic horses, impacts covariation patterns. The influence of selection on the patterns of covariation varies along the limbs and modulates bone shape, likely due to a differential ligament or muscle development. These results highlight that, in addition to not being constrained by a strong morphological integration, artificial selection has modulated the covariation patterns according to the locomotor specificities of the breeds. More broadly, it illustrates the interest in studying how micro-evolutionary processes impact covariation patterns and consequently contribute to morphological diversification of domestic species.
Publication Date: 2018-01-08 PubMed ID: 29315551PubMed Central: PMC5835793DOI: 10.1111/joa.12772Google Scholar: Lookup
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  • Journal Article

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research investigates how artificial selection, such as breeding, affects the shape and function of the appendicular skeleton (limbs) of domestic horses, revealing that such selection significantly influences the patterns of covariation (changes in the structure) of the limbs, leading to changes in bone shape and function.

Research Objective

  • The research aims to understand the impact of artificial selection on the structural and functional relationships between different parts of organisms, in this case, the appendicular skeleton of domestic horses. The primary focus is on how variation in these structures is affected by artificial selection and what impact this process has on phenotypic diversification, i.e., the variation in physical characteristics within a species.

Methods

  • The researchers applied 3D geometric morphometrics, a method used to quantify shape in 3D space, to examine the patterns of integration, or how different traits function together, in the limb bones of various horse breeds.

Findings

  • The study found that artificial selection strongly influences covariation, or the degree to which physical traits change together, which in turn impacts the diversification of physical traits in domestic horses.
  • It was also discovered that this influence varies along the limb, causing modulations in the shape of the bones, possibly as a result of different ligament or muscle development.
  • The results revealed that, in addition to not being constrained by a strong morphological integration, artificial selection has modulated the covariation patterns according to the locomotor specificities of the breeds.

Significance

  • This research is significant as it not only reinforces the understanding that artificial selection contributes to phenotypic diversification, but also highlights how these micro-evolutionary processes impact covariation patterns. It emphasizes the need for further studies on how these changes contribute to the morphological diversification of domestic species.

Cite This Article

APA
Hanot P, Herrel A, Guintard C, Cornette R. (2018). The impact of artificial selection on morphological integration in the appendicular skeleton of domestic horses. J Anat, 232(4), 657-673. https://doi.org/10.1111/joa.12772

Publication

ISSN: 1469-7580
NlmUniqueID: 0137162
Country: England
Language: English
Volume: 232
Issue: 4
Pages: 657-673

Researcher Affiliations

Hanot, Pauline
  • UMR 7209 Archéozoologie et Archéobotanique: Sociétés, Pratiques et Environnements (CNRS, MNHN), Muséum national d'Histoire naturelle, Sorbonne Universités, Paris, France.
Herrel, Anthony
  • UMR 7179 Mécanismes Adaptatifs et Évolution (CNRS, MNHN), Muséum national d'Histoire naturelle, Sorbonne Universités, Paris, France.
Guintard, Claude
  • École Nationale Vétérinaire, de l'Agroalimentaire et de l'Alimentation, Nantes Atlantique - ONIRIS, Nantes Cedex 03, France.
Cornette, Raphaël
  • UMR 7205 Institut de Systématique, Évolution, Biodiversité (CNRS, MNHN, UPMC, EPHE), Muséum national d'Histoire naturelle, Sorbonne Universités, Paris, France.

MeSH Terms

  • Animals
  • Biodiversity
  • Body Size
  • Bone and Bones / anatomy & histology
  • Breeding
  • Extremities / anatomy & histology
  • Extremities / growth & development
  • Female
  • Horses / anatomy & histology
  • Horses / growth & development
  • Ligaments / growth & development
  • Ligaments / physiology
  • Locomotion / physiology
  • Male
  • Muscle Development / physiology
  • Phenotype

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Citations

This article has been cited 11 times.
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