Selective breeding in domestic dogs: How selecting for a short face impacted canine neuroanatomy.

The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology
Molly C SelbaValerie B DeLeon

Abstract

The range of cranial morphology seen in domestic dogs (Canis lupus familiaris) is a direct result of thousands of years of selective breeding. This article is the first to investigate how selection for reduced faces in brachycephalic dogs impacted the neuroanatomy of the canine brain through the analysis of endocasts. Previous research has demonstrated global effects on the shape of the bony cranium as the result of these breeding practices; however, these studies have largely focused on the bony structures of the skull and failed to consider the influence of facial reduction on the soft tissues of the brain. We generated endocasts from an existing set of clinically-obtained CT scans representing a variety of dogs with various cranial morphologies. These dogs represented four breeds as well as a comparative sample of dogs of unknown breed. We recorded three-dimensional coordinate data for 31 landmarks representing various gyri, sulci, and other neuroanatomical landmarks that allowed us to analyze differences in shape of the endocasts. Through geometric morphometric analyses, we determined that the endocast shape variance in this sample is correlated with cephalic index, and thus the selection for facial reduction has caused a p...Continue Reading

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Citations

Oct 2, 2020·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Christiane JacquemettonBlaire Van Valkenburgh
Aug 20, 2021·Integrative Organismal Biology·M GeigerM R Sánchez-Villagra

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