A test for paedomorphism in domestic pig cranial morphology

Evin, Allowen; Owen, Joseph; Larson, Greger; Debiais-Thibaud, Mélanie; Cucchi, Thomas; Viðarsdóttir, Una Strand; Dobney, Keith

doi:10.1098/rsbl.2017.0321

Cited by 28 publications

(34 citation statements)

References 23 publications

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“…7,59 In addition, some morphological traits of bonobos can be understood as reflecting juvenilized patterns of development, 60 as is also reported for domesticates. 61 In both the bonobo 62,63 and some of the best studied domesticates (dogs, 64 pigs, 65,66 and horses 67 ) "juvenilization" is recorded in specific features and not "globally" (contra Gould, 68 who suggested global paedomorphosis of humans relative to chimpanzees; see Hare et al 56 ).…”

Section: Chimpanzees and Bonobosmentioning

confidence: 99%

Evaluating the self‐domestication hypothesis of human evolution

Sánchez‐Villagra

Schaik

2019

Evolutionary Anthropology

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“Self‐domestication” has been invoked to understand important aspects of human evolution, integrating physiological, behavioral, and morphological information in a novel way. It proposes that selection for reduced aggression on animals undergoing domestication provides a model for selection favoring prosocial behaviors in humans and for a set of seemingly independent features, which arose as a result of developmental correlation. We review the history of the idea and examine patterns of domestication. A lack of empirical studies on evolutionary rates and variation thwarts meaningful comparison with domestication. The neural crest hypothesis for domestication has great explanatory power but it is difficult to test. We suggest a scenario in which the morphological byproducts of domestication can act as an honest signal of reduced xenophobia. Future studies should test if alternative explanations for the features deemed to result from self‐domestication are mutually exclusive and generate data to test predictions of these hypotheses.

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Section: Chimpanzees and Bonobosmentioning

confidence: 99%

Evaluating the self‐domestication hypothesis of human evolution

Sánchez‐Villagra

Schaik

2019

Evolutionary Anthropology

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“…In direct support of this latter effect, heterochronic developmental shifts are a consistent feature of the domestication syndrome-with changed timing of sexual maturity being especially common (Belyaev, 1979;Clutton-Brock, 1984;Hemmer, 1990;Jensen, 2006;Trut, 1999;Wilkins et al, 2014;Zeder, 2012Zeder, , 2015. Although debate continues as to whether domesticated heterochrony reliably leads to paedomorphism (adult retention of ancestral juvenile traits) (Evin et al, 2017), shifts in maturation would almost certainly influence sexual differences since these regularly emerge via sex-specific developmental rates and timing (Humphrey, 1998;Leigh, 1992;Plavcan, 2001). For instance, larger male body size is not a 'feature' composed from NCC-derived tissues, therefore, domesticated reduction in sexual size difference cannot follow directly from NCC-hypoplasia; however, hypoplasia of NCC-derived pituitary cells can explain these changes via altered endocrine regimes.…”

Section: Fig2mentioning

confidence: 99%

Masculinity and the mechanisms of human self-domestication

Gleeson

2017

Preprint

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Objectives:Pre-historic decline in human craniofacial masculinity has been proposed as evidence of selection for elevated sociability and a process of 'human self-domestication' thought to have promoted complex capacities including language, culture, and cumulative technological development. This follows experimental observation of similar changes in non-human animals under selection for reduced aggression. Two distinct domestication hypotheses posit developmental explanations, involving hypoplasia of embryonic neural crest cells (NCCs), and declining androgen influence, respectively. Here, I assess the operation and potential interactions between these two mechanisms and consider their role in enhanced human adaptation to a cooperative sociocultural niche. Methods: I provide a review and synthesis of related literature with a focus on physiological mechanisms effecting domesticated reductions in masculinity and sexual dimorphism.Further, I examine pre-historic modes of socio-sexual selection likely to drive human selfdomestication via reduced aggression and masculinity. Results:I find pluripotent NCCs provide progenitors for a wide range of vertebrate masculine features, acting as regular targets for sexually driven evolutionary change; suggesting domesticated hypoplasia of NCC-derived tissues would be sufficient to explain declines in masculine traits and features. However, lineage specific androgen receptor variability likely moderates these NCC-based effects. Conclusions:These findings extend theorised mechanisms driving noted physiological, morphological, and behavioural changes thought to indicate enhanced sociability and human and selfdomestication. Multiple current explanations for human sociability are consistent with physiological domestication under socio-sexual selection favouring dampened masculine physiology and behaviour as adaptations to an enhanced sociocultural niche. The analysis highlights multiple avenues for further investigation.Masculinity and the mechanisms of human self-domestication-Ben Gleeson 3

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“…The few available studies using a quantitative framework to examine postnatal ontogenetic data have rejected this hypothesis for pigs (Evin et al. ), and for dogs (Drake ; Geiger et al. ), and the first study to date to examine postnatal growth trajectories in domesticated mammals across a broad sample of clades has indicated the presence of types of heterochrony, but an absence of a universal pattern of change (Sánchez‐Villagra et al.…”

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confidence: 99%

The evolution of ontogenetic allometric trajectories in mammalian domestication

Wilson

2018

Evolution

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Morphological divergence of domesticated as compared to wild forms must result from changes in the ontogenetic process. Species-specific tests for heterochrony have rejected a single explanation of domestic forms representing juveniles of their wild relatives. Ontogenetic allometric trajectories for 12 pairs of wild and domestic mammals were examined using skull growth data for 1070 specimens, including representatives from all lineages in which domestication has occurred. A suite of tests were performed to quantify allometric disparity in wild and domestic forms and assess the extent and patterning of modification to allometric trajectories. Domestication has modified postnatal ontogenetic allometric trajectories in mammals, and has generated disparity, achieved through lengthening of trajectory slopes and alteration to slope angles. Allometric disparity was similar for domestic forms compared to their wild relatives, whereas the magnitude of dispersion along allometric vectors differed between precocial mammals and altricial mammals, underscoring the importance of life history and shared evolutionary history in patterns of ontogenetic variation. The results verify the importance of scaling in the morphological changes associated with domestication. The response to domestication for all measured trajectory parameters was variable across species, suggesting multiple pathways of change.

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A test for paedomorphism in domestic pig cranial morphology

Cited by 28 publications

References 23 publications

Evaluating the self‐domestication hypothesis of human evolution

Evaluating the self‐domestication hypothesis of human evolution

Masculinity and the mechanisms of human self-domestication

The evolution of ontogenetic allometric trajectories in mammalian domestication

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