What is domestication?

Purugganan, Michael D.

doi:10.1016/j.tree.2022.04.006

Cited by 54 publications

(44 citation statements)

References 82 publications

(140 reference statements)

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“…Some species, such as maize and plum, show a gradual expansion of their environmental niche and its geographic projections along their domestication gradient (Miller & Knouft, 2006; Calfee et al, 2021; Locqueville et al, 2022; Purugganan, 2022). By contrast, our results indicate that chile pepper domestication may have involved environmental subsampling of the wild climatic and geographic distributions such that landrace distribution is now mostly nested within the wild one.…”

Section: Discussionmentioning

confidence: 99%

“…The copyright holder for this preprint this version posted December 2, 2022. ; https://doi.org/10. 1101/2022 An ideal way to approach the shifts in geographic distribution over the course of domestication is with ecological niche models (ENM). ENMs seek to describe the multidimensional niche space of a species (Soberón & Nakamura, 2009, Peterson & Soberón, 2012.…”

Section: Introductionmentioning

confidence: 99%

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Capturing the distribution as it shifts: chile pepper (Capsicum annuumL.) domestication gradient meets geography

Ainsworth

Scheppler

Moreno‐Letelier

et al. 2022

Preprint

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Aim: Domestication is an ongoing well-described process. However, while many have studied the changes domestication causes in the genetic landscape, few have explored the way domestication changes the geographic landscape in which the plants exist. Therefore, the goal of this study was to understand how the domestication status changed the suitable geographic space of chile pepper in its center of origin. Methods: Capsicum annuum is a major crop species globally whose domestication center, Mexico, has been well studied. This provides a unique opportunity to explore the degree to which ranges of different domestication classes diverged and how these ranges might be altered by climate change. To this end, we created ecological niche models for four domestication classes (wild, semiwild, landrace, modern cultivar) based on present climate and future climate scenarios for 2050, 2070, and 2090. Results: Considering present environment, we found substantial overlap in the geographic niches of all the domestication gradient categories. Yet, there were also clear unique environmental and geographic aspects to the current ranges. Wild and commercial varieties were at ease in desert conditions as opposed to landraces. With projections into the future, habitat was lost asymmetrically, with wild, semiwild and landraces at far greater risk than modern cultivars. Further, we identified areas where future suitability overlap between landraces and wilds is expected to decouple. Main conclusions: While range expansion is widely associated with domestication, there is little support of a constant niche expansion (either in environmental or geographical space) throughout the domestication gradient. However, a shift to higher altitudes with cooler climate was identified for landraces. The clear differences in environmental adaptation, such as higher mean diurnal range and precipitation seasonality along the domestication gradient classes and their future potential range shifts show the need to increase conservation efforts, particularly to preserve landraces and semiwild genotypes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Capturing the distribution as it shifts: chile pepper (Capsicum annuumL.) domestication gradient meets geography

Ainsworth

Scheppler

Moreno‐Letelier

et al. 2022

Preprint

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“…To begin with, the parallelism between domesticates and other 'socially tolerant' (tamed) species not under the control of humans has been successfully established 28 . Moreover, some of the most iconic domesticates (dogs, cats, and arguably others; 24 ) are now thought to have initiated their path towards domestication prior to any human control or intention (see also 29 ). In particular, it is now claimed for a growing number of domesticated species that it is their loss of fear towards humans that constituted the first step towards their current niche.…”

Section: What the Hypothesis Is (Not)mentioning

confidence: 99%

Self-Domestication: From Analogy to Homology via Genomics

Boeckx¹,

Vitriolo²,

Testa³

2022

Preprint

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This paper seeks to clarify central aspects of the “self-domestication” hypothesis and its implications for the evolution of our species. It does so by reconstructing the evolutionary trajectory of the intuition at the heart of the hypothesis, showing what the hypothesis is not, and then proceeding to a critical review of the molecular mechanisms that have been suggested to underlie domestication processes. We propose a pre-domestication phase which can solve several lines of criticism around (self)-domestication, schematically outline the most parsimonious set of events that could have led to domestication in our lineage, and highlight specific genes within this framework, that can serve as regulatory hubs for experimental testing of human evolution in physiologically relevant models that recapitulate the key cellular lineages involved. Crucially, we show how (ancient) genomics can help us go beyond analogies and make the original intuition behind “self-domestication” stronger.

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“…Domestication has led to a reliance of animals on humans for provision of food, shelter, safety and social interactions in a mutualistic relationship [ 4 ]. Thus, it would be advantageous for non-human animals to be able to interpret human facial expressions for facilitation of this relationship.…”

Section: Introductionmentioning

confidence: 99%

Can Ponies (Equus Caballus) Distinguish Human Facial Expressions?

Merkies

Sudarenko

Hodder

2022

Animals

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Communication within a species is essential for access to resources, alerting to dangers, group facilitation and social bonding; human facial expressions are considered to be an important factor in one’s ability to communicate with others. Evidence has shown that dogs and horses are able to distinguish positive and negative facial expressions by observing photographs of humans, however there is currently no research on how facial expressions from a live human are perceived by horses. This study investigated how ponies distinguish facial expressions presented by live actors. Trained actors (n = 2), using the human Facial Action Coding System, displayed four facial expressions (anger, sadness, joy and neutral) individually to twenty ponies. Heart rate and behaviors of the ponies including first monocular eye look, eye look duration (right and left side bias) and latency to approach were observed. A generalized linear mixed model (GLIMMIX) using Sidak’s multiple comparisons of least squared means determined that when exposed to anger expressions ponies looked more often with their left eye first and when exposed to joy, looked more often with their right eye first (p = 0.011). The ponies spent more time looking at angry expressions (p = 0.0003) in comparison to other expressions. There was no variation in heart rate across expressions (p > 0.89). Regardless of human facial expression, ponies looked longer (p = 0.0035), took longer to approach (p = 0.0297) and displayed more oral behaviours (p < 0.0001) with one actor than the other indicating increased arousal or negative valence. Ponies with more experience as a lesson mount had lower heart rates (p < 0.0001) carried their head lower (p < 0.0001), kept their left ear on the actor (p < 0.03) and exhibited more oral behaviours (p < 0.0001) than ponies with less experience. This study demonstrates that ponies are able to distinguish facial expressions presented by a live human, but other factors also contribute to their responses to humans.

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What is domestication?

Cited by 54 publications

References 82 publications

Capturing the distribution as it shifts: chile pepper (Capsicum annuumL.) domestication gradient meets geography

Capturing the distribution as it shifts: chile pepper (Capsicum annuumL.) domestication gradient meets geography

Self-Domestication: From Analogy to Homology via Genomics

Can Ponies (Equus Caballus) Distinguish Human Facial Expressions?

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