Domesticated animals often show the same collection of changed features when compared to their wild ancestors, an effect known as ‘domestication syndrome’.

But, over recent years, there’s been much debate among scientists about the validity of domestication syndrome, and the mechanisms used to explain it.

Researchers at The Australian National University (ANU) have evaluated competing scientific explanations for what caused common changes in ancient domesticated animals.

Their findings could improve our understanding of animal domestication, and have wider implications for evolutionary theory.

The authors argue currently popular theories give an oversimplified picture of evolutionary factors involved in animal domestication.

According to lead author and PhD researcher, Ben Gleeson , “it’s not that the idea of domestication syndrome is wrong, it’s just that we’ve had the wrong idea of how it works.”

Study co-author Associate Professor Laura Wilson added: “Domesticated animals usually have more reliable access to food, experience less natural competition for mating partners, and are protected from predators.”

These shared changes should often lead to similar changes in metabolism and growth; would reduce wild reproductive features and behaviours; and would lead to fewer traits, like camouflage, that help wild animals avoid being eaten.

The study has implications for wider evolutionary theory because domestication syndrome sometimes appears in wild animals, most commonly among isolated sub-populations, like those living on islands.

Some scientists argue these animals have ‘self-domesticated’ suggesting the same processes occurring under domestication must also sometimes happen in the wild.

Bonobos (a relative of the chimpanzee) are a famous example of this, but there are others, like urban foxes, and island rats.

It’s also been suggested that humans themselves show evidence of domestication syndrome, so this new work may help reveal some influences affecting human evolution too.

The authors highlight four main ways in which evolutionary selection is often changed when wild animals become domesticated. These involve factors like male competition and maternal stress.

They call their new explanation of domestication syndrome the ‘reproductive disruption’ hypothesis because these four selective influences maintain important reproductive functions and behaviours in most animal species. 

This research has been published in Proceedings of the Royal Society B.

You may also like

Article Card Image

Lighting up internet cables to help better prepare for earthquakes

A first-of-its-kind experiment could help make sure communities around the world are better prepared to deal with earthquakes. 

Article Card Image

ANU to boost the global hunt for gravitational waves

A new ANU facility will help scientists detect some of the most extreme events in the universe and put Australia "front and centre" of the exciting field of gravitational wave science.

Article Card Image

Early humans’ migration out of Africa could be crucial to modern medicine

Evolutionary changes that helped our early ancestors survive the first migration out of Africa could hold important clues for modern medicine.

Subscribe to ANU Reporter

Anu Logo

+61 2 6125 5111

The Australian National University, Canberra

CRICOS Provider: 00120C

ABN: 52 234 063 906

EDX Logo
Group of eight Australia Logo