Ape 'vocabularies' shaped by social mingling -- like in humans
Social mingling shapes and transforms the `vocabularies' of apes, just
like in humans

Date:
March 21, 2022
Source:
University of Warwick
Summary:
Social mingling shapes and transforms the 'vocabularies' of apes,
just like in humans, according to new research.



FULL STORY ========================================================================== Social mingling shapes and transforms the 'vocabularies' of apes,
just like in humans, according to new research led by the University
of Warwick.


==========================================================================
In a paper published by Nature Ecology and Evolution, researchers have
proved that wild orangutans demonstrate distinct 'vocal personalities'
that are moulded depending on the social groups in which individuals
live and communicate -- as opposed to a fixed repertoire of instinctive, automated calls as traditionally presumed.

This breakthrough, led by Dr Adriano R. Lameira from Warwick's Department
of Psychology, further establishes a direct developmental vocal continuum between us and our evolutionary ancestors.

Living alongside orangutan communities in the swamps and low rainforests
of Borneo and Sumatra in Southeast Asia, Dr Lameira and his research team recorded the calls of around 70 individual apes across six populations
(the largest sample ever analysed in this type of study on the vocal
behaviour of great apes).

The orangutan populations differed naturally in population density, from
groups that socialised intensely to those that were more dispersed. In high-density populations, the orangutans communicated using a large
variety of original calls, trying out lots of novel sound variants that
were continually modified or dropped.

By contrast, the orangutans in sparser, lower density populations favoured
more established, conventional calls. While these more dispersed groups
did not experiment with such a huge number of novel sounds, when they
did introduce a new call variant, they kept it, and therefore their call repertoire was richer that orangutans in high-density populations who continuous discard new call variants.

If orangutan call communication is socially shaped, then this was also
likely the case with our direct, extinct ape-like ancestors. Social
influence - - though predictably modest at first before the rise of
a fully operational primitive language -- could have then increased
steadily, ultimately leading to the myriad ways in which language is
determined by those who surround us.

Dr Adriano R. Lameira, lead author and Assistant Professor at the
University of Warwick's Department of Psychology, commented: "Great apes,
both in the wild and captivity, are finally helping us to resolve one
of the longest-standing puzzles in science -- the origin and evolution
of language. We can now start conceiving of a gradual path that likely
led to the rise of the talking ape, us, instead of having to attribute
our unique verbal skills and advanced cognition to divine intervention
or random genetic jackpot.

"Many more clues await us in the lives of our closest living relatives,
as long as we manage to guarantee their protection and their preservation
in the wild.

Each disappearing population will take with it unretrievable glimpses
of the evolutionary history of our species."

========================================================================== Story Source: Materials provided by University_of_Warwick. Note: Content
may be edited for style and length.


========================================================================== Journal Reference:
1. Lameira, A.R., Santamari'a-Bonfil, G., Galeone, D. et al. Sociality
predicts orangutan vocal phenotype. Nat Ecol Evol, 2022 DOI:
10.1038/ s41559-022-01689-z ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2022/03/220321132149.htm

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