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2016 ; 6
(ä): 22046
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Enduring voice recognition in bonobos
#MMPMID26911199
Keenan S
; Mathevon N
; Stevens JM
; Guéry JP
; Zuberbühler K
; Levréro F
Sci Rep
2016[Feb]; 6
(ä): 22046
PMID26911199
show ga
Long-term social recognition is vital for species with complex social networks,
where familiar individuals can encounter one another after long periods of
separation. For non-human primates who live in dense forest environments, visual
access to one another is often limited, and recognition of social partners over
distances largely depends on vocal communication. Vocal recognition after years
of separation has never been reported in any great ape species, despite their
complex societies and advanced social intelligence. Here we show that bonobos,
Pan paniscus, demonstrate reliable vocal recognition of social partners, even if
they have been separated for five years. We experimentally tested bonobos'
responses to the calls of previous group members that had been transferred
between captive groups. Despite long separations, subjects responded more
intensely to familiar voices than to calls from unknown individuals - the first
experimental evidence that bonobos can identify individuals utilising
vocalisations even years after their last encounter. Our study also suggests that
bonobos may cease to discriminate between familiar and unfamiliar individuals
after a period of eight years, indicating that voice representations or interest
could be limited in time in this species.
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