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Facial Recognition in a Group-Living Cichlid Fish
#MMPMID26605789
Kohda M
; Jordan LA
; Hotta T
; Kosaka N
; Karino K
; Tanaka H
; Taniyama M
; Takeyama T
PLoS One
2015[]; 10
(11
): e0142552
PMID26605789
show ga
The theoretical underpinnings of the mechanisms of sociality, e.g.
territoriality, hierarchy, and reciprocity, are based on assumptions of
individual recognition. While behavioural evidence suggests individual
recognition is widespread, the cues that animals use to recognise individuals are
established in only a handful of systems. Here, we use digital models to
demonstrate that facial features are the visual cue used for individual
recognition in the social fish Neolamprologus pulcher. Focal fish were exposed to
digital images showing four different combinations of familiar and unfamiliar
face and body colorations. Focal fish attended to digital models with unfamiliar
faces longer and from a further distance to the model than to models with
familiar faces. These results strongly suggest that fish can distinguish
individuals accurately using facial colour patterns. Our observations also
suggest that fish are able to rapidly (? 0.5 sec) discriminate between familiar
and unfamiliar individuals, a speed of recognition comparable to primates
including humans.
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