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Daily variation in behavioural lateralization is linked to predation stress in a coral reef fish
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Orientador(es)
Resumo(s)
Behavioural lateralization, the preferential use of one side of the body or one of the limbs, is a trait
common in vertebrates, and is often expressed as a turning bias in fishes. Recent studies have demonstrated
considerable plasticity in lateralization, inferring the role of predation pressure as a key driver of
this plasticity over short periods (i.e. days). Such plasticity may be expected if predator pressure is highly
variable through space and time and can provide prey with a distinct advantage.We know that increased
turning bias is linked with better escape performance, but we do not know the extent to which prey can
adjust this trait to match temporal variation in risk. Here we trained juvenile Ambon damselfish to
recognize different temporal patterns of risk throughout the day and asked whether their degree of
lateralization changed according to this pattern. Damselfish that were taught that midday was risky
showed a stronger turning bias at midday than in the evening, whereas damselfish that were taught that
evening was risky showed a stronger turning bias in the evening than at midday. Subsequently, we found
that fish exposed to cortisol expressed a greater degree of turning bias. Our results suggest that predation
stress may be a key factor determining the degree of behavioural lateralization in vertebrates.
Descrição
Palavras-chave
Diel pattern Alarm cue Laterality Predation risk Temporal variation Turning bias
Contexto Educativo
Citação
Animal Behaviour, 133, 189-193. Doi: 10.1016/j.anbehav.2017.09.020
Editora
Elsevier Masson