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4 results for “Out-group threat”
Data from: Experimental field evidence that out-group threats influence within-group behaviour
In social species, conspecific outsiders present various threats to groups and their members. These out-group threats are predicted to affect subsequent within-group interactions (e.g. affiliation and aggression) and individual behaviour (e.g. foraging and vigilance decisions). However, experimental investigations of such consequences are rare, especially in natural conditions. We used field-based call playbacks and faecal presentations on habituated wild dwarf mongooses (Helogale parvula)—a cooperatively breeding, territorial species—to examine post-interaction responses to the simulated threat of a rival group. Dwarf mongooses invested more in grooming of groupmates, foraged closer together and more regularly acted as sentinels (a raised guard) after encountering indicators of rival-group presence compared to control conditions. These behavioural changes likely arise from greater anxiety and, in the case of increased vigilance, the need to seek additional information about the threat. The influence of an out-group threat lasted at least 1 h but individuals of different dominance status and sex responded similarly, potentially because all group members suffer costs if a contest with rivals is lost. Our results provide field-based experimental evidence from wild animals that out-group threats can influence within-group behaviour and decision-making, and suggest the need for greater consideration of the lasting impacts of social conflict.
Data from: Experimental field evidence that out-group threats influence within-group behaviour
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Data from: Out-group threat promotes within-group affiliation in a cooperative fish
In social species, conflict with outsiders is predicted to affect within-group interactions, and thus influence group dynamics and the evolution and maintenance of sociality. While empirical evidence exists for a relationship between out-group conflict and intragroup behaviour in humans, experimental tests in other animals are rare. In a model fish system, we show that simulated out-group intrusions cause post-conflict increases in intragroup affiliation, but no changes in post-conflict intragroup aggression. Post-conflict affiliation was greater following intrusions by neighbouring compared to non-neighbouring individuals; neighbours represent greater threats to the dominance rank and breeding success of residents, and are visible in the aftermath of the intrusion. By providing strong evidence of a link between out-group conflict and post-conflict intragroup behaviour, and demonstrating that intragroup affiliation is affected by the nature of the out-group intrusion, our study shows the importance of considering post-conflict behaviour for our understanding of cooperation and social structure.
Data from: Out-group threat promotes within-group affiliation in a cooperative fish
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