Socialized sub-groups in a temporary stable Raven flock?

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• 作者：Anna Braun (1) (2)
  Thomas Walsdorff (1) (3)
  Orlaith N. Fraser (1)
  Thomas Bugnyar (1) (2)
  
• 关键词：Common Raven ; Fission–fusion dynamics ; Group life ; Complex societies ; Corvids
• 刊名：Journal of Ornithology
• 出版年：2012
• 出版时间：August 2012
• 年：2012
• 卷：153
• 期：1/suppl
• 页码：97-104
• 全文大小：253KB
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• 作者单位：Anna Braun (1) (2)
  Thomas Walsdorff (1) (3)
  Orlaith N. Fraser (1)
  Thomas Bugnyar (1) (2)
  
  1. University of Vienna, Vienna, Austria
  2. Konrad Lorenz Research Station, Gruenau, Austria
  3. Université catholique de Louvain, Louvain-la-Neuve, Belgium
  
• ISSN：2193-7206

文摘

A complex social life serves as one of the main driving forces behind the evolution of higher cognitive abilities in vertebrates. In birds, however, data are primarily derived from captive animals, which strongly contrast with free-flying birds in terms of the number of interaction partners as well as available space. In captivity, Common Raven Corvus corax, nonbreeder groups show strong social bonds and complex tactical manoeuvring, whereas wild non-breeders are thought to resemble anonymous aggregations. Over 2?years, we observed a free-flying population of Ravens that visits a game park in the northern Alps. We here focus on the daily fission–fusion dynamics, individual spacing, and the influence of spacing on the birds-agonistic and affiliative behaviour. The composition of marked Ravens in the local population changed slowly but constantly, although often remaining stable for several weeks. Birds only flocked for feeding, mobbing and roosting, and spent the rest of the day in loose aggregations, characterised by temporary small subgroups of 2- individuals. Aggression was high during crowd foraging but low outside of a feeding context. Affiliative behaviours, such as sitting within reaching distance, allo-preening and social play, were observed particularly in the small subgroups. These findings suggest that Raven aggregations are not as unstructured as previously thought. Birds may spend time and/or interact affilliatively with multiple individuals during the day. This, along with temporary stability in group composition, provides the opportunity for social relationships to develop, and enables the existence of socialised subgroups within free-flying Raven aggregations.