Degree of synchronization of tree sparrows in flocks under different predation risk

Ferenc Mónus, Zoltán Barta

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

When exposed to predators animals often benefit from synchronized movements and behaviour. In this study, we investigated the level of synchronization at arrivals at and departures from a feeding platform in flock-feeding tree sparrows (Passer montanus) under two different conditions; near to a protective cover or far from it. Sparrow flocks spent 43% less time in a feeding bout, and waited 30% more between bouts, far from the cover than near to it. The relationship of vigilance and flock size was different between the two conditions; the proportion of time allocated to vigilance increased more with decreasing flock size when far from the cover than when near to it. These results suggest that sparrows perceived higher predation risk when fed farther away from the protective cover. Furthermore, we found that far from the cover arrivals of sparrows were 79% more synchronized than when close to the cover. Finally, we did not find significant difference between the two feeding conditions in the synchronization at the departure. Possibly, due to its escape function, departures may be as synchronized as possible, even when feeding near to the protective cover.

Original languageEnglish
Pages (from-to)733-744
Number of pages12
JournalBehaviour
Volume148
Issue number5-6
DOIs
Publication statusPublished - Jun 27 2011

Keywords

  • foraging
  • predation risk
  • synchronized behaviour
  • tree sparrow

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Behavioral Neuroscience

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