Experimental evidence that sentinel behaviour is affected by risk

A. R. Ridley, N. J. Raihani, M. B V Bell

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Sentinels are a conspicuous feature of some cooperative societies and are often assumed to provide benefits in terms of increased predator detection. Similar to other cooperative behaviours, variation in investment in sentinel behaviour should reflect variation in the benefits of such behaviour. However, evidence for this is inconclusive: to date experiments have manipulated the cost of sentinel behaviour, and considerations of changes in the benefits of sentinel activity on investment patterns are lacking. Here, we experimentally manipulated the benefits of sentinel behaviour in the cooperatively breeding pied babbler (Turdoides bicolor) to assess whether this had any impact on sentinel activity. We simulated the presence of an unseen predator using playbacks of heterospecific alarm calls, and the presence of an actual predator using a model snake. In both cases, the increase in perceived predation risk caused an increase in sentinel activity, demonstrating that investment in sentinel activity increases when the benefits are greater.

Original languageEnglish
Pages (from-to)445-448
Number of pages4
JournalBiology Letters
Volume6
Issue number4
DOIs
Publication statusPublished - 23 Aug 2010

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Keywords

  • Behavioural response
  • Pied babbler
  • Predator detection
  • Sentinel activity

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