Song trait similarity in great tits varies with social structure

L. Snijders, J.A.J. van der Eijk, E.P. van Rooij, P. de Goede, K. van Oers, M. Naguib

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)

Abstract

For many animals, long-range signalling is essential to maintain contact with conspecifics. In territorial species, individuals often have to balance signalling towards unfamiliar potential competitors (to solely broadcast territory ownership) with signalling towards familiar immediate neighbours (to also maintain so-called “dear enemy” relations). Hence, to understand how signals evolve due to these multilevel relationships, it is important to understand how general signal traits vary in relation to the overall social environment. For many territorial songbirds dawn is a key signalling period, with several neighbouring individuals singing simultaneously without immediate conflict. In this study we tested whether sharing a territory boundary, rather than spatial proximity, is related to similarity in dawn song traits between territorial great tits (Parus major) in a wild personality-typed population. We collected a large dataset of automatized dawn song recordings from 72 unique male great tits, during the fertile period of their mate, and compared specific song traits between neighbours and non-neighbours. We show here that both song rate and start time of dawn song were repeatable song traits. Moreover, neighbours were significantly more dissimilar in song rate compared to non-neighbours, while there was no effect of proximity on song rate similarity. Additionally, similarity in start time of dawn song was unrelated to sharing a territory boundary, but birds were significantly more similar in start time of dawn song when they were breeding in close proximity of each other. We suggest that the dissimilarity in dawn song rate between neighbours is either the result of neighbouring great tits actively avoiding similar song rates to possibly prevent interference, or a passive consequence of territory settlement preferences relative to the types of neighbours. Neighbourhood structuring is therefore likely to be a relevant selection pressure shaping variation in territorial birdsong.
Original languageEnglish
Article numbere0116881
Number of pages14
JournalPLoS ONE
Volume10
Issue number2
DOIs
Publication statusPublished - 2015

Keywords

  • parus-major
  • dawn chorus
  • bird song
  • honest advertisement
  • extrapair paternity
  • territory defense
  • neighbors
  • communication
  • behavior
  • songbirds

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