Correction to 'Agonistic urban birds: elevated territorial aggression of urban song sparrows is individually consistent within a breeding period'.

Abstract

You have accessMoreSectionsView PDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmail Cite this article Davies Scott and Sewall Kendra B. 2016Correction to ‘Agonistic urban birds: elevated territorial aggression of urban song sparrows is individually consistent within a breeding period’Biol. Lett.122016090020160900http://doi.org/10.1098/rsbl.2016.0900SectionYou have accessCorrectionCorrection to ‘Agonistic urban birds: elevated territorial aggression of urban song sparrows is individually consistent within a breeding period’ Scott Davies Scott Davies Google Scholar Find this author on PubMed Search for more papers by this author and Kendra B. Sewall Kendra B. Sewall Google Scholar Find this author on PubMed Search for more papers by this author Scott Davies Scott Davies Google Scholar Find this author on PubMed Search for more papers by this author and Kendra B. Sewall Kendra B. Sewall Google Scholar Find this author on PubMed Search for more papers by this author Published:01 November 2016https://doi.org/10.1098/rsbl.2016.0900This article corrects the followingResearch ArticleAgonistic urban birds: elevated territorial aggression of urban song sparrows is individually consistent within a breeding periodhttps://doi.org/10.1098/rsbl.2016.0315 Scott Davies and Kendra B. Sewall volume 12issue 6Biology Letters01 June 2016Biol. Lett.12, 20160315. (Published online 21 June 2016). (doi:10.1098/rsbl.2016.0315)We have been made aware that the estimate of individual repeatability that we used in our study (i.e. the intraclass correlation coefficient) overestimates repeatability, and that calculating repeatability using the analysis of variance-based method, as described by Lessells & Boag [1]), is a more appropriate estimate. Consequently, we have recalculated repeatability using this more appropriate approach and describe these changes below.When pooling the behaviour of urban and rural birds, there was a non-significant trend towards low repeatability of territorial aggression score (r = 0.21, F52,105 = 1.54, p = 0.06). However, when considering each population alone there was a trend toward repeatability in rural, but not urban birds (urban: r = 0.02, F24,49 = 1.04, p = 0.46; rural: r = 0.28, F27,55 = 1.78, p = 0.07). Overall, when considering both populations simultaneously or each alone, territorial aggression score was not significantly repeatable within individuals.In our study, we considered ‘repeatability’ to be the proportion of variation that is reproducible among repeated measurements. By contrast, we use the term ‘consistency’ to refer to the consistent difference in population means when measuring the same individuals at multiple times. Although the territorial aggression of individual male song sparrows was not individually repeatable, urban male song sparrows were more territorially aggressive than their rural counterparts at both time points, making the difference in behaviour across habitat types consistent. Thus, our corrected results show consistency in population differences without individual repeatability of behavioural scores. Further, our title should read ‘…elevated territorial aggression of urban song sparrows is consistent within a breeding period’ in reference to the consistent difference in population means, not the proportion of variation that is reproducible among repeated measurements.Additional research is required to determine whether there is a habitat-related difference in the repeatability of territorial aggression in male song sparrows, which our re-analyses and prior work [2,3] suggest may be the case.Footnotes© 2016 The Author(s)Published by the Royal Society. All rights reserved.References1Lessells CM, Boag PT. 1987Unrepeatable repeatabilities: a common mistake. Auk 104, 116–121. (doi:10.2307/4087240) Crossref, ISI, Google Scholar2Scales J, Hyman J, Hughes M. 2011Behavioral syndromes break down in urban song sparrow populations. Ethology 117, 887–895. (doi:10.1111/j.1439-0310.2011.01943.x) Crossref, ISI, Google Scholar3Akçay Ç, Campbell SE, Beecher MD. 2014Individual differences affect honest signaling in a songbird. Proc. R. Soc. B 281, 20132496. (doi:10.1098/rspb.2013.2496) Link, ISI, Google Scholar Previous ArticleNext Article VIEW FULL TEXT DOWNLOAD PDF FiguresRelatedReferencesDetailsRelated articlesAgonistic urban birds: elevated territorial aggression of urban song sparrows is individually consistent within a breeding period01 June 2016Biology Letters This IssueNovember 2016Volume 12Issue 11 Article InformationDOI:https://doi.org/10.1098/rsbl.2016.0900PubMed:27903781Published by:Royal SocietyOnline ISSN:1744-957XHistory: Published online01/11/2016Published in print30/11/2016 License:© 2016 The Author(s)Published by the Royal Society. All rights reserved. Citations and impact Subjectsbehaviourecology Large datasets are available through Biology Letters' partnership with Dryad