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dc.contributor.authorSmout, Sophie Caroline
dc.contributor.authorKing, Ruth
dc.contributor.authorPomeroy, Patrick
dc.identifier.citationSmout , S C , King , R & Pomeroy , P 2011 , ' Estimating demographic parameters for capture-recapture data in the presence of multiple mark types ' , Environmental and Ecological Statistics , vol. 18 , no. 2 , pp. 331-347 .
dc.identifier.otherPURE: 413463
dc.identifier.otherPURE UUID: eac68506-f236-42ff-82ed-69599ddbf7c9
dc.identifier.otherstandrews_research_output: 25598
dc.identifier.otherScopus: 79957609554
dc.identifier.otherORCID: /0000-0003-1603-5630/work/46569088
dc.description.abstractIn mark-recapture studies, various techniques can be used to uniquely identify individual animals, such as ringing, tagging or photo-identification using natural markings. In some long-term studies more than one type of marking procedure may be implemented during the study period. In these circumstances, ignoring the different mark types can produce biased survival estimates since the assumption that the different mark types are equally catchable (homogeneous capture probability across mark types) may be incorrect.We implement an integrated approach where we simultaneously analyse data obtained using three different marking techniques, assuming that animals can be cross-classified across the different mark types. We discriminate between competing models using the AIC statistic. This technique also allows us to estimate both relative mark-loss probabilities and relative recapture efficiency rates for the different marking methods.We initially perform a simulation study to explore the different biases that can be introduced if we assume a homogeneous recapture probability over mark type, before applying the method to a real dataset. We make use of data obtained from an intensive long-term observational study of UK female grey seals (Halichoerus grypus) at a single breeding colony, where three different methods are used to identify individuals within a single study: branding, tagging and photo-identification based on seal coat pattern or pelage.
dc.relation.ispartofEnvironmental and Ecological Statisticsen
dc.rights© Springer Science+Business Media, LLC 2010. The original publication is available at www.springerlink.comen
dc.subjectHalichoerus grypusen
dc.subjectMultiple mark typesen
dc.subjectIntegrated analysisen
dc.subjectQA Mathematicsen
dc.subjectQL Zoologyen
dc.titleEstimating demographic parameters for capture-recapture data in the presence of multiple mark typesen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. School of Mathematics and Statisticsen
dc.contributor.institutionUniversity of St Andrews. School of Biologyen
dc.contributor.institutionUniversity of St Andrews. Marine Alliance for Science & Technology Scotlanden
dc.contributor.institutionUniversity of St Andrews. Sea Mammal Research Uniten
dc.description.statusPeer revieweden

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