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Estimating abundance from multiple sampling capture-recapture data via a multi-state multi-period stopover model

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Author(s)

Hannah Worthington, Rachel McCrea, Ruth King, Richard Griffiths

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Abstract

Capture-recapture studies often involve collecting data on numerous capture occasions over a relatively short period of time. For many study species this process is repeated, for example, annually, resulting in capture information spanning multiple sampling periods. To account for the different temporal scales, the robust design class of models have traditionally been applied providing a framework in which to analyse all of the available capture data in a single likelihood expression. However, these models typically require strong constraints, either the assumption of closure within a sampling period (the closed robust design) or conditioning on the number of individuals captured within a sampling period (the open robust design). For real datasets these assumptions may not be appropriate. We develop a general modelling structure that requires neither assumption by explicitly modelling the movement of individuals into the population both within and between the sampling periods, which in turn permits the estimation of abundance within a single consistent framework. The flexibility of the novel model structure is further demonstrated by including the computationally challenging case of multi-state data where there is individual time-varying discrete covariate information. We derive an efficient likelihood expression for the new multi-state multi-period stopover model using the hidden Markov model framework. We demonstrate the significant improvement in parameter estimation using our new modelling approach in terms of both the multi-period and multi-state components through both a simulation study and a real dataset relating to the protected species of great crested newts, Triturus cristatus.
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Original languageEnglish
Pages (from-to)2043-2064
Number of pages22
JournalAnnals of Applied Statistics
Volume13
Issue number4
Early online date28 Nov 2019
DOIs
Publication statusPublished - Dec 2019

    Research areas

  • Hidden Markov model, Great crested newts, Multi-state data, Individual time-varying discrete covariate

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