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Removal models accounting for temporary emigration

Zhou, M., McCrea, Rachel S., Matechou, E., Cole, D. J., Griffiths, Richard A. (2019) Removal models accounting for temporary emigration. Biometrics, 75 . pp. 24-35. ISSN 0006-341X. (doi:10.1111/biom.12961) (KAR id:64510)


Removal of protected species from sites scheduled for development is often a legal requirement in order to minimize the loss of biodiversity. The assumption of closure in the classic removal model will be violated if individuals become temporarily undetectable, a phenomenon commonly exhibited by reptiles and amphibians. Temporary emigration can be modeled using a multievent framework with a partial hidden process, where the underlying state process describes the movement pattern of animals between the survey area and an area outside of the study. We present a multievent removal model within a robust design framework which allows for individuals becoming temporarily unavailable for detection. We demonstrate how to investigate parameter redundancy in the model. Results suggest the use of the robust design and certain forms of constraints overcome issues of parameter redundancy. We show which combinations of parameters are estimable when the robust design reduces to a single secondary capture occasion within each primary sampling period. Additionally, we explore the benefit of the robust design on the precision of parameters using simulation. We demonstrate that the use of the robust design is highly recommended when sampling removal data. We apply our model to removal data of common lizards, Zootoca vivipara, and for this application precision of parameter estimates is further improved using an integrated model.

Item Type: Article
DOI/Identification number: 10.1111/biom.12961
Uncontrolled keywords: Abundance; Constraints; Hidden Markov models; Integrated modelling; Parameter redundancy; Robust design
Subjects: Q Science > QA Mathematics (inc Computing science)
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Mathematics, Statistics and Actuarial Science
Funders: NERC Environmental Omics Facility (
Depositing User: Rachel McCrea
Date Deposited: 16 Nov 2017 20:57 UTC
Last Modified: 04 Mar 2024 16:13 UTC
Resource URI: (The current URI for this page, for reference purposes)

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