Integrating resource selection information with spatial capture–recapture
Article first published online: 7 MAR 2013
Published 2013. This article is a US Government work and is in the public domain in the USA. Methods in Ecology and Evolution © 2013 British Ecological Society
Methods in Ecology and Evolution
Volume 4, Issue 6, pages 520–530, June 2013
How to Cite
Royle, J. A., Chandler, R. B., Sun, C. C., Fuller, A. K. (2013), Integrating resource selection information with spatial capture–recapture. Methods in Ecology and Evolution, 4: 520–530. doi: 10.1111/2041-210X.12039
- Issue published online: 7 JUN 2013
- Article first published online: 7 MAR 2013
- Accepted manuscript online: 12 FEB 2013 09:59PM EST
- Manuscript Received: 26 NOV 2012
- Manuscript Accepted: 24 JAN 2011
- animal movement;
- animal sampling;
- encounter probability;
- hierarchical modeling;
- marginal likelihood;
- resource selection;
- space usage;
- spatial capture–recapture
- Understanding space usage and resource selection is a primary focus of many studies of animal populations. Usually, such studies are based on location data obtained from telemetry, and resource selection functions (RSFs) are used for inference. Another important focus of wildlife research is estimation and modeling population size and density. Recently developed spatial capture–recapture (SCR) models accomplish this objective using individual encounter history data with auxiliary spatial information on location of capture. SCR models include encounter probability functions that are intuitively related to RSFs, but to date, no one has extended SCR models to allow for explicit inference about space usage and resource selection.
- In this paper we develop the first statistical framework for jointly modeling space usage, resource selection, and population density by integrating SCR data, such as from camera traps, mist-nets, or conventional catch traps, with resource selection data from telemetered individuals. We provide a framework for estimation based on marginal likelihood, wherein we estimate simultaneously the parameters of the SCR and RSF models.
- Our method leads to increases in precision for estimating parameters of ordinary SCR models. Importantly, we also find that SCR models alone can estimate parameters of RSFs and, as such, SCR methods can be used as the sole source for studying space-usage; however, precision will be higher when telemetry data are available.
- Finally, we find that SCR models using standard symmetric and stationary encounter probability models may not fully explain variation in encounter probability due to space usage, and therefore produce biased estimates of density when animal space usage is related to resource selection. Consequently, it is important that space usage be taken into consideration, if possible, in studies focused on estimating density using capture–recapture methods.