Generalized spatial mark–resight models with an application to grizzly bears

• Published in: Journal of Applied Ecology
• Main Authors: Whittington, Jesse, Hebblewhite, Mark, Chandler, Richard B.
• Other Authors: Lentini, Pia, Parks Canada, Canadian Pacific Railway
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2017
• Subjects: Canada; Ursus arctos
• Online Access: http://dx.doi.org/10.1111/1365-2664.12954; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2664.12954; https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.12954

Abstract The high cost associated with capture–recapture studies presents a major challenge when monitoring and managing wildlife populations. Recently developed spatial mark–resight ( SMR ) models were proposed as a cost‐effective alternative because they only require a single marking event. However, existing SMR models ignore the marking process and make the tenuous assumption that marked and unmarked populations have the same encounter probabilities. This assumption will be violated in most situations because the marking process results in different spatial distributions of marked and unmarked animals. We developed a generalized SMR model that includes sub‐models for the marking and resighting processes, thereby relaxing the assumption that marked and unmarked populations have the same spatial distributions and encounter probabilities. Our simulation study demonstrated that conventional SMR models produce biased density estimates with low credible interval coverage (CIC) when marked and unmarked animals had differing spatial distributions. In contrast, generalized SMR models produced unbiased density estimates with correct CIC in all scenarios. We applied our SMR model to grizzly bear ( Ursus arctos ) data where the marking process occurred along a transportation route through Banff and Yoho National Parks, Canada. Twenty‐two grizzly bears were trapped, fitted with radiocollars and then detected along with unmarked bears on 214 remote cameras. Closed population density estimates (posterior median ± 1 SD ) averaged from 2012 to 2014 were much lower for conventional SMR models (7.4 ± 1.0 bears per 1,000 km 2 ) than for generalized SMR models (12.4 ± 1.5). When compared to previous DNA ‐based estimates, conventional SMR estimates erroneously suggested a 51% decline in density. Conversely, generalized SMR estimates were similar to previous estimates, indicating that the grizzly bear population was relatively stable. Synthesis and applications . Mark–resight studies often cost less than capture–recapture studies, ...