Estimating population parameters for the Critically Endangered Bermuda skink using robust design capture–mark–recapture modelling. Issue 1 (27th January 2021)

• Record Type: Journal Article
• Authors: Turner, Helena; Griffiths, Richard A.; Outerbridge, Mark E.; Garcia, Gerardo
• Is Part Of: Oryx. Volume 55:Issue 1(2021)
• Page Start: 81
• Page End: 88
• Publication Date: 2021-01-27
• Subjects: Bermuda skink, -- capture–mark–recapture analysis, -- conservation, -- Plestiodon longirostris, -- population monitoring, -- reptile, -- robust design, -- survival; Wildlife conservation -- Periodicals; Nature conservation -- Periodicals; 639.9
• DOI: 10.1017/S0030605318001485
• Languages: English
• ISSNs: 0030-6053

Abstract

Abstract: Reliably estimating population parameters for highly secretive or rare animals is challenging. We report on the status of the two largest remaining populations of the Critically Endangered Bermuda skink Plestiodon longirostris, using a robust design capture–mark–recapture analysis. Skinks were tagged with passive integrated transponders on two islands and captured on 15 sampling occasions per year over 3 years. The models provided precise estimates of abundance, capture and survival probabilities and temporary emigration. We estimated skink abundance to be 547 ± SE 63.5 on Southampton Island and 277 ± SE 28.4 on Castle Island. The populations do not appear to be stable and fluctuated at both sites over the 3-year period. Although the populations on these two islands appear viable, the Bermuda skink faces population fluctuations and remains threatened by increasing anthropogenic activities, invasive species and habitat loss. We recommend these two populations for continued monitoring and conservation efforts.