Evaluation of the performance and accuracy of Global Positioning System bug transmitters deployed on a small mammal

Glasby, Lee; Yarnell, Richard W.

doi:10.1007/s10344-013-0770-3

Cited by 20 publications

(22 citation statements)

References 18 publications

(19 reference statements)

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“…Radio-tracking took place using a Sika radio tracking receiver fitted with a flexible Yagi three-pronged antenna (Biotrack). Hedgehogs were also individually marked with coloured heat shrink tubing to aid identification and weighed prior to release using an electronic balance (Glasby and Yarnell 2013). Rehabilitated hedgehogs were located via radio-tracking once per day for 3 days after release.…”

Section: Radio Trackingmentioning

confidence: 99%

Should rehabilitated hedgehogs be released in winter? A comparison of survival, nest use and weight change in wild and rescued animals

et al. 2019

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The rehabilitation of sick or injured wildlife and their subsequent release back into the wild is considered important, not only for the welfare of the individual animal but also for the conservation and management of endangered and threatened wildlife. The European hedgehog Erinaceus europaeus has declined by 25% in Britain over the last decade and is the most common mammal admitted to wildlife rehabilitation centres in Britain, with a large proportion of individuals admitted to gain body weight overwinter prior to release in the spring. Consequently, many thousands of hedgehogs are housed overwinter which incurs significant costs for rehabilitation centres, and has potentially animal welfare issues, such as, stress in captivity, reintroduction stress, increased mortality risk and impaired or altered behaviour. To determine if releasing rehabilitated hedgehogs during autumn and winter had an effect on their survival, body weight or nesting behaviour, we compared these factors between 34 rehabilitated hedgehogs with 23 wild hedgehogs across five sites in England over four different winters. Overwinter survival was high for both wild and rehabilitated hedgehogs, with a significant decrease in survival across both groups when hedgehogs became active post hibernation in spring. We found no differences in the survival rates up to 150 days post release, in weight change, or nest use between wild-and winter-released rehabilitated hedgehogs. Our results suggest that under the correct conditions, rehabilitated hedgehogs can be released successfully during winter, therefore avoiding or reducing time in captivity.

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Section: Radio Trackingmentioning

confidence: 99%

Should rehabilitated hedgehogs be released in winter? A comparison of survival, nest use and weight change in wild and rescued animals

et al. 2019

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“…Therefore, future studies will require other field methods, such as radio-or GPS-tracking (e.g. Glasby and Yarnell 2013), to identify characteristics associated with the differential use of individual gardens.…”

Section: Factors Affecting the Use Of Gardens By Hedgehogsmentioning

confidence: 99%

A prickly problem: developing a volunteer-friendly tool for monitoring populations of a terrestrial urban mammal, the West European hedgehog (Erinaceus europaeus)

et al. 2018

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Across Europe, hedgehogs (Erinaceus europaeus) appear to be in decline in both urban and rural landscapes. Current methods used to monitor urban populations are, however, associated with several potential limitations. In this study, we conducted hedgehog footprint-tunnel surveys in 219 residential gardens across Reading, UK between May-September in 2013 and/or 2014; gardens were surveyed for five continuous days. Single-species occupancy models were used to investigate factors influencing hedgehog occupancy and two-species occupancy models were used to estimate a species interaction factor (SIF) between hedgehogs and (a) badgers (Meles meles), (b) foxes (Vulpes vulpes) and (c) dogs (Canis familiaris). The five-day survey protocol was associated with a falseabsence error rate of 0.1-0.4%, indicating that it was a reliable method for determining hedgehog presence; conversely, 34.7% of householders were not able to correctly predict hedgehog presence or absence. Hedgehogs were widely distributed across Reading, but detected in only 32-40% of gardens. None of the within-garden or outside-garden factors investigated significantly affected hedgehog occupancy in the single-species models, but the two-species models indicated that badgers (SIF = 0.471 ± 0.188), but not foxes (SIF = 0.954 ± 0.048) or dogs (SIF = 0.780 ± 0.228), negatively affected the presence of hedgehogs in gardens, although not significantly. Overall, footprint-tunnels represent a viable field method for monitoring urban hedgehog populations, however, other approaches are required to identify factors that make gardens Bhedgehog friendly^.

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“…GPS-telemetry based relocations provide more robust spatio-temporal datasets than conventional radio-telemetry and allow determination of fine-scale movement and associations with habitat features (Borger et al 2006a;Knight et al 2009;van Beest et al 2011). However, high frequency GPS-telemetry data suffer from serial autocorrelation and violate the assumption that each successive observation is independent of the previous observation Glasby and Yarnell 2013). Methods such as dynamic Brownian Bridge Movement Model (dBBMM) overcome issues associated with serial autocorrelation and variation in sampling intensity issues (Horne et al 2007;Kranstauber et al 2012) and provide a probabilistic estimate the animal's movement path, with the capability of D r a f t 5 highlighting both movement corridors and stopover sites.…”

Section: Fine-and Coarse-scale Movements and Habitat Use By Wood Turtmentioning

confidence: 99%

Fine- and coarse-scale movements and habitat use by Wood Turtles (Glyptemys insculpta) based on probabilistic modeling of radiotelemetry and GPS-telemetry data

et al. 2018

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Understanding animal movement and habitat use is critical for the delineation of habitat requiring protection for species at risk. Defining critical habitat requires studies with observations at a fine enough scale to reflect how animals use and move among habitats and include enough individuals to generalize findings to the population. We present results of a multiyear study on 48 adult Wood Turtles (Glyptemys insculpta (Le Conte, 1830)) from two different populations monitored with low-frequency radiotelemetry and high-frequency GPS telemetry. Results demonstrated the propensity for conventional radiotelemetry to underestimate cumulative distances moved and overestimate the amount of habitat used by Wood Turtles. Together the two data sets demonstrate the propensity for Wood Turtles to remain in close proximity to the river and that some differences in habitat use occur between the sexes; males tended to move parallel to the river, whereas females moved perpendicular to the river. The GPS-telemetry data provided a robust spatiotemporal data set that provided a better understanding of frequently used habitat types and features. Overall, study results suggest that currently delineated areas of protected habitat are likely to be effective in conserving these two populations and provides significantly improved, spatially explicit knowledge that can be used to inform further mitigation efforts if necessary.

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Evaluation of the performance and accuracy of Global Positioning System bug transmitters deployed on a small mammal

Cited by 20 publications

References 18 publications

Should rehabilitated hedgehogs be released in winter? A comparison of survival, nest use and weight change in wild and rescued animals

Should rehabilitated hedgehogs be released in winter? A comparison of survival, nest use and weight change in wild and rescued animals

A prickly problem: developing a volunteer-friendly tool for monitoring populations of a terrestrial urban mammal, the West European hedgehog (Erinaceus europaeus)

Fine- and coarse-scale movements and habitat use by Wood Turtles (Glyptemys insculpta) based on probabilistic modeling of radiotelemetry and GPS-telemetry data

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