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    Population Estimation and Trappability of the European Badger (Meles meles): Implications for Tuberculosis Management.

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    Author
    Byrne, Andrew W.
    O'Keeffe, James
    green, stuart cc
    Sleeman, D. Paddy
    Corner, Leigh A. L.
    Gormley, Eamonn
    Murphy, Denise
    Martin, S. Wayne
    Davenport, John
    Keyword
    Mark-recapture data
    European Badger (Meles meles)
    Trappability
    Population estimation
    Wildlife vaccination
    Date
    05/11/2012
    
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    URI
    http://hdl.handle.net/11019/386
    Citation
    Byrne AW, O’Keeffe J, Green S, Sleeman DP, Corner LAL, et al. (2012) Population Estimation and Trappability of the European Badger (Meles meles): Implications for Tuberculosis Management. PLoS ONE 7(12): e50807. doi:10.1371/journal.pone.0050807
    Abstract
    Estimates of population size and trappability inform vaccine efficacy modelling and are required for adaptive management during prolonged wildlife vaccination campaigns. We present an analysis of mark-recapture data from a badger vaccine (Bacille Calmette–Gue´ rin) study in Ireland. This study is the largest scale (755 km2) mark-recapture study ever undertaken with this species. The study area was divided into three approximately equal–sized zones, each with similar survey and capture effort. A mean badger population size of 671 (SD: 76) was estimated using a closed-subpopulation model (CSpM) based on data from capturing sessions of the entire area and was consistent with a separate multiplicative model. Minimum number alive estimates calculated from the same data were on average 49–51% smaller than the CSpM estimates, but these are considered severely negatively biased when trappability is low. Population densities derived from the CSpM estimates were 0.82–1.06 badgers km22, and broadly consistent with previous reports for an adjacent area. Mean trappability was estimated to be 34–35% per session across the population. By the fifth capture session, 79% of the adult badgers caught had been marked previously. Multivariable modelling suggested significant differences in badger trappability depending on zone, season and age-class. There were more putatively trap-wary badgers identified in the population than trap-happy badgers, but wariness was not related to individual’s sex, zone or season of capture. Live-trapping efficacy can vary significantly amongst sites, seasons, age, or personality, hence monitoring of trappability is recommended as part of an adaptive management regime during large–scale wildlife vaccination programs to counter biases and to improve efficiencies.
    Funder
    Department of Agriculture, Food and the Marine, Ireland; Teagasc Walsh Fellowship Programme
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1371/journal.pone.0050807
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