Bias and Loss of Precision Due to Tag Loss in Jolly–Seber Estimates for Mark–Recapture Experiments

摘要: A crucial, though often ignored, assumption of mark–recapture experiments is that animals do not lose their marks (tags). We present results theoretical analyses the effects tag loss on estimates population size (), survival births or new entries and standard errors (SE()), for Jolly–Seber (full) model allowing birth death. show that, SE() are biased by loss, while , biased. similar analysis (death-only) where known to occur shows strongly only unbiased. Moreover, both models, causes a in precision all (i.e. an increase error estimate, leading wider confidence intervals). Throughout paper, we assume homogeneous among animals; is, it same marked regardless age, sex, tag-retention time, although rate per unit time may change o...