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Measurement error in a burrow index to monitor relative population size in the common vole

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    0084920 - ÚBO 2008 RIV CZ eng J - Journal Article
    Lisická, L. - Losík, J. - Zejda, Jan - Heroldová, Marta - Nesvadbová, Jiřina - Tkadlec, Emil
    Measurement error in a burrow index to monitor relative population size in the common vole.
    [Chyba měření norového indexu pro monitorování relativní velikosti populace u hraboše polního.]
    Folia zoologica. Roč. 56, č. 2 (2007), s. 169-176. ISSN 0139-7893. E-ISSN 1573-1189
    R&D Projects: GA ČR GA206/04/2003
    Institutional research plan: CEZ:AV0Z60930519
    Keywords : bias * colonisation * dispersion * Microtus arvalis * precision * sampling error
    Subject RIV: EH - Ecology, Behaviour
    Impact factor: 0.376, year: 2007
    http://www.ivb.cz/folia/56/2/169-176_MS1293.pdf

    By examining the indices to monitor population size in the common vole, we found that relative sampling errors were enormous for low-density populations, attaining almost 400%. However, in high-density populations and for large sample sizes, the relative error dropped below 10% and the estimate is quite reliable. The dispersion of burrow entrances became more clumped at low population densities enhancing further the sampling variation. We demonstrated that the index is related to population size in a non-linear fashion, overestimating the population change at high densities. Consequently, population dynamics of the common vole described by the untransformed burrow index appear more variable than they are in reality.

    Prošetřili jsme vzorkovací a systematickou chybu měření u indexu počet znovuotevřených nor na ha u hraboše polního. Zjistili jsme, že vzorkovací je extrémně velká při malých početnostech, systematická chyba je naopak velka při vyšších denzitách.
    Permanent Link: http://hdl.handle.net/11104/0147542

     
     
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