Woodpeckers, decay, and the future of cavity-nesting vertebrate communities worldwide

Authors

  • Kristina L Cockle,

    Corresponding author
    1. Center for Applied Conservation Research, Faculty of Forestry, University of British Columbia, Vancouver, British Columbia, Canada
    2. Proyecto Selva de Pino Paraná, Fundación de Historia Natural Félix de Azara, Departamento de Ciencias Naturales y Antropología, Universidad Maimónides, Buenos Aires, Argentina
    3. CICyTTP-CONICET, Diamante, Entre Ríos, Argentina
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  • Kathy Martin,

    1. Center for Applied Conservation Research, Faculty of Forestry, University of British Columbia, Vancouver, British Columbia, Canada
    2. Environment Canada, Delta, British Columbia, Canada
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  • Tomasz Wesołowski

    1. Department of Avian Ecology, Wrocław University, Wrocław, Poland
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Abstract

In forests worldwide, tree-cavity supply can limit populations of the 10–40% of bird and mammal species that require cavities for nesting or roosting. Conservation efforts aimed at cavity-using communities have often focused on woodpeckers because, as cavity excavators, they are presumed to control cavity supply. We show that avian excavators are the primary cavity producers in North America (77% of nesting cavities), but not elsewhere (26% in Eurasia and South America; 0% in Australasia). We studied survivorship of 2805 nest cavities and found similar persistence of cavities created by woodpeckers and those created by decay in Canada, but low persistence of woodpecker-excavated cavities in Poland and Argentina. Outside of North America, the ephemeral nature of many woodpecker cavities may render most cavity-using vertebrates critically dependent on the slow formation of cavities by damage and decay. The future of most cavity-using communities will therefore be highly dependent on changing forest policies to stem the current loss of old trees.

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