Počet záznamů: 1

Geographic variation in avian clutch size and nest predation risk along a productivity gradient in South Africa

  1. 1.
    0369550 - UBO-W 2012 RIV ZA eng J - Článek v odborném periodiku
    Hořák, D. - Sedláček, O. - Tószögyová, A. - Albrecht, Tomáš - Ferenc, M. - Jelínek, V. - Storch, D.
    Geographic variation in avian clutch size and nest predation risk along a productivity gradient in South Africa.
    Ostrich. Roč. 82, č. 3 (2011), s. 175-183 ISSN 0030-6525
    Grant CEP: GA ČR(CZ) GAP505/11/1617; GA MŠk LC06073
    Výzkumný záměr: CEZ:AV0Z60930519
    Klíčová slova: home-range size * Passerine birds * hypothesis * edge * community * forest * sites
    Kód oboru RIV: EG - Zoologie
    Impakt faktor: 0.427, rok: 2011

    Geographic variation in avian clutch size is thought to be related to the variation in nest predation rate and food availability. We studied predation on artificial ground nests along a large-scale geographic gradient in South Africa, and calculated mean clutch sizes of birds occurring in atlas quadrates surrounding our study sites. Clutch sizes generally increased with increasing productivity and seasonality. The least productive desert site was characterised also by the highest predation rate, whereas all the other sites located in savannas revealed much lower and more or less constant predation rate. We found no evidence for relationship between nest predation rates and clutch sizes of ground-nesting birds. This indicates that food availability is the major factor responsible for geographical variation in bird clutch sizes across South Africa, though high predation rate might also contribute to low clutch size in least productive arid environments.
    Trvalý link: http://hdl.handle.net/11104/0203585