Počet záznamů: 1

A sum of its individual parts? Relative contributions of different eggshell regions to intraclutch variation in birds

  1. 1.
    0364252 - UBO-W 2012 RIV DK eng J - Článek v odborném periodiku
    Polačiková, L. - Hauber, M. E. - Procházka, Petr - Cassey, P. - Honza, Marcel - Grim, T.
    A sum of its individual parts? Relative contributions of different eggshell regions to intraclutch variation in birds.
    Journal of avian biology. Roč. 42, č. 4 (2011), s. 370-373 ISSN 0908-8857
    Grant CEP: GA ČR(CZ) GD524/05/H536; GA AV ČR IAA600930605; GA MŠk LC06073
    Výzkumný záměr: CEZ:AV0Z60930519
    Klíčová slova: blunt egg pole * Great reed warblers * parasitic eggs * discrimination
    Kód oboru RIV: EG - Zoologie
    Impakt faktor: 2.280, rok: 2011

    Egg rejection in several species of hosts is based on cues only at the blunt pole and not at the sharp pole of the foreign and own eggshell. We investigated whether intraclutch variation is confined to a specific egg pole in species where the extent of intraclutch variation in the overall egg appearance is known to positively covary with either egg rejection rate or the probability of being parasitized. Pooling measurements of brightness across the whole egg surface led to statistically non-significant results and masked positive correlations of blunt pole brightness with egg rejection or parasitism risk, respectively. In contrast, patterns of blue chroma were important across the whole egg. We advocate the use of a combination of region-specific and whole-eggshell based colour metrics and manipulations in cognitive, perceptual, and ecological studies of foreign egg rejection.
    Trvalý link: http://hdl.handle.net/11104/0199779