TY - GEN N1 - pg(s) 145-151 N2 - Despite numerous studies on avian eggs, the function of eggshell patterning remains largely unknown. Using a museum collection of Red-backed Shrike clutches, we estimated the repeatability of characteristics describing the intensity and contrast of egg pigmentation, as well as egg size and shape. Digitalized photographs of eggs were used for all measurements. Repeatability was highest for overall pigmentation intensity and overall pigmentation contrast (R = 0.81 and R = 0.82 respectively). Lower values were recorded for egg breadth (R = 0.66) and shape (R = 0.57). These findings suggest that eggshell patterning, as well as the variables describing egg size and shape, may respond to natural selection. Among the possible functions of this trait, condition signalling within species and mimicry are the most probable. To obtain more evidence of this, however, further studies in wild populations are required. M3 - Text J2 - Barwa skorupki jaj u gąsiorka: związek z rozmiarami jaja i potencjalne funkcje PY - 2006 IS - 2 EP - 151 KW - digital image analysis KW - egg pigmentation KW - egg shape KW - egg size KW - lanius collurio KW - measurements KW - museum collection KW - repeatability A1 - Surmacki, Adrian A1 - Kuczyński, Lechosław A1 - Tryjanowski, Piotr A2 - Museum and Institute of Zoology, Polish Academy of Sciences PB - Museum and Institute of Zoology, Polish Academy of Sciences VL - 41 CY - Warsaw SP - 145 T1 - Eggshell patterning in the Red-backed Shrike Lanius collurio: relation to egg size and potential function UR - http://rcin.org.pl/miiz/dlibra/publication/edition/65689 ER -