Age-related variations in bill size of chinstrap penguins

Abstract:

Adult breeding Chinstrap Penguins (Pygoscelis antarctica) have larger bills than one year old individuals, whereas the flipper length does not differ. Therefore, bill size increases with age during the juvenile stage. The allometric relationships of both bill length and bill depth with flipper length do not differ between age groups. The relation of bill length with bill depth does not differ between adults and juveniles, suggesting no change in bill shape with age. If the random samples of adults and yearlings represent a similar proportion of males and females, these results do not support sex divergence in bill growth after the first year of life. /// Este trabajo muestra que los adultos reproductores de Pingüino Barbijo (Pygoscelis antarctica) tienen picos mayores que los individuos de un año de edad, mientras que la longitud de la aleta no difiere. Por lo tanto, el tamaño del pico se incrementa con la edad durante el …

Año de publicación:

1998

Keywords:

Fuente:

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