| Summary: | Pages 557-581 : illustrations 24 cm Bibliographical references (pages 579-581) Abstract in Polish The growth rate of the nestlings of the little auk is the highest among Alcidae (K = 0.256, t10-90 = 17.2 days). The peak weight represents 77.3%, and the fledging weight 67.3% of the weight of adult birds. The high growth rate, short nesting period and relatively small body size at fledging are the expression of an evolutional tendency of the nestlings of the little auk to precocity which is a form of adaptation of the species to reproduction in high-arctic conditions. The prefledging body-weight fall improves the locomotory capability and physiological efficiency of juvenile birds leaving a breeding colony. Egg size, related to the body size of parent birds, has a significant influence on the growth and development of the nestlings. In the period that precedes the leaving of the nest a tendency is seen towards a uniform body size of the nestlings through changes in the length of the nesting period, and the magnitude of the prefledging body-weight decrease. Strony 557-581 : ilustracje 24 cm Bibliografia na stronach 579-581 Streszczenie w języku polskim The growth rate of the nestlings of the little auk is the highest among Alcidae (K = 0.256, t10-90 = 17.2 days). The peak weight represents 77.3%, and the fledging weight 67.3% of the weight of adult birds. The high growth rate, short nesting period and relatively small body size at fledging are the expression of an evolutional tendency of the nestlings of the little auk to precocity which is a form of adaptation of the species to reproduction in high-arctic conditions. The prefledging body-weight fall improves the locomotory capability and physiological efficiency of juvenile birds leaving a breeding colony. Egg size, related to the body size of parent birds, has a significant influence on the growth and development of the nestlings. In the period that precedes the leaving of the nest a tendency is seen towards a uniform body size of the nestlings ...
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