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Prolonged abnormal vomiting causes metabolic alkalosis. Many seabirds are known to feed their chicks by regurgitation. We hypothesized that metabolic alkalosis occurs in seabirds even under natural conditions during the breeding season. Adélie penguins Pygoscelis adeliae feed their chicks by regurgitating food for 50-60 d until the chicks fledge. In this study, the concentrations of Cl-, HCO3-, Na+, K+, pH, and in the blood of breeding Adélie penguins were measured throughout the chick-rearing season. The pH of penguin venous blood shifted from 7.54 in the guarding period to 7.47 in the crèche period. Decreasing Cl- and increasing HCO3- blood concentrations in parents were associated with increasing mass of their brood in the guarding period, the early phase of the rearing season, indicating that regurgitating to feed chicks causes loss of gastric acid and results in relative metabolic alkalosis. The inverse trend was observed during the crèche period, the latter phase of the rearing season, when parents spent more time at sea and have fewer opportunities for gastric acid loss. This was assumed to be the recovery phase. These results indicate that regurgitation might cause metabolic alkalosis in breeding Adélie penguins. To our knowledge, this is the first report to indicate that seabirds exhibit metabolic alkalosis due to regurgitation to feed chicks under natural conditions.

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Hokkaido University Collection of Scholarly and Academic Papers  


Sakamoto, Kentaro Q. -  Sato, Katsufumi -  Kato, Akiko -  Fukui, Daisuke -  Bando, Gen -  Naito, Yasuhiko -  Habara, Yoshiaki -  Ishizuka, Mayumi -  Fujita, Shoichi - 

Id.: 69969184

Idioma: inglés  - 

Versión: 1.0

Estado: Final

Palabras clave488 - 

Tipo de recurso: article  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: Distributed under licence by JSTOR.

Requerimientos técnicos:  Browser: Any - 

Fecha de contribución: 06-oct-2017


* Physiological and Biochemical Zoology, 83(2): 232-238

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