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Metabolic Alkalosis due to Feeding Chicks in Breeding Adélie Penguins Pygoscelis adeliae under Natural Conditions

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タイトル: Metabolic Alkalosis due to Feeding Chicks in Breeding Adélie Penguins Pygoscelis adeliae under Natural Conditions
著者: Sakamoto, Kentaro Q. 著作を一覧する
Sato, Katsufumi 著作を一覧する
Kato, Akiko 著作を一覧する
Fukui, Daisuke 著作を一覧する
Bando, Gen 著作を一覧する
Naito, Yasuhiko 著作を一覧する
Habara, Yoshiaki 著作を一覧する
Ishizuka, Mayumi 著作を一覧する
Fujita, Shoichi 著作を一覧する
発行日: 2010年 3月
出版者: University of Chicago Press
誌名: Physiological and Biochemical Zoology
巻: 83
号: 2
開始ページ: 232
終了ページ: 238
出版社 DOI: 10.1086/597517
抄録: 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.
Rights: Distributed under licence by JSTOR.
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 坂本 健太郎


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