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

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Title: Metabolic Alkalosis due to Feeding Chicks in Breeding Adélie Penguins Pygoscelis adeliae under Natural Conditions
Authors: Sakamoto, Kentaro Q. Browse this author →KAKEN DB
Sato, Katsufumi Browse this author
Kato, Akiko Browse this author
Fukui, Daisuke Browse this author
Bando, Gen Browse this author
Naito, Yasuhiko Browse this author
Habara, Yoshiaki Browse this author →KAKEN DB
Ishizuka, Mayumi Browse this author →KAKEN DB
Fujita, Shoichi Browse this author →KAKEN DB
Issue Date: Mar-2010
Publisher: University of Chicago Press
Journal Title: Physiological and Biochemical Zoology
Volume: 83
Issue: 2
Start Page: 232
End Page: 238
Publisher DOI: 10.1086/597517
PMID: 19302032
Abstract: 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.
Type: article
Appears in Collections:獣医学院・獣医学研究院 (Graduate School of Veterinary Medicine / Faculty of Veterinary Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 坂本 健太郎

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