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Plasma and urine levels of electrolytes, urea and steroid hormones involved in osmoregulation of cetaceans

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タイトル: Plasma and urine levels of electrolytes, urea and steroid hormones involved in osmoregulation of cetaceans
著者: Birukawa, Naoko 著作を一覧する
Ando, Hironori 著作を一覧する
Goto, Mutsuo 著作を一覧する
Kanda, Naohisa 著作を一覧する
Pastene, Luis A. 著作を一覧する
Nakatsuji, Hiroki 著作を一覧する
Hata, Hiroshi 著作を一覧する
Urano, Akihisa 著作を一覧する
キーワード: osmolality
steroid hormones
発行日: 2005年11月
出版者: Zoological Society of Japan
誌名: Zoological Science
巻: 22
号: 11
開始ページ: 1245
終了ページ: 1257
出版社 DOI: 10.2108/zsj.22.1245
抄録: Cetaceans are well adapted to their hyperosmotic environment by properly developed osmoregulatory ability. A question here is how they regulate water and mineral balances in marine habitats. In the present study, we determined blood and urine levels of various chemicals involved in osmoregulation, compared them with those in artiodactyls, and characterized the values in the whales. Blood and urine samples obtained from baleen whales of common minke (Balaenoptera acutorostrata), sei (B. borealis), and Bryde's whales (B. brydei), and toothed whales of sperm whales (Physeter macrocephalus) were analyzed for osmolality, major electrolytes, urea, steroid hormones and glucose. The urine osmolality and Na+ concentrations in the cetaceans were much higher than those in the cattle. Furthermore, the cetaceans had 5 to 11-fold urea in plasma than the cattle, and 2 to 4-fold urea in urine. There were no significant difference in the plasma concentrations of corticosteroids between the cetaceans and the cattle. The present results indicate that the osmoregulatory parameters seem to be not affected by the reproductive stage and sex steroid hormones. The concentrations of urea in plasma and urine of the baleen whales were higher than those of the sperm whales, indicating a possibility that their osmoregulatory mechanisms may be correlated to their feeding habits. The present results suggest that cetaceans have unique osmoregulatory mechanisms by which they excrete strongly hypertonic urine to maintain fluid homeostasis in marine habitats.
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 浦野 明央


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