Plasma and urine levels of electrolytes, urea and steroid hormones involved in osmoregulation of cetaceans
スポンサーリンク
概要
- 論文の詳細を見る
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.
- 社団法人日本動物学会の論文
- 2005-11-25
著者
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Urano Akihisa
Division Of Biological Sciences Graduate School Of Science Hokkaido University
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Ando Hironori
Division of Biological Sciences, Graduate School of Science, Hokkaido University
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Goto Mutsuo
Inst. Cetacean Res. Tokyo Jpn
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Pastene Luis
Inst. Cetacean Res. Tokyo Jpn
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Goto Mutsuo
The Institute of Cetacean Research
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Pastene Luis
The Institute of Cetacean Research
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Kanda Naohisa
The Institute of Cetacean Research
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Urano Akihisa
Laboratory Of Molecular Biology Ocean Research Institute University Of Tokyo
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Ando Hironori
Division Of Biological Sciences Graduate School Of Science Hokkaido University
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Birukawa Naoko
Division of Biological Sciences, Graduate school of Science, Hokkaido University
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Nakatsuji Hiroki
Field Science Center for Northern Biosphere, Hokkaido University
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Hata Hiroshi
Field Science Center for Northern Biosphere, Hokkaido University
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Ando Hironori
Division Of Biological Sciences Graduate Shool Of Science Hokkaido Univeristy
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Urano Akihisa
Division Of Biological Sciences Graduate Shool Of Science Hokkaido Univeristy
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Urano Akihisa
Field Science Center For Northern Biosphere Hokkaido University
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Birukawa Naoko
Division Of Biological Sciences Graduate School Of Science Hokkaido University
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Birukawa Naoko
Division Of Biological Science Graduate School Of Life Science Hokkaido University
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Urano Akihisa
Division Of Biological Science Graduate School Of Life Science Hokkaido University
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Hata Hiroshi
Field Science Center For Northern Biosphere Agro-ecosystem Research Station Shizunai Livestock Farm
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Hata Hiroshi
Field Science Center For Northern Biosphere Hokkaido University
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NAKATSUJI Hiroki
Graduate School of Agriculture, Hokkaido University
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Nakatsuji Hiroki
Graduate School Of Agriculture Hokkaido University
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Nakatsuji Hiroki
Field Science Center For Northern Biosphere Hokkaido University
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