Water economy is the equilibrium between the amount of water an organism takes in and the amount it loses to the outside world, and is a condition for maintaining water homeostasis within the organism. Losing water is a serious physiological threat to organisms, especially those that live on land, and it is essential for them to have the ability to defend against and compensate for loss of water due to dehydration. [animal] Although animals originally evolved from aquatic organisms, some vertebrates, arthropods, and mollusks acquired these abilities and became perfectly adapted to life on land (reptiles, birds, mammals, insects, spiders, scorpions, and land snails). Source: Heibonsha World Encyclopedia, 2nd Edition Information |
水分経済water economyともいう。生物が体内に取り込む水の量と外界に失う水の量との平衡関係のことで,生物体内の水分の恒常性を保つための条件である。生物が水を失うことは,とくに陸上生活をするものにとっては重大な生理的脅威であって,乾燥による失水にたいする防御・補償能力のあることが陸上生活にとっては不可欠である。 [動物] 動物はもともと水生のものから進化してきたが,脊椎動物,節足動物,軟体動物のなかから,このような能力を獲得して陸上生活に完全に適応したものが現れた(爬虫類,鳥類,哺乳類,昆虫類,クモ・サソリ類,陸生巻貝類)。 出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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