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Kāpēc zivis ir aukstasiņu dzīvnieki?
8, 2007, 19:14Ingrīda
:-:

    Ūdenim piemīt ļoti liela siltumietilpība. Neba velti automašīnās izmato ūdens radiatorus, kas strāda daudz efektigāk kā gaisa dzesēšana. Zivis pastāvīgi dzīvo tādā „dzesētājā” un tad nu jāizvēlas, vai sgalabāt ķermeņa temperatūra, kas ievērojami atšķiras no vides un prasa dažadus pielāgojumus (biezs tauku slānis utt.), vai arī nolīdzināt ķermeņa temperatūru ar apkārtējo vidi. Zivju attīstība ir izvēlējusies otro ceļu. Tiesa, ūdenī dzīvojošiem aukstasiņu dzīvniekiem klājas daudz vieglāk, kā uz sauszemes mītošiem, jo ūdens ar savu lielo siltumietilpību arī nodrošinu daudz stabilāku vides temperatūru kā gaiss. Ūdeni (ja tā nav peļķe vai sīks dīķis, kur ūdens kopmasa ir niecīga) nav tādas t° svārstības kā tas ir gaisa vidē.
    19, 2007, 11:38Zirneklītis
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