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kā hameleoni spēj mainīt krāsu???=)
14, 2006, 18:34karīna
:-:

    Savu krāsu, vairāk vai mazāk, māk mainīt visas hameleonu dzimtas (Chamaeleontidae) sugas. Viens no kļūdainiem pieņēmumiem ir, ka hameleoni maina krāsu pielāgojoties apkārtējās vides krāsām. Viņiem tas sanāk pats par sevi, bet ne tādēļ viņi maina krāsu. Patiesībā hameleonu krāsu ietekmē temperatūra, gaisma, kā arī paša dzīvnieciņa garastāvoklis un dvēseles noskaņojums. Mainoties viņa emocionālam stāvoklim, mainās arī dzīvnieciņa krāsa. Varētu būt, ka, pazeminoties apkārtējai temperatūrai, hameleoni kļūst tumšāki, lai labāk uztvertu saules siltumu. Iespējamā krāsu gamma ir atkarīga no hameleonu sugas. Daudzi no viņiem var kļūt dzelteni, zaļi, bāli vai tumši brūni, bieži ar tumšākiem vai gaišākiem plankumiem.

    Krāsu maiņu nodrošina krāsu pigmentu granulu izkliedēšana vai sakopošana pigmentu šūnās, ko nosaka autonoma nervu sistēmas darbība. Šis pigmentu šūnas ir izvietojošās hameleona ādā dažādā dziļumā. Visdziļāk ir tās šūnas, kuras satur tumši brūno pigmentu melanīnu. Šo šūnu izaugumi sasniedz arī ādas virspusi. Kad hameleons jūtas nomākts, melanīns tiek nosūtīts tuvāk ādas virspusei, tādējādi padarot hameleonu tumšāku. Citas šūnas, kas satur citus pigmentus, spēj sarauties un izplesties, tādējādi samazinot vai palielinot to redzamo virsmas laukumu, kas, skatoties kopumā, izpaužas kā krāsu maiņa.

    15, 2006, 12:15Zirneklītis
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