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Spectral sensitivity of dark adapted eyes from aquatic and terrestrial animals of Triturus alpestris was determined using the ERG. Spectral sensitivity changes with transition in a different habitat during metamorphosis and in adult animals in a seasonal course. In aquatic animals (larvae and adults in spring) data agree with the absorption curve for porphyropsin P 523. In juvenile and adult terrestrial animals in autumn data fit the absorption curve for rhodopsin P 502. [ABSTRACT FROM AUTHOR]