title: Spectral sensitivity of the barnacle, Balanus amphitrite.
abstract: The extracellular ocellar potential was used to evaluate the spectral sensitivity of the ocellus of the barnacle, Balanus amphitrite. Maximum relative sensitivity was at 530-540 nm. Studies with chromatic adapting lights suggest that the receptors contain a single photopigment. The spectra were relatively broader in the dark as compared to the light-adapted state. This effect was shown to be due to an increase in the slope of the amplitude-intensity function, caused by light adaptation. Studies of tapetal fluorescence and corneal transmission indicate little effect of the ocellar media on the determination of sensitivity.
mesh_terms: D000200:Action Potentials; D000221:Adaptation, Ocular; D000818:Animals; D003116:Color; D003445:Crustacea / Q000502:physiology*; D003623:Dark Adaptation; D004594:Electrophysiology; D005453:Fluorescence; D066298:In Vitro Techniques; D008027:Light; D009799:Ocular Physiological Phenomena; D010786:Photoreceptor Cells / Q000502:physiology; D010858:Pigmentation; D009435:Synaptic Transmission