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Photomovement measurements were carried out with swarmers of the brown algae Scytosiphon lomentaria (Lyngb.) Link and Petalonia fascia (O. F. Mull.) as a function of irradiance direction, photon irradiance, spectral composition and ultraviolet radiation (UVR, λ=280-400 nm) dose. Swarmers from both species showed similar photomovement patterns: negative phototaxis occurred under photon irradiances...
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