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In strongly acidified lakes, the primary biological response might be a massive proliferation of thread-like algae. Amongst a lot of ecological ramifications, these algae might act as a diffraction grating for incident sunlight. The phenomenon is plainly visible in this underwater scene with diatomaceous algae and pads of hybrid Yellow Water lily (Nuphar lutea x pumila).Nikon 1AW1 + AW 10 mm f/2.8
Correct me if I am wrong, but that seem to be "nøkken" straight out of Kittilsen