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diel vertical migration occurs in species of foraminifera throughout the year in the polar regions; however, during the midnight sun, no differential light cues exist so they remain at the surface to feed upon the abundant phytoplankton, or to facilitate photosynthesis by their symbionts. This is not true for all species at all times, however. Zooplankton have been observed to resynchronize their migrations with the light of the moon during periods when the sun is not

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