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Dark Survival of the Surf Diatom Anaulus australis Drebes et Schulz

The surf diatom, Anaulus australis Drebes et Schulz, requires a mechanism to survive the prolonged dark conditions to which it is periodically exposed during calm conditions. This study examined various aspects of A. australis cells kept in the dark for a prolonged period. While many cells became distorted or damaged and were obviously no longer viable, the cytoplasm of some cells became dark and compact suggestive of a resting phase. The physiological activity (photosynthesis and respiration) of the population was reduced to zero within 20 days of darkness. After cells were kept in the dark for more than 2 months, some rapidly regained their full physiological potential (...)