Buoyancy properties of the giant diatom Ethmodiscus

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Abstract
Net-collected Ethmodiscus spp. were examined and found to be capable of positive buoyancy with ascent rates averaging 1.4 m h−1 on individually measured cells, and 0.3 m h−1 using a homogeneous settling technique. These data, together with published reports of positive buoyancy in Rhizosolenia, indicate that upward movement is a widespread phenomenon in large oceanic diatoms. These observations also suggest that published size-rate relationships for marine diatoms require revision to include the effects of positive buoyancy.

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