Buoyancy properties of the giant diatom Ethmodiscus |
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Authors: | Villareal Tracy A |
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Institution: | Marine Sciences Research Center, State University of New York Stony Brook, NY 11794-5000, USA
Present address: Environmental Sciences Program, University of Massachusetts, Boston Harbor Campus Boston, MA 02125-3393, USA |
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Abstract: | Net-collected Ethmodiscus spp. were examined and found to becapable of positive buoyancy with ascent rates averaging 1.4m h1 on individually measured cells, and 0.3 m h1using a homogeneous settling technique. These data, togetherwith published reports of positive buoyancy in Rhizosolenia,indicate that upward movement is a widespread phenomenon inlarge oceanic diatoms. These observations also suggest thatpublished size-rate relationships for marine diatoms requirerevision to include the effects of positive buoyancy. |
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