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JOURNAL OF PLANKTON RESEARCH | VOLUME 14 | NUMBER 3 | PAGES 459-463 | 1992
© Oxford University Press

other

Buoyancy properties of the giant diatom Ethmodiscus

Tracy A. Villareal

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

Received on November 15, 1990; accepted on August 22, 1991 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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