1. UNUSUAL MOTILITY OF TUBE-DWELLING PENNATE DIATOMS.
- Author
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Williams, Richard B.
- Subjects
- *
PENNALES , *DIATOMS , *SALT marshes , *CELLS , *NAVICULA - Abstract
Several species of tube-dwelling, pennate diatoms present in salt marshes adjoining Sapelo Island, Georgia, possessed previously undescribed types of motility. The tubes penetrated into the sediment, permitting the diatoms to retreat from the sediment surface in response to stimuli. Cells of Nitzschia obtusa withdrew down their tubes at 120 to 240 μ / sec. Colonies of Frustulia asymmetrica withdrew at 44 to 500 μ/ sec, with the cells remaining motionless relative to the tube. Tubes containing colonies of Gyrosigma scalproides var. eximia and a Navicula sp. moved slowly into or out of the sediment. [ABSTRACT FROM AUTHOR]
- Published
- 1965
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