Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Diatom locomotion: variations in methods of locomotion and colonial coupling in bacillaria paradoxa
Student Author(s): Grove, Douglas
Faculty Advisor(s): Gilly, William
%E Baxter, Chuck
%E Denny, Mark
Pages: 49
Location: Final Papers Biology 175H
Date: June 1984
Keywords: movement
Abstract: Locomotion was studied in seven species of marine diatomes. A scanning electron microscope was employed to observe frustule morphology, secretion from the raphe system, and trails. Active secretion may be involved in locomotion, but to varying degrees in each species of diatom. It is also possible that secreted trails are, for the most part, just a by-product of locomotion in certain species. Differences in sensitivity to the content of calcium of sea water may indicate less direct use of secretion for locomotion in Nitzschia Longissima and Bacillaria Paradoxa. In addition, drugs such as cytochalasin D and movement in sea water flow seems to confirm the fact that microtubules are not involved and that at least Navicula Vulpina and Nitzschia Closterium use only their posterior portions of their raphe systems during locomotion. Wing like extensions of the frustule used in coupling colonial Bacillaria paradoxa were observed for the first time.