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Determination of the swimming trajectory and speed of chain-forming dinoflagellate Cochlodinium polykrikoides with digital holographic particle tracking velocimetry
Sohn, M.H.; Seo, K.W.; Choi, Y.S.; Lee, S.J.; Kang, Y.S.; Kang, Y.S. (2011). Determination of the swimming trajectory and speed of chain-forming dinoflagellate Cochlodinium polykrikoides with digital holographic particle tracking velocimetry. Mar. Biol. (Berl.) 158(3): 561-570. hdl.handle.net/10.1007/s00227-010-1581-7
In: Marine Biology. Springer: Heidelberg; Berlin. ISSN 0025-3162, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Sohn, M.H.
  • Seo, K.W.
  • Choi, Y.S.
  • Lee, S.J.
  • Kang, Y.S.
  • Kang, Y.S.

Abstract
    The marine dinoflagellate Cochlodinium polykrikoides is a harmful and highly motile algal species. To distinguish between the motility characteristics of solitary and chain-forming cells, the swimming trajectories and speeds of solitary cells and 2- to 8-cell chains of C. polykrikoides were measured using a digital holographic particle tracking velocimetry (PTV) technique. C. polykrikoides cells exhibited helical swimming trajectories similar to other dinoflagellate species. The swimming speed increased as the number of cells in the chain increased, from an average of 391 µm s-1 (solitary cells) to 856 µm s-1 (8-cell chain). The helix radius R and pitch P also increased as the number of cells in the chain increased. R increased from 9.24 µm (solitary cell) to 20.3 µm (8-cell chain) and P increased from 107 µm (solitary cell) to 164 µm (8-cell chain). The free thrust-generating motion of the transverse flagella and large drag reduction in the chain-forming cells seemed to increase the swimming speed compared to solitary cells. The measured swimming speeds agreed with those from field observations. The superior motility of chain-forming C. polykrikoides cells may be an important factor for its bloom, in addition to the factors reported previously.

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