About this Earth and Planetary Sciences article
Mechanisms Of Fluid Shear‐induced Inhibition Of Population Growth In A Red‐tide Dinoflagellate^1^ by Andrew R. Juhl; Michael I. Latz is a Earth and Planetary Sciences article available to read on EtoBox.
Net population growth of some dinoflagellates is inhibited by fluid shear at shear stresses comparable with those generated during oceanic turbulence. Decreased net growth may occur through lowered cell division, increased mortality, or both. The dominant mechanism under various flow conditions was determined for the red‐tide dinoflagellate __Lingulodinium polyedrum__ (Stein) Dodge. Cell division and mortality were determined by direct observation of isolated cells in 0.5‐mL cultures that were shaken to generate unquantified fluid shear. Larger volume cultures were exposed to quantified laminar shear in Couette‐flow chambers (0.004–0.019 N·m**^−^**^2^ shear stress) and to unquantified flow in shaken flasks. In these larger cultures, cell division frequency was calculated from flow cytometric measurements of DNA·cell^−1^. The mechanism by which shear inhibits net growth of __L. polyedrum__ depends on shear stress level and growth conditions. Observations on the isolated cells showed that shaking inhibited growth by lowering cell division without increased mortality. Similar results were found for early exponential‐phase cultures exposed to the lowest experimental shear stress in Cou
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- Author
- Andrew R. Juhl; Michael I. Latz
- Publisher
- John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0022-3646)
- Published
- 2002
- Language
- EN
- Field
- Earth and Planetary Sciences (Physical Sciences)