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Buoyancy Limitation of Filamentous Cyanobacteria under Prolonged Pressure due to the Gas Vesicles Collapse

Author

Listed:
  • Helayaye Damitha Lakmali Abeynayaka

    (Saitama University, Department of Environmental Science and Technology)

  • Takashi Asaeda

    (Saitama University, Department of Environmental Science and Technology)

  • Yasuko Kaneko

    (Saitama University, Graduate School of Science and Engineering)

Abstract

Freshwater cyanobacterium Pseudanabaena galeata were cultured in chambers under artificially generated pressures, which correspond to the hydrostatic pressures at deep water. Variations occurred in gas vesicles volume, and buoyancy state of cells under those conditions were analyzed at different time intervals (5 min, 1 day, and 5 days). Variations in gas vesicles morphology of cells were observed by transmission electron microscopy images. Settling velocity (Vs) of cells which governs the buoyancy was observed with the aid of a modified optical microscope. Moreover, effects of the prolonged pressure on cell ballast composition (protein and polysaccharides) were examined. Elevated pressure conditions reduced the cell ballast and caused a complete disappearance of gas vesicles in Pseudanabaena galeata cells. Hence cyanobacteria cells were not able to float within the study period. Observations and findings of the study indicate the potential application of hydrostatic pressure, which naturally occurred in hypolimnion of lakes, to inhibit the re-suspension of cyanobacteria cells.

Suggested Citation

  • Helayaye Damitha Lakmali Abeynayaka & Takashi Asaeda & Yasuko Kaneko, 2017. "Buoyancy Limitation of Filamentous Cyanobacteria under Prolonged Pressure due to the Gas Vesicles Collapse," Environmental Management, Springer, vol. 60(2), pages 293-303, August.
    • Handle: RePEc:spr:envman:v:60:y:2017:i:2:d:10.1007_s00267-017-0875-7
    DOI: 10.1007/s00267-017-0875-7
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