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Journal of Plankton Research Vol.22 no.8 pp.1579-1589, 2000
© Oxford University Press 2000

Heterogeneity of cyanobacterial gas-vesicle volume and metabolic activity

Justin D. Brookes1,3, George G. Ganf1 and Roderick L. Oliver2

1 Department of Environmental Biology, The University of Adelaide, Adelaide, South Australia, 5005 and 2 CRC for Freshwater Ecology, Murray Darling Freshwater Research Centre, PO Box 921, Albury, NSW, 2640, Australia

3 Present address: CRC for Water Quality and Treatment, PMB 3, Salisbury, South Australia, 5108, Australia

The literature suggests that relative gas-vesicle volume and metabolic activity differ between individuals within natural populations of cyanobacteria. We demonstrate, using flow cytometry and fluorescein diacetate (FDA) conversion rates, that individual relative gas-vesicle volumes differed by 6.7- and 4.6-fold, and individual cell photosynthetic rates ranged from 0.026 to 0.127 and from 0.075 to 2.415 fmol O2 cell–1 min–1 within phosphorus-starved and phosphorus-replete Microcystis aeruginosa populations, respectively. The observation that there is considerable heterogeneity in gas-vesicle volume and cell metabolic activity in cultured populations suggests that this could also contribute to heterogeneity in buoyancy of field populations.


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J. D. Brookes and G. G. Ganf
Variations in the buoyancy response of Microcystis aeruginosa to nitrogen, phosphorus and light
J. Plankton Res., December 1, 2001; 23(12): 1399 - 1411.
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