The detection of Rhizosolenia (Bacillariophyceae) in sediment of Ontario lakes and implications for paleoecology |
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| Authors: | Y -K Yung K H Nicholls A G Cheng |
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| Institution: | (1) Department of Botany, University of Toronto, M5S 1A1 Toronto, Ontario, Canada;(2) Institute for Environmental Studies, University of Toronto, M5S 1A1 Toronto, Ontario, Canada;(3) Aquatic Biology Section, Water Resources Branch, Ontario Ministry of the Environment, P.O. Box 213, M9W 5L1 Rexdale, Ontario, Canada |
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| Abstract: | The detection of the freshwater genus Rhizosolenia (Bacillariophyceae) remains in sediments is affected by the oxidants used in the digestion procedures. The Rhizosolenia counts decrease from 30% H2O2>50% HNO3>50% chromic acid>100% HNO3>100% H2SO4. Rhizosolenia is mostly found in Ontario lakes with summer average pH ranging from 5.6 to 8.3, Gran alkalinity from 0.2 to 120 mg L–1 as CaCO3 and water colour from 4 to 105 Hazen units. Large Rhizosolenia populations are generally found in clear lakes, neutral pH and low alkalinity. |
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| Keywords: | Rhizosolenia paleoecology diatoms acidification |
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