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A Possible Varving Mechanism for Meromictic Lakes

Published online by Cambridge University Press:  20 January 2017

M. D. Dickman
M. D. Dickman*
Affiliation:
Department of Biological Sciences, Brock University, St. Catharines, Ontario, Canada, L2S 3A1
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Abstract

A variety of mechanisms have been proposed to explain how light and dark couplets are formed in the profundal sediments of meromictic lakes but none of these explanations acknowledges the significance of the sudden and massive mortality of mixolimnetic anaerobic bacteria. Data collected from sedimentation chambers suspended below the chemocline in a small meromictic lake indicate that a massive mortality of photosynthetic bacteria was induced by a sudden intrusion of partially oxygenated water into the anaerobic lower mixolimnion. The resulting deposition of anaerobic bacteria (0.45 mg dry wt cm−2 day−1) contributed 60% of the annual sediment influx during a 14-day period. It is postulated that the sudden sedimentation of the anaerobic bacteria inhabiting the lower mixolimnion of some meromictic lakes contributed to the formation of the dark-colored laminae in the sediments of these lakes.

Type
Original Articles
Information
Quaternary Research , Volume 11 , Issue 1 , January 1979 , pp. 113 - 124
Copyright
University of Washington

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