Author(s): K. D. White; C. M. Reynolds; D. B. Ringelberg; K. L. Foley; L. B. Perry
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Abstract: High temporal-resolution monitoring of water quality parameters, accompanied by periodic microbial sampling, was carried out for an intermittently ice-covered river in Vermont during two winter seasons. The field data showed that dissolved oxygen (DO) patterns appear to be related to photosynthetically active radiation (PAR) in a manner that suggests that photosynthetic activity may be contributing to reaeration. Although the presence of algal-bacterial assemblages (or biofilms) have been reported within Arctic and Antarctic sea, snow, and freshwater lake ice covers, the field and laboratory data obtained during this study present the first reported information on microbial communities within riverine frazil deposits. Observations of microbial abundance and diversity within the ice cover and the water column beneath indicate that microbial communities, probably in the form of biofilms supported by the river ice structure, may be important in wintertime DO processes.
Year: 2002