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AME 33:19-28 (2003)
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Abstract
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Sestonic bacterial nutrient limitation in a northern temperate river and the impact of pulp-mill effluents
Mohamed N. Mohamed1,2,*, Richard D. Robarts1
1National Water Research Institute, Saskatoon, Saskatchewan S7N 3H5, Canada
2Present address: Dept. of Biology, University of Waterloo, 200 University Ave. W., Waterloo, Ontario N2L 3G1, Canada
*Email: mmohamed@sciborg.uwaterloo.ca
ABSTRACT: Bacterial growth limitation and the effect of pulp-mill effluents (pme) on sestonic bacteria were studied in a northern temperate river (the Fraser River, British Columbia, Canada). Nutrient addition experiments demonstrated that sestonic
bacterial growth was potentially limited by p. Experiments were done by adding n, p, or organic carbon to 2 l microcosms of river water. The addition of p (singly, and in combination with N and C) increased bacterial production (rate of
3H-thymidine incorporation) and activity (14C-glucose uptake), while the addition of n or organic carbon did not. The inflow of PME into the Fraser River increased bacterial abundance, activity, and production in 2 ways. First, p in
the pme increased native bacterial abundance and processes, and second, pme provided a source of active bacteria to the river.
KEY WORDS: Bacteria · River · Phosphorus · Limitation · Pulp mill · Nutrient · Effluent · Sewage
Full text in pdf format
Published in AME Vol.
33, No. 1
(2003) on August 21
Print ISSN: 0948-3055; Online ISSN: 1616-1564.
Copyright © Inter-Research, Oldendorf/Luhe, 2003
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