Jeff M. Sereda

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We examined the effect of ultraviolet radiation (UVR) on phosphorus availability in the surface waters of three thermally stratified Canadian shield lakes: Muskoka, Brandy, and Plastic. Study lakes were selected to encompass a range of chemical parameters (DOC, TP, pH, Fe, and NO−3) that have been shown to influence aquatic photochemistry. Differences in(More)
Ultraviolet radiation (UVR) may alter phosphorous (P) cycling by plankton through changes in the acquisition and/or regeneration of dissolved P. However, to date an effect of UVR on the uptake of P has not been observed at ambient phosphate (PO4 3−) concentrations. This has lead to the conclusion that the uptake of P by plankton may be insensitive to UVR.(More)
We investigated the effect of ultraviolet radiation (UVR) on the uptake and partitioning of radiophosphate (33PO 4 3− ) in size-fractionated plankton assemblages (0.2–0.8, 0.8–2.0 and >2.0 μm) collected from nine freshwater lakes located in Saskatchewan, Canada. A significant (p < 0.05) reduction in 33PO 4 3− uptake by plankton was observed in seven of the(More)
A fundamental step in the management of nutrient impacted water bodies is the determination of the type and degree of nutrient limitation. However, nutrient deficiency indicators often provide inconsistent results. Recent advances in the measurement of phosphate concentrations may provide a better means to understand results from P deficiency indicators.(More)
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