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- W2034266268 abstract "The effect of nutrient regime on periphyton community development in large rivers was examined (sites ranged from oligotrophic to eutrophic). Patterns in diatom community structure were examined at a large spatial scale (ultimate), whereas at the microhabitat scale (proximate), artificial nutrient-diffusing substrata were used to examine periphyton response to amendment with nitrogen, phosphorus, and N + P. Ratios of ambient dissolved inorganic nitrogen to total phosphorus were used to make predictions of nutrient limitation (molar total inorganic nitrogen (TIN) : total phosphorus (TP)), which matched experimental results in 8 of 12 sites. Two sites with highest ambient nutrient levels (mean NO 3 + NO 2 and TP, 1.49 and 0.081 mg·L 1 , respectively) possessed the highest diatom richness and diversity (mean richness = 42). Lowest diatom taxa richness (19) occurred in an impounded system with low TP (0.008 mg·L 1 ). Principal components analysis (PCA) of diatom taxa structure among sites (control treatments only) and small-scale patterns among nutrient treatments using all sites and treatments combined indicated that sites were grouped according to drainage basin (r 2 = 0.79) and that there was no unified response to enrichment (r 2 = 0.43). Results suggest that large spatial scale factors are more important in determining the potential benthic diatom assemblage than small-scale, proximate variables provided by the diffusers." @default.
- W2034266268 created "2016-06-24" @default.
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- W2034266268 date "2002-03-01" @default.
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- W2034266268 title "Regional patterns in periphyton accrual and diatom assemblage structure in a heterogeneous nutrient landscape" @default.
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- W2034266268 doi "https://doi.org/10.1139/f02-021" @default.
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