Nutrient-chlorophyll trajectories across trophic gradients |
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Authors: | Knut L Seip Hein Sas Steven Vermij |
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Institution: | (1) Senter for industriforskning, Forskningsvn. 1, P.O. B. 124, Blindern, 0314 Oslo 3, Norway;(2) IMSA Instituut voor Milieu- en Systemenanalyse, Emmastraat 16, 1075 HT Amsterdam, The Netherlands |
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Abstract: | We estimate the response of chl-a (mg · m–3) to changes in concentrations of total phosphorus (TP) by calculating the slopeS = chl-a/TP in chl-a =f(TP) graphs. Results show that in years where algae are P-limited oligotrophic lakes respond less (median slope 0.21) to changes in nutrient concentrations than eutrophic lakes, (median slope 0.31) and these again less than hypereutrophic lakes, (median slope 1.02). We find no saturation value for the slope within the TP range considered (6–480 mg · m–3). Chl-a in eutrophic lakes responds more frequently to non-nutrient factors than oligotrophic and hypereutrophic lakes. Results obtained by replacing TP with a new nutrient parameter, TP = 0.056 · TP · IN0.226, in which inorganic nitrogen, IN, is factored in, suggest that nitrogen has an influence on chl-a in oligotrophic lakes. Blue-green algae respond less to changes in TP than other algal species, e.g., diatoms. |
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Keywords: | Eutrophication lake management phosphorus nitrogen chlorophyll-a slope estimator |
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