Nutrient addition experiments in Lago Jacaretinga,Central Amazon,Brazil: 2. The effect of humic and fulvic acids |
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Authors: | A. H. Devol A. Dos Santos B. R. Forsberg T. M. Zaret |
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Affiliation: | (1) College of Marine and Fisheries Sciences, WH-10, University of Washington, 98195 Seattle, WA, U.S.A.;(2) Instituto Nacional de Pesquisas da Amazonia. C.E.P., 69000 Manaus, Amazonas, Brazil;(3) Institute for Environmental Studies, FM-12, University of Washington, 98195 Seattle, WA, U.S.A. |
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Abstract: | Enrichment experiments consisting of additions of nutrients (nitrogen and phosphorus) and humic and fulvic acids were carried out using natural phytoplankton assemblages from Lago Jacaretinga, Central Amazon, Brazil. The addition of nutrients resulted in greatly stimulated primary production whereas addition of humic and fulvic acids had no effect. When both nutrients and humic and fulvic acids were added in combination, algal community response was identical to treatments in which only nutrients had been added. The result contrasts with previous phytoplankton culture studies in which the addition of humic material to the culture media increased production. Comparison of absorbance spectra indicated a severe reduction in the quantity and quality of light in Amazonian black waters relative to that in white waters . |
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Keywords: | lakes Amazon primary production tropics |
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