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Growth and nutrient uptake of two species of Elodea in experimental conditions and their role in nutrient accumulation in a macrophyte dominated lake.

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  • Biology

Abstract

Growth and nutrient uptake by two species of <Emphasis Type="Italic">Elodea </Emphasis> in experimental conditions and their role in nutrient accumulation in a macrophyte-dominated lake Hydvobiologia 251: 13-18, 1993. A. Hillbricht-Ilkowska & E. Pieczyriska (eds), Nutrient Dynamics and Retention in Land/Water Ecotones of Lowland, Temperate Lakes and Rivers. 0 1993 Kluwer Academic Publishers. Printed in Belgium. 13 Growth and nutrient uptake by two species of Elodea in experimental conditions and their role in nutrient accumulation in a macrophyte- dominated lake Teresa Ozimek ‘, Ellen van Donk2 & Ramesh D. Gulati 3 ‘Department of Hydrobiology, Institute of Zoology, University of Warsaw, Nowy Swiat 67, 00-046 Warsaw, Poland; 2Department of Nature Conservation, Section of Aquatic Ecology, Agricultural University of Wageningen, P.O. Box 8080, 6700 DD Wageningen, The Netherlands; 3Limnological Institute, Vijverhof Laboratory, Rijksstraatweg 6, 3631 AC Nieuwersluis, The Netherlands Key words: submerged macrophytes, phosphorus and nitrogen cycling, hypertrophic waters Abstract The capacity of Elodea nuttallii (Planch.) St. John and Elodea canadensis Michx. to remove nitrogen from water was evaluated in laboratory experiment. The growth rate of plants and their effect on the nitro- gen level of hypertrophic Lake Zwemlust (the Netherlands) as well as on lake water enriched with ni- trogen were investigated. The plants grew best in water enriched with up to 2 mg NH,-N l- ’ and 2 mg NH,-N l- ’ plus 2 mg N03-N l- ‘. During a 14 day experiment, plants absorbed from 75 % to 90% of nitrogen. Higher nitrogen concentration than 4 mg l- ’ had a negative effect on growth of both spe- cies. Elodea nuttallii and E. canadensis prefer NO,+ over NO, when both ions were present in water in equal concentrations. Introduction Submerged macrophytes grow between the shore- line and open waters and they can intercept or modify material flows from land to the pelagial. Most of the

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