Interacción entre Salvinia minima y Lemna gibba

• de Cabo, Laura ^[2] ; Casares, M. V. ^[2] ; Seoane, R. ^[1]
  1. [1] Universidad de Buenos Aires

     Universidad de Buenos Aires

     Argentina

     
  2. [2] Museo Argentino de Ciencias Naturales Bernardino Rivadavia-CONICET
• Localización: Biología Acuática, ISSN 0326-1638, ISSN-e 1668-4869, Nº. 26, 2009 (Ejemplar dedicado a: Trabajos completos de V Congreso de Ecología y Manejo de Ecosistemas Acuáticos Pampeanos), págs. 63-70
• Idioma: español
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• Resumen

  • Nutrient uptake and competitive ability of the aquatic species Lemna gibba and Salvinia minima were evaluated. The experiment was carried out in a greenhouse and plants were grown as mono-plant cultures and mixed-plant cultures. Three different media were used: tap water and the chemically defined media Lemna and Hutner 1/10. Duration of the experiment was 7 days. Initial and final dry weights and DIN and SRP concentrations were determined. Relative growth rates (RGR) and nutrient uptake rates were calculated. L. gibba´s RGR values increased significantly in Hutner 1/10 medium when types of cultures were analyzed separately. RGR values decreased in Lemna and Hutner 1/10 media in mixed-plant cultures. S. minima did not show significant differences in its RGR values. In mono-plant cultures N and P uptake rates in Lemna medium were significantly larger for L. gibba. In Hutner 1/10 medium P uptake rate was greater for S. minima and N uptake rate was larger for L. gibba. The presence of S. minima negatively affected L. gibba´s growth.