Abstract
Aquatic macrophytes play a central role in preserving the ecological equilibrium of shallow lakes and in the restoration of eutrophic lakes that have switched to phytoplankton-dominated turbid water. Massaciuccoli Lake, a shallow lake located along the Tuscan coast in Italy, has shown a constant and progressive simplification of the submerged plant community, for anthropogenic reasons, leading, in recent years, to turbid water. The growth and nutrient absorption capability of two macrophyte species, Myriophyllum verticillatum L. and Elodea canadensis Michaux, in the lake was investigated, with the prospect of a future lake restoration programme centred on their replacement. Mesocosm experiments were conducted to monitor the plant growth and nutrient (NO −2 , NO −3 , NH +4 , Ntot, PO 3−4 , Ptot) content in the plant dry matter and water at the beginning and at the end of the trial. Bacterial activity was analysed in the water in order to verify the possible nutrient absorption contribution by organisms other than plants. Both M. verticillatum and E. canadensis showed satisfactory growth and nutrient reduction in the water body. Moreover, their different growth patterns suggested that optimal replacement can be performed with their introduction in two steps, starting with M. verticillatum, which shows the best capacity to colonise the aquatic environment, due to its tendency towards lengthening.
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This work was funded by Parco Naturale di Migliarino San Rossore Massaciuccoli, Pisa, Italy.
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Ciurli, A., Zuccarini, P. & Alpi, A. Growth and nutrient absorption of two submerged aquatic macrophytes in mesocosms, for reinsertion in a eutrophicated shallow lake. Wetlands Ecol Manage 17, 107–115 (2009). https://doi.org/10.1007/s11273-008-9091-9
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DOI: https://doi.org/10.1007/s11273-008-9091-9