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  • Title: Nitrogen dynamics in Posidonia oceanica cuttings: implications for transplantation experiments.
    Author: Lepoint G, Vangeluwe D, Eisinger M, Paster M, van Treeck P, Bouquegneau JM, Gobert S.
    Journal: Mar Pollut Bull; 2004 Mar; 48(5-6):465-70. PubMed ID: 14980463.
    Abstract:
    A (15)N tracer study was performed during an experimental transplantation trial of natural Posidonia oceanica cuttings. The experiment was done in situ at 17 m depth in the Revellata Bay (Calvi, NW Corsica, France). Despite high survival rates of transplants (>90%) after one year, the weight and the N content of transplants are significantly lower than those of reference plants. In absence of roots, the transplants are not able to meet their N requirement, because leaf uptake is insufficient to replenish the N lost during the natural leaf decay. This could constitute a major cause of long-term failure for transplantation experiments or natural re-colonisation processes. The increase of the (15)N content in the roots shows that the plant re-allocates the nitrogen of one organ (i.e. leaves, rhizomes) to ensure the growth of another (i.e. roots).
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