Details

Autor(en) / Beteiligte

• Evrard, Victor
• Kiswara, Wawan
• Bouma, Tjeerd J.
• Middelburg, Jack J.

Titel

Nutrient dynamics of seagrass ecosystems: 15N evidence for the importance of particulate organic matter and root systems

Ist Teil von

• Marine ecology. Progress series (Halstenbek), 2005-06, Vol.295, p.49-55

Ort / Verlag

Oldendorf: Inter-Research

Erscheinungsjahr

2005

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• The availability of nitrogen in sediment phytodetritus to seagrass was investigated in 5 tropical species (Thalassia hemprichii,Halodule uninervis,H. pinifolia,Halophila ovalis/ovataandSyringodium isoetifolium) from Indonesia.15N-labeled phytodetritus was injected into the sediment and the appearance of15N in the roots, the rhizomes and the leaves of the plants were measured after 1, 2, 4 and 8 d. The transfer of15N from sediment phytodetritus to the plant tissues was very rapid (within 1 d) and continued over the 8 d period, indicating an efficient retention of the phytodetritus and a net mineralization of nitrogen rather than an immobilisation by bacteria. Relative enrichment of roots versus leaves indicated that 15N was taken up by the roots and then transferred to the leaves. The combined efficiency of seagrass canopy-induced trapping and retention of sestonic particles and root-uptake, results in the acquisition of nutrients released upon mineralization of particulate organic matter (POM), giving them a competitive advantage over other primary producers in oligotrophic environments.