Temporal dynamics and biomass partitioning in three Adriatic seagrass species: Posidonia oceanica, Cymodocea nodosa, Zostera marina

摘要: . The temporal dynamics of three seagrasses, Posidonia oceanica, Cymodocea nodosa and Zostera marina, was studied in different areas the Adriatic Sea by analysing phenological parameters biomass trends compartments seagrass systems. For this purpose, samplings were conducted 1997 once per season at each station, Otranto (southern Sea) Grado (northern Sea). Structural plant differed among seagrasses both absolute values seasonal variability. P. oceanica largest plant, showing highest number leaves shoot, leaf surface, Leaf Area Index shoot weight. Z. marina intermediate size had longest leaves, whereas C. smallest seagrass. accounted for total (mean ± SE: 1895.9 180.2 g DW · m–2; CV = coefficient variation: 19.0 %), considerably more than 410.4 88.4 g DW·m–2; CV: 43.1 %) 312.1 75.1 g 48.1 %), although two latter species displayed a higher Similarly, other features, such as density, LAI, weight relative contributions above- below-ground compartments, less variable across seasons while length showed fluctuation oceanica. As partitioning, proportion to above-ground (up 90 %), with distinct seasonality, (around 80 %) fairly constant during year. We infer that forcing is probably buffered availability internal resources stored permanently year below-ground. In instead, growth processes seem be amplified greater influence environmental factors.