Bonanno Giuseppe, Di Martino Vincenzo
Department of Biological, Geological and Environmental Sciences, University of Catania, Via Antonino Longo 19, 95125 Catania, Italy.
National Research Council (CNR), Institute of the Mediterranean Agricultural and Forest Systems, Via Empedocle 58, 95128 Catania, Italy.
Mar Pollut Bull. 2017 Mar 15;116(1-2):196-203. doi: 10.1016/j.marpolbul.2016.12.081. Epub 2017 Jan 6.
This study investigated the trace element bioaccumulation capacity of the Mediterranean seagrass Posidonia oceanica, and its suitability as a bioindicator of contamination in water and sediments. Results showed that P. oceanica leaves accumulate higher concentrations of Ni and Zn. Since P. oceanica regenerates its leaves periodically, the higher concentrations in aerial organs may suggest a "removal" strategy according to which P. oceanica accumulates greater concentrations of trace elements in its temporary organs. In turn, P. oceanica seems to adopt an exclusion strategy for toxic non-essential elements (As, Cr, Pb). Results showed also that P. oceanica organs are correlated with As, Cd, Cu, Ni, and Zn concentrations in sediments. No significant relationship was found between P. oceanica and water. This study showed that P. oceanica may adopt different tolerance strategies compared to mainland-rooted macrophytes, and its possible use as a bioindicator of trace elements in sediments should be considered.
本研究调查了地中海海草波喜荡草的微量元素生物累积能力，以及其作为水体和沉积物污染生物指示物的适用性。结果表明，波喜荡草的叶片积累了较高浓度的镍和锌。由于波喜荡草会定期更新其叶片，地上器官中较高的浓度可能表明一种“去除”策略，即波喜荡草在其临时器官中积累更高浓度的微量元素。反过来，波喜荡草似乎对有毒的非必需元素（砷、铬、铅）采取了排除策略。结果还表明，波喜荡草的器官与沉积物中砷、镉、铜、镍和锌的浓度相关。在波喜荡草与水体之间未发现显著关系。本研究表明，与生长在陆地上的大型植物相比，波喜荡草可能采取了不同的耐受策略，应考虑其作为沉积物中微量元素生物指示物的潜在用途。
