Seasonal modification of tidal flat sediment dynamics by seagrass meadows of Zostera noltii (Bassin d'Arcachon, France)
Seasonal modification of tidal flat sediment dynamics by seagrass meadows of Zostera noltii (Bassin d'Arcachon, France)
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DOI：
10.1016/j.jmarsys.2011.11.027
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发表时间：
2013-01-01
影响因子：
2.8
通讯作者：
Verney, R.
中科院分区：
文献类型：
--
作者：
Ganthy, F.;Sottolichio, A.;Verney, R.
阿尔卡雄泻湖（大西洋海岸，法国西南部）是一个中潮海湾，其中海草床殖民化的大部分潮间带。近年来，大叶藻草甸的表面积大大减少，可能会对泻湖的沉积物平衡产生影响。然而，人们对这种相互作用知之甚少，对水文沉积过程与小型潮间带草甸（如Z。noltii，是有限的。一个潮间带的泥滩，与可变的草甸覆盖度，在年度调查期间进行了研究。这项研究包括对海床高度、潮汐高度和波浪进行连续高频监测。沉积物参数和草甸特征进行了分析，每月收集的样品。声学测高被验证为一种有效的方法来测量床高程在植被环境中，尽管存在的换能器下的树叶。声学高度计也被证明有可能准确地估计冠层高度在淹没environment.Our调查数据显示厘米床在所有植被站的加积。草地的季节性生长与土壤的吸积量呈正相关。在季节性退化期间，草甸防止了海床的侵蚀。这些结果突出了海草作为生态系统工程师的重要作用。(C)2011 Elsevier B.V.保留所有权利。
The Arcachon lagoon (Atlantic coast, SW France) is a mesotidal embayment where seagrass beds colonize the majority of intertidal areas. In recent years, the surface area of Zostera noltii meadows has considerably decreased, with possible consequences for the sediment balance of the lagoon. However, such interactions are poorly understood, and knowledge of the relationship between hydro-sedimentary processes and small intertidal meadows, such as Z. noltii, is limited.An intertidal mudflat, with variable meadow coverage, was studied during an annual survey. The study consisted in continuous high-frequency monitoring of bed altimetry, tidal elevation and waves. Sediment parameters and meadow characteristics were analyzed using samples collected monthly. Acoustic altimetry was validated as an efficient method to measure bed elevation in a vegetated environment, despite the presence of leaves under the transducer. The acoustic altimeter was also shown to have the potential to accurately estimate canopy height in a submerged environment.Our survey data showed centimetric bed accretion at all vegetated stations. Accretion was positively correlated with seasonal growth of the meadows. During seasonal degeneration, the meadow prevented erosion of the sea bed. These results highlight the important role of seagrasses as ecosystem engineers. (C) 2011 Elsevier B.V. All rights reserved.