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首页> 外文期刊>Estuarine Coastal and Shelf Science >Sandy Beach Macrofaunal Communities On The Western Coast Of Portugal -is There A Steady Structure Under Similar Exposed Conditions?
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Sandy Beach Macrofaunal Communities On The Western Coast Of Portugal -is There A Steady Structure Under Similar Exposed Conditions?

机译：葡萄牙西海岸的沙滩大型动物群落-在相似的暴露条件下是否存在稳定的结构？

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摘要

The structure of macrofaunal communities at two similar exposed sandy beaches on the western coast of Portugal was monitored for approximately 18 months by sampling all the beach area, from the shoreline to the base of the dunes. The beaches' physical environment, as well as community density and composition, seasonal variations and the potential relationships between biological data and environmental parameters were studied. The two beaches had similar exposure to wave action, but differed in terms of sediment grain size, extent of the intertidal area, sediment moisture content and, especially, in the potential food availability in the form of allochthonous debris. Differences were observed with regard to the communities' structure, namely regarding composition and relative contribution of the dominant species. Seasonality, especially temperature variations, and the interaction between seasons and the beach zones (supralittoral vs. intertidal) also had a strong influence on communities: controlling dominant species' density and the horizontal distribution of the dominant species, and promoting a differential utilization of the beach by several resident macrofaunal animals. The present study allows the identification of key species in exposed sandy beaches of western Portugal and demonstrates that a steady community structure does not persist in the similarly exposed conditions observed, which may be mainly a response to distinct detritus subsidies, combined with differences in sediment grain size, sediment moisture content and extent of the intertidal area.
机译：通过采样从海岸线到沙丘底部的所有海滩区域，对葡萄牙西海岸两个相似的裸露沙滩的大型动物群落结构进行了大约18个月的监测。研究了海滩的自然环境，以及群落密度和组成，季节变化以及生物学数据与环境参数之间的潜在关系。这两个海滩的波浪作用相似，但是在沉积物粒度，潮间带范围，沉积物水分含量，特别是在异源碎屑形式的潜在食物供应方面有所不同。在群落结构方面，即优势物种的组成和相对贡献方面，观察到差异。季节性，尤其是温度变化，以及季节与海滩区域之间的相互作用（沿潮间带和潮间带）也对群落产生了很大影响：控制优势种的密度和优势种的水平分布，促进对优势种的差异利用。在海滩上有几只常驻的大型动物。本研究允许鉴定葡萄牙西部裸露沙滩中的关键物种，并表明在观察到的相似裸露条件下，稳定的群落结构不会持续存在，这可能主要是对独特碎屑补贴的反应，以及沉积物颗粒的差异大小，沉积物水分含量和潮间带范围。

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