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首页> 外文期刊>Marine ecology >Macrofaunal spatial distribution and community structure in a lagoon without a river discharge (the Oualidia lagoon, NW Morocco)
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Macrofaunal spatial distribution and community structure in a lagoon without a river discharge (the Oualidia lagoon, NW Morocco)

机译：在没有河流放电的泻湖中宏观空间分布和社区结构（欧亚利亚盐湖，摩洛哥）

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摘要

The assemblage structure and spatial distribution patterns of macrobenthic communities according to environmental conditions were analysed through five samplings carried out at 14 intertidal soft sediment stations in the Oualidia lagoon (NW Morocco). A total of 89 macrobenthic taxa were collected, amounting to 55.188 specimens. Molluscs, polychaetes and arthropods were the most species-rich groups. The snail Peringia ulvae was the most dominant species, especially abundant in the mid- and upper lagoon sections (nearly 64% of the total specimens gathered), followed by the mollusc Scrobicularia plana (10%). Diversity values were generally low (3 bit) pointing out the high dominance by few species. Multivariate analyses clearly distinguished three distinct macrobenthic assemblages, successively distributed from lagoon inlets towards inner parts. Nevertheless, each assemblage was found in particular habitat types and had a specific species composition in response to different environmental characteristics. (a) The Scolelepis fuliginosa community occupied sandy substrates at the lower section of the lagoon with stronger marine influence and, (b) the P. ulvae community lived in sandy-muddy substrates, including two sub-communities dominated, respectively, by Cerastoderma edule, S. plana and Tritia pfeffeiri inhabiting the middle section and S. plana the upper section. The combination of salinity, temperature, pH and silt content was identified as the major environmental variable subset with the highest correlation with the observed macrofaunal patterns and silt fraction as the single best correlated variable. The results demonstrated significant spatial differences in macrobenthic assemblage structure and composition along environmental gradients in spite of the absence of direct freshwater river inflow.
机译：通过在Oualidia泻湖（NW Morocco）的14个透模软沉积站进行的五个采样分析了根据环境条件的宏观环境条件的组合结构和空间分布模式。共收集89个宏观素分类群，达到55.188个标本。软体动物，多重和节肢动物是最丰富的群体。蜗牛佩滕西娅Ulvae是最占主导地位的物种，特别是泻湖部分和上部泻湖部分（收集总标本的近64％），其次是Mollusc Scrocicularia Plana（10％）。多样性值通常是低（<3位），指向少数物种的高级统治。多变量分析清楚地区分三个不同的大型宏观组合，连续分布从泻湖入口朝内部分布。然而，每种组合被发现特别栖息地类型，并且具有响应于不同的环境特征的特定物种组合物。 （a）脊髓植物富尼菌属群落在泻湖的下部占用的沙质基材，具有较强的海洋影响，（b）乌鲁瓦群落居住在沙质泥泞的基材中，其中分别由Cerastoderma Edule分别主导了两个子社区，S. Plana和Tritia Pfeffeiri居住中间部分和S. Slara的上部。盐度，温度，pH和淤泥含量的组合被鉴定为主要的环境变量子集，与观察到的大型宏观图案和淤泥级分作为单一最佳相关变量的相关性最高。结果表明，尽管没有直接的淡水河流流入，但沿着环境梯度的宏观组合结构和组合物的显着空间差异。

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