The paper analyses the composition, structure and spatial organization of the soft-bottom macrozoobenthos inhabiting Oualidia lagoon (Moroccan Atlantic coasts), as well as their relationships with the main environmental variables. Material for the study was collected from 43 stations in winter 2013. A total of 56 taxa belonging to 6 phyla were recorded. Species diversity showed the highest values for molluscs, crustaceans and polychaetes. We used a Hierarchical Ascending Classification and a non-Metric Multidimensional Scaling to characterize the macrozoobenthos of the lagoon. We identified three groups of stations according to the outer, middle and inner part of the lagoon, hosting arranged from the outer -most to inner-most areas of the lagoon. The trophic structure of the macrozoobenthos was dominated in density by deposit-feeders (88.1%) and species richness by carnivores (20%) and detritivorous (20%). The BIO-ENV analysis showed that the combination of granulometry, salinity and temperature were the major factors controlling the spatial distribution of the macrozoobenthos in the Oualidia Lagoon.

本文分析了居住在瓦利迪亚泻湖（摩洛哥大西洋沿岸）的软底大型动物的组成，结构和空间组织，以及它们与主要环境变量的关系。2013年冬季，从43个站点收集了用于研究的材料。总共记录了56个类群，属于6个门。物种多样性显示出软体动物，甲壳类和多毛类动物的最高价值。我们使用了层次升序分类和非度量多维标度来表征泻湖的大型动物。我们根据泻湖的外部，中部和内部确定了三组站，它们的位置从泻湖的最外层到最内层。大型动物的营养结构在密度上受沉积物给料器的支配（88。1％），食肉动物（20％）和有害动物（20％）的物种丰富度。BIO-ENV分析表明，粒度，盐度和温度的结合是控制Oualidia泻湖中大型动物的空间分布的主要因素。