The assessment of the impacts of the expansion of the invasive species on taxonomic diversity, the abundance and dominance of groups of algae, the presence and/or absence of species of ecological interest that may or may not be indicative of water quality well mentioned, through the installation of a 20 × 20 cm quadrat representing the minimum area. The observation stations were visited monthly, during a repetitive three-year cycle, during the spring, summer and autumn seasons, periods of maximum growth and development of the algal flora and the results suggest the following facts. The invasive alga Caulerpa cylindracea Sonder, 1845 tends to colonise disturbed ecosystems reflecting a reduction in native algal diversity; in fact, we note a drastic impoverishment of the invaded algal community, represented by a limited number of Macrophyte algae accompanying the invasive taxon in phytosociological surveys and a Shannon-Weaver Diversity Index (H’) and Equitability reduced by 4.49 and 0.77 n the heavily affected station. The number of macroalgal species accompanying the invasive species has dropped by 52% in Salamandre. In addition, the multidimensional analysis, represented by the Hierarchical Ascendant Clustering applied to this case, confirms our results.

中文翻译：

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外来入侵物种Caulerpa cylindracea Sonder，1845年对阿尔及利亚西海岸的藻类植物群产生影响

通过以下方式评估入侵物种的扩展对生物多样性的影响，藻类群的丰度和优势，是否有生态意义的物种的存在和/或不存在，这些物种可能会或可能不会很好地表明水质，这是通过以下方式进行的评估：安装代表最小面积的20×20 cm方形支架。在一个重复的三年周期内，在春季，夏季和秋季，每月一次访问观测站，藻类菌群达到最大生长发育时期，结果表明以下事实。入侵藻类Caulerpa cylindracea Sonder，1845年倾向于在受干扰的生态系统中定殖，这反映了天然藻类多样性的减少；实际上，我们注意到被入侵的藻类社区极度贫困，在植物社会学调查中，伴随入侵分类群的数量有限的大型藻类藻类和香农-韦弗多样性指数（H'）表示，在受灾严重的地区，公平性降低了4.49和0.77。萨拉曼德省伴随入侵物种的大型藻类物种数量下降了52％。另外，以分层上升聚类为代表的多维分析也证实了我们的结果。