The intertidal areas of the Hauts-de-France (English Channel – France) stand out for the occurrence of fragile ecosystems that are exposed to natural and human–induced stress. Over the last two centuries, the northern part of this region has experienced a strong human pressure, with the settlement of numerous activities (i.e., metallurgic factories, harbors, embankments). On the contrary, the southern part includes mostly natural areas. The whole region is influenced by a macrotidal regime. A multidisciplinary approach based on sedimentological (grain-size), geochemical (trace metals, biomarkers) and biological (foraminifera) proxies was used to unravel the contrasting environmental conditions in the Hauts-de-France. Three foraminiferal-types communities, which reflect different ecological characteristics at regional scale, were identified: 1) estuarine macrotidal assemblages (Haynesina germanica associated to Elphidiidae) in low impacted estuaries; 2) industrial-perturbed assemblages (H. germanica and Cribroelphidium excavatum) in harbor areas; and 3) infaunal-dominant assemblages (Bolivina variabilis and B. pseudoplicata) in embankment areas. The outcomes of this study show that a multiproxy procedure needs to be adopted for properly characterizing intertidal ecosystems, where human impacts and natural stresses overlap and are hard to disentangle.

法兰西岛上的潮间带地区（英吉利海峡–法国）在脆弱的生态系统中脱颖而出，这些生态系统暴露于自然和人为的压力之下。在过去的两个世纪中，该地区的北部经历了巨大的人类压力，解决了许多活动（例如，冶金工厂，港口，堤防）。相反，南部大部分是自然区域。整个地区受到巨潮制度的影响。基于沉积学（粒度），地球化学（痕量金属，生物标志物）和生物（有孔虫）代理的多学科方法被用来揭示法兰西上特的不同环境条件。确定了三个有孔虫类型的群落，它们在区域范围内反映了不同的生态特征：在低受影响的河口，与德国象牙甲科（Elphidiidae）有关的德国海草 2）在港口地区受到工业干扰的组合体（H. germanica和Cribroelphidium excavatum）；3）路堤地区的主要优势种群（Bolivina variabilis和B. pseudoplicata）。这项研究的结果表明，需要采用多重代理程序来正确地描述潮间带生态系统的特征，在潮间带生态系统中，人类影响和自然压力会重叠且难以解开。