The analysis of high-resolution stratigraphic data from the Cenomanian–Turonian successions in three sections from Sinai (northeast Egypt) revealed the mechanisms behind water depth-driven biological responses (visible in changes of biodiversity and community structure) of macroinvertebrates. Quantitative biostratigraphical analysis of 127 samples containing 6203 specimens representing 41 genera of molluscs, corals, and echinoids were used to construct changes in the community structure of Cenomanian–Turonian macroinvertebrates. We identified six assemblages that we assigned to two main categories and linked to regional sea-level changes. The first group of assemblages is associated with the initiation of transgression and/or late normal regression, is dominated mainly by opportunistic, epifaunal suspension feeders (oyster bivalves) and is characterized by lower diversity values (low Shannon Index and high dominance). The second category is associated with the maximum flooding zone and dominated by infaunal deposit feeders such as irregular echinoids and by nektonic ammonites and is characterized by higher diversity. The increase in nektonic and decrease in benthic taxa during the latest Cenomanian suggest deepening of the environment. Moreover, the change in the water depth was accompanied by a change in the structure of the macrobenthos.

对西奈（埃及东北部）三个剖面 Cenomanian-Turonian 序列的高分辨率地层数据分析揭示了大型无脊椎动物水深驱动的生物反应（在生物多样性和群落结构的变化中可见）背后的机制。对 127 个样本进行了定量生物地层分析，其中包含代表 41 个软体动物、珊瑚和海胆动物属的 6203 个标本，用于构建 Cenomanian-Turonian 大型无脊椎动物群落结构的变化。我们确定了六个组合，将它们归为两个主要类别，并与区域海平面变化相关联。第一组组合与海侵的开始和/或晚期正常回归有关，主要由机会主义主导，Epifaunal 悬浮饲养者（牡蛎双壳类），其特点是多样性值较低（香农指数低，优势度高）。第二类与最大泛滥区有关，以不规则海胆类和游生菊石等动物沉积物为主，其特点是多样性较高。在最近的 Cenomanian 期间，nektonic 的增加和底栖类群的减少表明环境的加深。此外，水深的变化伴随着大型底栖动物结构的变化。在最近的 Cenomanian 期间，nektonic 的增加和底栖类群的减少表明环境的加深。此外，水深的变化伴随着大型底栖动物结构的变化。在最近的 Cenomanian 期间，nektonic 的增加和底栖类群的减少表明环境的加深。此外，水深的变化伴随着大型底栖动物结构的变化。