A morphogroup analysis of the upper Hauterivian-lower Barremian foraminiferal assemblages from the Agua de la Mula Member of the Agrio Formation (Neuquén Basin, Argentina) reveled six associations based on benthic foraminiferal morphogroups identified by means of cluster analysis and treated with multivariate methods. In order to assess the paleoenvironmental significance of the morphogroup associations, they were evaluated in relation to sampled geographic localities, ammonite biozones, sedimentary facies, and position into depositional sequences of the five sections analyzed. For this purpose, the statistical techniques of RDA, partial-RDA, PERMANOVA, and PCoA were applied. The morphogroup associations MgFA1, MgFA4, MgFA5 and MgFA6 revealed high percentages of planoconvex, biconvex and conical forms, with an inferred epifaunal habit and active herbivorous feeding strategy. The remaining MgFAs2 and 3 are mainly represented by planispiral tests with lenticular, flattened and elongated forms, attributed to shallow infaunal lifestyle and detrital and bacterial scavenger feeding habit. Sedimentation rates and associated food availability were considered the main controlling factors in the distribution of morphogroups across the analyzed tract of the basin, revealing differences between proximal and distal sectors. In the sections characterized by higher terrigenous input, in a most proximal position of the basin, food increases downward in the sediments and so shallow infaunal morphogroups prevail (MgFAs2–3). At the same time, shallow infaunal-dominated associations are distributed throughout 3rd-order regressive systems tracts that commonly are associated with high sedimentation rates. Associations mostly represented by epifaunal morphogroups (MgFAs1, 4–6) recur at 3rd-order transgressive systems tracts where low sedimentary input characterizes the sequences, favoring long exposure of organic matter at the seafloor. Moreover, epifaunal forms with grazing herbivorous and detritivorous habits increase throughout the distal sector of the basin, following the decreasing supply of organic matter in settings farther from sedimentary input.

对阿格里奥组（阿根廷 Neuquén 盆地）Agua de la Mula 成员的上欧特里夫期-下巴雷姆期有孔虫组合的形态群分析揭示了基于通过聚类分析确定并用多元方法处理的底栖有孔虫形态群的六个关联。为了评估形态群组合的古环境意义，根据所分析的五个剖面的采样地理区域、菊石生物带、沉积相和在沉积序列中的位置对它们进行了评估。为此，应用了 RDA、部分 RDA、PERMANOVA 和 PCoA 的统计技术。形态群关联 MgFA1、MgFA4、MgFA5 和 MgFA6 揭示了高比例的平凸、双凸和圆锥形式，具有推断的动物习性和活跃的草食性喂养策略。剩余的 MgFAs2 和 3 主要以平面螺旋体测试为代表，具有透镜状、扁平和细长的形式，这归因于浅水动物的生活方式以及碎屑和细菌食腐动物的摄食习惯。沉积率和相关的食物供应被认为是形态群在流域分析区域分布的主要控制因素，揭示了近端和远端区域之间的差异。在以较高陆源输入为特征的部分中，在盆地的最近位置，沉积物中的食物向下增加，因此浅层内陆动物形态群占优势（MgFAs2-3）。同时，浅层内陆动物为主的群落分布在通常与高沉积率相关的三阶退化系统域中。主要由表底动物形态群 (MgFAs1, 4–6) 代表的关联在三级海侵系统区域重复出现，其中低沉积输入是序列的特征，有利于有机物在海底的长期暴露。此外，随着远离沉积输入的环境中有机物质供应的减少，具有放牧食草和食腐动物习性的表层动物形式在整个盆地的远端区域增加。有利于有机物长时间暴露在海底。此外，随着远离沉积输入的环境中有机物质供应的减少，具有放牧食草和食腐动物习性的表层动物形式在整个盆地的远端区域增加。有利于有机物长时间暴露在海底。此外，随着远离沉积输入的环境中有机物质供应的减少，具有放牧食草和食腐动物习性的表层动物形式在整个盆地的远端区域增加。