The Capitanian (late middle Permian) and end-Permian mass extinctions were particularly severe from a palaeoecological perspective. Previous studies of their expressions on land underscored their impacts on plants and vertebrates, but the effects on the continental invertebrate infauna remain poorly understood. A multiproxy analysis from the Iberian Basin (Central Spain) reveals a dramatic decrease in bioturbation intensity on land by the end of the Capitanian. This pattern cannot be explained by facies effects because our analysis is based on similar types of deposits through the succession and over an extensive area. The bioturbation crisis coincided with an increase in weathering intensity and acidic conditions, and a collapse in plant communities spanning the late Permian–Early Triassic in the Iberian Basin. Reduced bioturbation may have contributed to decrease in mechanical reworking of the sediment and soil, affected geochemical recycling, increased sediment acidification and impacted on ecosystem structure. Identification of this infaunal crisis on land underscores the ecological severity of mass extinctions and emphasises the significance of feedback loops in riparian ecosystems.

中文翻译：

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二叠纪大灭绝对大陆无脊椎动物的影响

从古生态学的角度来看，卡皮坦纪（二叠纪中晚期）和二叠纪末的大规模灭绝特别严重。以前对它们在陆地上的表达的研究强调了它们对植物和脊椎动物的影响，但对大陆无脊椎动物群的影响仍然知之甚少。来自伊比利亚盆地（西班牙中部）的多代理分析显示，到卡皮坦纪末期，陆地上的生物扰动强度急剧下降。这种模式不能用相效应来解释，因为我们的分析是基于通过连续和广泛区域的相似类型的沉积物。生物扰动危机与风化强度和酸性条件的增加以及伊比利亚盆地晚二叠世-早三叠世植物群落的崩溃同时发生。减少的生物扰动可能导致沉积物和土壤的机械再加工减少，影响地球化学循环，增加沉积物酸化并影响生态系统结构。识别陆地上的这种动物群危机强调了大规模灭绝的生态严重性，并强调了河岸生态系统中反馈回路的重要性。