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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >The response of benthic foraminifera to palaeoenvironmental disturbance: A quantitative approach in turbidite-like successions
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The response of benthic foraminifera to palaeoenvironmental disturbance: A quantitative approach in turbidite-like successions

机译：底栖有孔虫对古环境扰动的响应：类浊石演替中的定量方法

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摘要

Benthic foraminifera were collected from a number of samples of a turbidite-like succession, and quantitatively investigated with the aim to describe and interpret their distributional pattern prior, during and after the turbidite events. The foraminiferal assemblages contain indigenous benthic taxa that represent combined bottom-water and bottom-sediment controlled benthic environments and allochthonous benthic shelf taxa that are transported downslope into deeper-water biotopes. Considerable differences in diversity, community organization, feeding and habitat preferences are detected among benthic foraminiferal assemblages below, across and above the turbiditic episodes. Prior to the deposition of the turbiditic sands, the benthic foraminiferal assemblage is indicative of a strong preference of environments with highly elevated food supply, but sheltered from direct disturbance. This stability was disrupted by the recurrent deposition of turbiditic sands. In the lower part of the turbiditic sequence, some specialized endobenthic forms, such as Valvulineria complanata and Nonion spp. could keep pace with high sedimentation reflecting enhanced supply of organic matter by transport. In the upper part of the turbiditic sequence, an opportunistic fauna (Bolivina spathulata assemblage), entirely composed of infaunal elements, is observed, indicating a nutrient-rich substrate. The reduction in the dominance of Bolivina spp. and the reappearance of both infaunal and epifaunal taxa reflects the recovery of the benthic ecosystem.
机译：从许多类似浊石的演替样品中收集有孔有孔虫，并进行定量研究，目的是描述和解释浊石事件之前，期间和之后的分布模式。有孔虫组合包含代表底水和底泥控制底栖环境的原生底栖生物分类群，以及沿坡道向下输送到深水生物群落中的异地底栖生物分类群。在湍流发作期间，之后和之上，在底栖有孔虫群落之间发现了多样性，社区组织，觅食和生境偏好方面的显着差异。在沉积浑浊的沙之前，底栖有孔虫的聚集体表明对食物供应量较高但可避免直接干扰的环境的强烈偏爱。湍流砂的反复沉积破坏了这种稳定性。在湍流序列的下部，有一些专门的底栖动物形式，例如Valvulineria complanata和Nonion spp。可以跟上高沉积物的速度，这反映了运输中有机物的供应增加。在湍流序列的上部，观察到完全由不孕元素组成的机会性动物区系（Bolivina spathulata组合），表明其营养成分丰富。玻利维亚种的优势度降低。真菌分类群和表皮生物分类群的重新出现反映了底栖生态系统的恢复。

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