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Dickinsonia: mobile and adhered
Geological Magazine ( IF 2.0 ) Pub Date : 2021-04-12 , DOI: 10.1017/s0016756821000194
Andrey Ivantsov , Maria Zakrevskaya

The classical genus of Ediacaran macroorganisms, Dickinsonia, was part of an extensive benthic marine community inhabiting the fields of microbial mats. The remains of Dickinsonia are commonly preserved in the position of adhesion to the habitat substrate. However, these were mobile organisms. In addition to the already known feeding traces of Dickinsonia, structures described as traces of motor activity are reported. Long parallel furrows, extending from the posterior end of the body imprint, are interpreted as imprints of ridges left by an organism moving along the surface of the substrate. Groups of differently shaped grooves laying in the depression that enhalo the Dickinsonia body imprints or accompany their individual areas are interpreted as imprints of ridges and cords of mucous material. They are considered to represent structures of self-determined stretching and lift-off of the body margins from the substrate. The rings and arcs of silt- and sand-sized mineral particles bordering the body imprints are composed of material that was supposedly brushed off from the surface of the microbial mat by Dickinsonia. They are considered traces of the adhesion of these organisms to the substrate. Accumulations of multidirectional pulling and tear-off structures, lacking the body imprint but accompanied by the joint plane passing into the overlying sediment and cutting through the bedding, are interpreted as escape traces. The dual modality of the behaviour (attachment and mobility) could indicate the adaptability of Dickinsonia to life in extremely shallow-water environments.



中文翻译:

Dickinsonia:移动和粘附

埃迪卡拉大型生物的经典属狄更斯水母是居住在微生物垫领域的广泛底栖海洋群落的一部分。Dickinsonia的遗骸通常保存在与栖息地基质粘附的位置。然而,这些是移动的生物。除了已知的狄金森氏菌摄食痕迹外,还报道了被描述为运动活动痕迹的结构。从身体印记后端延伸的长平行沟被解释为有机体沿基底表面移动留下的脊印记。位于凹陷中的一组不同形状的凹槽,使狄更逊水母身体印记或伴随其个别区域的印记被解释为粘液材料的脊和绳索的印记。它们被认为代表了自我确定的拉伸结构和从基板上剥离身体边缘的结构。与身体印记接壤的淤泥和沙子大小的矿物颗粒的环状和弧形是由狄金森氏菌从微生物垫表面刷掉的材料组成的. 它们被认为是这些生物体粘附到基材上的痕迹。多向拉扯和撕裂结构的堆积,缺乏身体印记,但伴随着关节平面进入上覆沉积物并切割层理,被解释为逃逸痕迹。行为的双重模式(依恋和移动)可以表明狄更斯水母对极浅水环境中的生活的适应性。

更新日期:2021-04-12
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