【作者】 童光辉；

【导师】 张兴亮；

【作者基本信息】 西北大学 ， 古生物学与地层学， 2011， 硕士

【摘要】 从自然环境中分离出多种微生物分别进行纯培养获得其稳定的菌落形态,并将其与部分生物属性归属存在较大争议的埃迪卡拉型化石进行形态对比研究,发现1)芽孢杆菌菌落与Albumares brunsae, Anfesta stankovskii具有相似的多级分支放射脊和独立小扇区结构。2)酵母菌菌落可发育与Beltanelloides sorichevae相似的圆盘状轮廓和同心环纹。3)Cyclomedusa普遍具有的圆盘状轮廓、同心环纹、中心凸点和放射沟这几个形态特征在霉菌菌落中均可观察到。4)铁细菌菌落与Tirasiana concentralis和Cyclomedusa具有相似的形态和结构。研究还发现,微生物菌落不仅形态稳定,而且质地坚硬,具有一定的抗压实作用。因此,其压痕完全有可能在地层中保存。本项研究表明部分埃迪卡拉型生物化石很可能是微生物菌落的压痕,因而为解释一些化石的生物属性提供了新的思路。更多还原

【Abstract】 A number of microbial species are isolated from the natural environment, enriched and purely cultured. Forms of their colonies are compared with certain Ediacara-type fossils whose affinities has remained considerable controversial for many years. Firstly, our results show that Bacillus can form multi-level branch colonies with independent sectors, which resemble Albumares brunsae and Anfesta stankovskii in morphology and structure. Secondly, Yeast colonies can develop morphological features, such as circular outline and annulations, to resemble Beltanelloides sorichevae. Thirdly, morphological characters generally appear in Cyclomedusa species can also be observed on Mold colonies, e.g. disc-shaped contour, annulations, center salient point and radial grooves. Fourthly, iron bacteria colonies and Tirasiana concentralis, Cyclomedusa have similar morphology and structure. The study also found that microorganism colonies have rigid nature and are resistant to mechanical compaction to some extent. Therefore, it is entirely possible for such colonies to be preserved in rocks as impressions. This research implies that some of the Ediacarian fossils are likely to be impressions of microbial colonies.更多还原