Linking evolution and development: Synchrotron Radiation X‐ray tomographic microscopy of planktic foraminifers
Linking evolution and development: Synchrotron Radiation X‐ray tomographic microscopy of planktic foraminifers
复制标题
连接进化和发育：浮游有孔虫的同步辐射 X 射线断层扫描显微镜
DOI：
10.1111/pala.12013
复制
发表时间：
2013
期刊：
影响因子：
2.6
通讯作者：
F. Marone
中科院分区：
文献类型：
--
作者：
D. Schmidt;E. Rayfield;Alexandra Cocking;F. Marone
摘要：由于化石记录中缺乏对个体发育阶段的保存，将灭绝生物的进化过程和发育联系起来通常会受到阻碍。 浮游有孔虫通过增加小室生长，是此类研究的理想目标生物，因为它们的测试包含了所有先前的发育阶段。以前，这些生物体的发育研究受到其早期腔室小尺寸的限制。在这里，我们描述了应用同步辐射X射线断层扫描显微镜（SRXTM）记录的有孔虫Globigerinoides sacculifer和Globorotalia menardii的个体发育史。我们的SRXTM扫描允许亚微米级的分辨率，从而显示额外的内部结构，如孔，溶解模式和壁生长的复杂性。我们的方法提供了一个强大的工具，挑选除了这些微体化石的发展历史，并随后协助推断系统发育关系和进化过程。
Abstract: Making the link between evolutionary processes and development in extinct organisms is usually hampered by the lack of preservation of ontogenetic stages in the fossil record. Planktic foraminifers, which grow by adding chambers, are an ideal target organism for such studies as their test incorporates all prior developmental stages. Previously, studies of development in these organisms were limited by the small size of their early chambers. Here, we describe the application of synchrotron radiation X‐ray tomographic microscopy (SRXTM) to document the ontogenetic history of the foraminifers Globigerinoides sacculifer and Globorotalia menardii. Our SRXTM scans permit resolution at submicrometre scale, thereby displaying additional internal structures such as pores, dissolution patterns and complexity of the wall growth. Our methods provide a powerful tool to pick apart the developmental history of these microfossils and subsequently assist in inferring phylogenetic relationships and evolutionary processes.