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Quantification of crystal units in foraminiferal wall and the phylogenetic evaluation

有孔虫壁晶体单元的定量和系统发育评价

基本信息

批准号：
08640591
负责人：
NOMURA Ritsuo
金额：
$ 1.41万
依托单位：
Shimane University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640591/
关键词：
foraminifera wall structure wall texture crystal phylogeny environment quantification 殻壁粒状構造生体鉱物

项目摘要

Three types of wall texture, microgranular, granular, and radial, have been known in the foraminifera. These textures are discriminated by the polarized features that showing the amoeba-shaped crystal units and their structure in the walls. The size of the crystal units is also significant for their discrimination. Based on these polarized features, some ideas applying the systematic criteria for foraminiferal taxonomy have been developed. Accepting this idea, however, externally similar forms distribute in different phylogenies. There have been problems for the application of the wall texture in the systematics.Apparently the optical features of walls are controlled by the wall thickness. Crystal units appear small for the thick-walled forms, whereas they appear large for the thin-walled ones. If the optical textures of walls are exactly controlled by their wall thickness, we have to clear this optical relationships. Thus I aimed to clear these features in different growth as well as different species with the microgranular and granular textures (as the types of jagged-granular and mosaic-granular). In order to analyze quantitatively the crystal units, automatic processing methods are introduced by using computer.I have understood that the optical features of wall textures are exactly determined by the wall thickness. Also there features are changed through their growth. I understand that wall thickness of foraminifera is basically controlled by their microhabitats including the life style. By using this relationship wall texture and wall thickness, we can evaluate their ecology. However, basic texture of walls is stable character for foraminiferal species.

有孔虫有三种类型的壁纹理：微粒状、颗粒状和放射状。这些纹理通过偏振特征来区分，这些特征显示了阿米巴形晶体单元及其在墙壁中的结构。晶体单元的大小对于区分也很重要。基于这些两极分化的特征，一些应用有孔虫分类学系统标准的想法已经被提出。然而，接受这个想法，外部相似的形式分布在不同的系统发育中。壁纹理在系统学中的应用一直存在问题。显然，壁的光学特征是由壁厚度控制的。对于厚壁形式的晶体单元显得较小，而对于薄壁形式的晶体单元则显得较大。如果墙壁的光学纹理完全由其壁厚控制，我们就必须弄清楚这种光学关系。因此，我的目的是明确不同生长以及不同物种的微颗粒和颗粒纹理（如锯齿颗粒和马赛克颗粒类型）的这些特征。为了对晶体单元进行定量分析，引入了计算机自动处理方法。我了解到壁纹理的光学特征正是由壁厚决定的。此外，它们的特征也会随着它们的成长而改变。据我了解，有孔虫的壁厚基本上是由它们的微生境（包括生活方式）控制的。通过利用壁纹理和壁厚度的这种关系，我们可以评估它们的生态。然而，壁的基本结构对于有孔虫物种来说是稳定的特征。