A model for planktic foraminiferal shell growth
A model for planktic foraminiferal shell growth
复制标题
浮游有孔虫壳生长模型
DOI：
10.1017/s009483730001232x
复制
发表时间：
1993
期刊：
影响因子：
2.7
通讯作者：
R. Ott
中科院分区：
文献类型：
--
作者：
M. Signes;J. Bijma;C. Hemleben;R. Ott
本文分析了控制浮游有孔虫壳形态的生长规律。我们认为等距是理解它们的个体发生的关键。因此，我们的零假设是，这些生物构建等距壳。为了验证这一假设，用个人电脑生成了它们外壳的几何模型。结果表明，在对数螺旋螺旋结构中，早期腔室不能遵循严格的等距排列。在现实世界中，幼室的中心偏离对数生长曲线。幼虫阶段通常比成虫阶段更平螺旋，每轮含有更多的室室。为了保持连续腔室的几何级数，这些特征被证明是必不可少的。我们相信，幼年阶段标志着从一套幼年的生长参数到一个成年的结构桥梁。成虫阶段可以是严格等距的，也就是说，有效形状是恒定的，增加一个腔室后的体积增加与壳体原有的体积成正比。壳体积与生物量有关，壳表面积与壳体积之比与呼吸速率有关，壳总表面积与壳体积之比与总钙化力有关。研究了模型参数对这些关系的影响。只有初始半径和半径增加速率影响壳体积和表面积的关系。其他形状参数仅仅提供了这些关系的微调。大小本身在有孔虫的发育过程中起着重要作用。
In this paper we analyze the laws of growth that control planktic foraminiferal shell morphology. We assume that isometry is the key toward the understanding of their ontogeny. Hence, our null hypothesis is that these organisms construct isometric shells. To test this hypothesis, geometric models of their shells have been generated with a personal computer. It is demonstrated that early chambers in log-spirally coiled structures cannot follow a strict isometric arrangement. In the real world, the centers of juvenile chambers deviate from the logarithmic growth curve. Juvenile stages are generally more planispiral and contain more chambers per whorl than adult stages. These traits are shown to be essential in order to keep volumes of consecutive chambers in geometric progression. We are convinced that the neanic stage marks the constructional bridge from a juvenile set of growth parameters to an adult one. The adult stage can be strictly isometric, that is, the effective shape is constant and the increase in volume after a chamber addition is proportional to the preexisting volume of the shell. The shell volume is related to the biomass, the ratio of outer shell surface area to shell volume is related to the respiration rate and the ratio of the total shell surface area to shell volume is related to the total calcification effort. The influence of the parameters of the model on these relationships is investigated. Only the initial radius and the rate of radius increase affect the relationships between shell volume and surface area. The other shape parameters merely provide a fine tune-up of these relationships. Size itself plays a major role during foraminiferal development.
亲鸾与日本主义（七）——吉川英二的爱国主义
DOI：
--
发表时间：
2011
期刊：
考える人
影响因子：
--
作者：
ヤン・M・スミッツ;笹川明道;吉永一行(共訳);阪本拓人;須網隆夫;我妻学;Takatoshi Ito;Koji Tonami;中島岳志
通讯作者：
中島岳志