Form and environment of Gryphaea arcuata
Form and environment of Gryphaea arcuata
复制标题
弓斑螟的形态与环境
DOI：
10.1080/00241160310003081
复制
发表时间：
2003
期刊：
影响因子：
1.5
通讯作者：
B. Lathuilière
中科院分区：
文献类型：
--
作者：
L. Nori;B. Lathuilière
Gryphaeaericata是研究最多的化石之一，但其详细的古生态学在很大程度上被忽视了。标本收集在一个很短的地层范围内（三个菊石带）在'Calcaire一gryphees'的Xeuilley（洛林，法国）日期Hettangian下Sinemurian。尽可能地从剖面的每个泥灰岩层中取样。生物测定和同位素分析的有机质测量和孢粉学数据进行了比较，结果表明，G。植物和环境参数。造成不同形状的因素是温度、海底氧气水平和营养水平。两种主要的形态类型与两种环境有关。第一阶段受相对湿热的气候控制，有向富营养化发展的趋势，其生长速度慢，壳小、宽、薄;第二种环境比第一种环境温度低，更接近于G.在生长速度上，牡蛎壳大、厚、窄，生长速度快。
Gryphaea arcuata is one of the most studied fossils, but its detailed palaeoecology has been largely neglected. Specimens were collected within a short stratigraphic range (three ammonite zones) in the ‘Calcaire a gryphees’ of Xeuilley (Lorraine, France) dated Hettangian to Lower Sinemurian. As far as possible, they were sampled from each marly bed of the section. A biometric study and an isotopic analysis are compared in regard to organic matter measurements and palynological data, the results demonstrating a clear relationship between the shape of G. arcuata and environmental parameters. Factors responsible for the various shapes are temperature, oxygen levels on the sea floor and nutrient levels. Two main morphotypes can be related to two kinds of environment. In the first, controlled by a relatively hot and humid climate and tending towards eutrophication, the growth rate of Gryphaea was low, and the shells small, wide and thin. In the second environment, cooler than the first one and closer to the optimal living conditions of G. arcuata, the shell was large, thick and narrow, and exhibited a high growth rate.