Heavy metal concentrations and year-class structure of a venus clam Meretrix lusoria
Heavy metal concentrations and year-class structure of a venus clam Meretrix lusoria
复制标题
文蛤的重金属浓度和年级结构
DOI：
10.2331/suisan.54.709
复制
发表时间：
1988
影响因子：
0.4
通讯作者：
K. Ikuta
中科院分区：
文献类型：
--
作者：
K. Ikuta
该研究旨在论证产卵前软体中金属浓度与由壳长决定的年度结构之间的关系。金属含量测定样品按壳长2 mm分组，共组成26个分析组。采用原子吸收分光光度法测定了人体软体中Fe、Zn、Cu、Mn的含量。在1984年5月收集的样本群体中，按壳长划分的7个组分别相当于7个正态分布。它们是根据1984年和1985年连续采集的贝壳长度和贝壳重量的分析转换成相应的年级的。据估计，金星蛤的寿命超过9年。使用双对数图，金属浓度对干软体重回归到铁，铜和锰的线性函数，没有临界点的斜坡上。锌的两个临界点分别出现在壳长32-24和54- 56 mm之间。前者相当于二年级的μ-σ范围。后者位于μ-σ和五年级的μ之间。文蛤体内Fe、Cu、Mn的回归模式与文蛤有很大差异，但文蛤体内Zn的回归模式与文蛤体内Zn的回归模式部分相似，都在斜率上存在临界点。
The study was carried out to demonstrate the relationship between metal concentrations in soft bodies at the pre-spawning stage and year-class structure determined by shell length. The specimens for the determination of metal concentrations were divided into groups at the interval of 2mm in shell length, and 26 analytical groups were formed. The concentrations of Fe, Zn, Cu, and Mn in soft bodies were determined by atomic absorption spectrophotometry. In the sample population collected in May, 1984, the seven groups, by shell length, were equivalent to the seven normal distributions, respectively. They were converted into the respective year-classes on the basis of analyses for shell lengths and conch weights of the consecutive collec-tions during 1984 and 1985. The life-span of a venus clam was estimated to be more than nine years for the population. Using a double logarithmic diagram, metal concentrations against dry soft body weights regressed to linear functions for Fe, Cu and Mn; no critical points are on the slopes. On the other hand, the two critical points for Zn appeared in the ranges of 32-24 and 54-56mm shell length. The former was equivalent to the range of μ-σ of the second year-class. The latter was situated in the range between μ-σ and μ of the fifth year-class. The regressive patterns for Fe, Cu and Mn in the venus clam differed greatly from those in the wedge clam, but the patterns for zinc in the former was partly similar to that in the latter by having critical points on the slopes.