摘要
为了探究四角蛤蜊贝壳中颜色分布以及金属元素含量特征,本试验以天津大港和东疆港地区四角蛤蜊(Mactra veneri-formis)紫色和白色壳色群体为研究对象,采用体视显微镜观察法、原子吸收光谱仪(AAS)测定法,比较分析不同壳色贝壳着色分布特点,以及 2 个地区紫色、白色壳色四角蛤蜊的棱柱层、珍珠层的金属元素含量组成,全面了解不同壳色群体之间金属元素含量的异同点.结果表明:四角蛤蜊紫壳群体的壳内侧比壳外侧显示出更深的紫色,紫色色素主要分布于贝壳棱柱层与角质层、棱柱层与珍珠层的交界处;Na元素和K元素在大港地区的 2 个壳层中,紫色群体含量均显著高于白色群体,Mg元素在 2 个地区2 个壳层中,紫壳含量均显著高于白壳.综上,四角蛤蜊贝壳中颜色分布在壳层交界处,Mg元素可能与四角蛤蜊的紫壳形成有关.
Abstract
To explore the color distribution and metallic elements contents characteristics in Mactra veneriformis,this experiment fo-cused on the purple and white shell populations of Mactra veneriformis in the Dagang and Dongjiang Port areas in Tianjin.We ana-lyzed the coloring distribution characteristics and the contents of four metallic elements in prismatic layer and nacreous layer of shells from purple and white color in surf clam(Mactra veneriformis)by stereomicroscope observation and atomic absorption spectrophotome-try(AAS).The shell color of the inner side of purple groups appeared deeper than the outer side,and the main part of the color was distributed at the junction of the prismatic layer with the horny layer and the prismatic layer with the nacreous layer.The Na and K contents in purple groups were obviously higher than those in white groups in both shell layers,Dagang area.The content of Mg in purple groups was significantly higher than those in white groups in both shell layers in both two areas.In conclusion,the color distri-bution in Mactra veneriformis was at the junction of the shell layer,and the element of Mg might be related to the formation of the purple shell of the four cornered clam.
维普
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