Comparison Study on the ShellM inera logy of 9 Species of Modern Bivalves Living in Yellow Sea

FAN De-jiang; LIU Sheng-fa; ZHANG Ai-bing; YU Zi-shan; WANG Wen-zheng

9 popu lar species ofmodern bivalves living in Yellow Sea were selected for their shell mineral analyses. By means of X-ray powder diffraction method, the types ofminerals in the shells were discerned and their components were calculated. The result shows that aragonite or calcite is the dominant mineral in the shells. According to the component of mineral, shells were divided into three sub-type, namely, aragonite shell, calcite shell and mixed shell with component of mineral by > 98% aragonite, > 90% calcite, 37% aragonite and 63% calcite, respectively. Species in Veneroida, Arcida had aragonite shell. Species in Pterioida had calcite shell. And species in Mytiloida had mixed shell. This research suggests that mineral component of bivalve shell closely relates to its living pattern. Bivalves that live in the sand sediments are apt to form aragonite shell. In contrast, bivalves that live by attaching themselves on the hard bottom are apt to form calcite shell ormixed shell. Furthermore, this research a lso suggests that at least in some species the shell size has no sign ificant influence on the mineral component of the shell.

Ocean University of China, Qingdao Shandong 266003

Received Date: 2004-08-23

Rev Recd Date: 2004-12-23

Publish Date: 2005-09-10

Key words:

modern bivalve

Abstract: 9 popu lar species ofmodern bivalves living in Yellow Sea were selected for their shell mineral analyses. By means of X-ray powder diffraction method, the types ofminerals in the shells were discerned and their components were calculated. The result shows that aragonite or calcite is the dominant mineral in the shells. According to the component of mineral, shells were divided into three sub-type, namely, aragonite shell, calcite shell and mixed shell with component of mineral by > 98% aragonite, > 90% calcite, 37% aragonite and 63% calcite, respectively. Species in Veneroida, Arcida had aragonite shell. Species in Pterioida had calcite shell. And species in Mytiloida had mixed shell. This research suggests that mineral component of bivalve shell closely relates to its living pattern. Bivalves that live in the sand sediments are apt to form aragonite shell. In contrast, bivalves that live by attaching themselves on the hard bottom are apt to form calcite shell ormixed shell. Furthermore, this research a lso suggests that at least in some species the shell size has no sign ificant influence on the mineral component of the shell.

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Comparison Study on the ShellM inera logy of 9 Species of Modern Bivalves Living in Yellow Sea

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