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ANALYSIS OF TRACE ELEMENTS IN THE SHELLS OF SHORT-NECKED CLAM Ruditapes philippinarum (Mollusca : Bivalvia) WITH RESPECT TO RECONSTRUCTION OF INDIVIDUAL LIFE HISTORY

JUMPEI ARAKAWA

Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan

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WATARU SAKAMOTO

Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan

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NOBUAKI ARAI

Division of Social Informatics, Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan

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KOJI YOSHIDA

Division of Nuclear Engineering, Graduate School of Engineering, Kyoto University, Kyoto 611-0011, Japan

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https://doi.org/10.1142/S0129083598000169Cited by:0 (Source: Crossref)

Abstract

Strontium (Sr) concentration in the shells of short-necked clams collected at different locations (Shirahama, warm area and Maizuru, cold area, Japan) was analyzed by two methods, PIXE and EPMA. The Sr concentration of external surface of shell umbo, which was made during short term at early benthic phase, was analyzed by PIXE, and was ranged from 1000 to 3500 ppm for individuals. The Sr concentration of clams collected at Shirahama showed positive correlation with shell length (SL) in individuals with SL <31mm, whereas clams collected at Maizuru did not show significant correlation. This result may be caused from the difference of the spawning seasons between two areas. The Sr concentration of cross section of shell umbo, which develops thicker continuously during their life to form faint stratum structure, was analyzed by EPMA along the line across the stratum structure. Some surges and long term waving patterns of the Sr concentration were observed. These results suggest that the life histories of individual clams could be recorded in the shell umbo cross sections as variations of trace elements and analyses of trace elements could clarify the histories of individual clams.

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