ハマグリ軟体部重金属濃度の季節変化〔英文〕

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Venus clams were collected, over four periods of time: May, August, October/November 1984 and March 1985, from Wama tidal flat situated in the south-western end of Seto Inland Sea. Manganese, copper, zinc and iron in whole soft bodies were quantitatively determined. Seasonal variations of the four metal concentrations are discussed in relation to the reproductive cycle. The concentration levels of four metals were as follows: iron>zinc>copper>manganese with seasonally considerable fluctuations in iron and manganese concentrations. This order, however, was consistently maintained throughout the year irrespective of sampling times. Manganese concentration in August decreased to about one-half of those in May, October/November and March, and was the lowest in the year. It is reasonably inferred that this reduction of manganese was induced by spawnings, particularly the discharging of ovarian substances, since the timing of reduction coincided with the final phase of spawning season and there were sexual differences in the metal contents between ovaries (high) and spermaries (low). The results of discriminant analyses were obtained by relatively high rates of the proper characters in the four sampling times, with the four variates of manganese, copper, zinc and iron concentrations. Relatively low discrimination rate (77.27%) was found in the sample data of May, since the five sample data among 22 analytical groups obtained in May exhibited the proper character of August.The concentration levels of three metals except copper in venus clams dwelling in the sheltered tidal flat were nearly equal to those in the wedge clams Latona cuneata inhabiting in the exposed sand beaches. Among 11 species of bivalves (7) and gastropods (4) the four metal concentrations in venus clams ranged at medium levels.
日本水産學會の論文

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生田國雄
宮崎大学農学部

ハマグリ軟体部重金属濃度の季節変化〔英文〕

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