Zinc, copper and manganese in the razor clam, Siliqua patula Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/p8418r53r

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  • Zinc, copper and manganese concentrations were measured by atomic absorption spectroscopy in Siliqua patula collected during May, 1970 through May, 1971. Individual clams were analysed to determine the degree of variation among individuals, Statistical analysis proved the variation to be highly significant. Monthly composite samples of 18 clams were collected from three sites along the Washington-Oregon coast. The samples were analysed to examine differences in concentration among two general groups of tissue, collection sites and monthly concentrations within a site. Significant differences were found between the tissue groups, with copper and manganese being consistently higher in portion B (gills, liver, digestive system and reproductive tissue). Zinc was generally found in higher concentration in portion A (foot, neck, mantle, adductor muscle and reproductive tissue). A statistically significant difference was also noted between the three sites, however no pattern in the concentration was apparent. These results may indicate that the variation between sites reflects only the high degree of variability among individuals. Statistically significant differences were also noted between the months examined within each site. There appeared to be a general trend of increasing concentration in Spring and Summer for all three elements. Prior investigations indicate that the razor clam undergoes most of its growth activity in early Spring and most of its reproductive activity in late Spring and early Summer. It is possible that the increased concentration in Spring and Summer is responding to increased requirements due to changes in metabolic rate brought about by increased growth and the reproductive activity. However it is equally important to recognize that the monthly variation could be reflecting the 'variation among individuals.
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