Gonadal and nongonadal zinc concentrations in mussels |
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| Authors: | PB Lobel DA Wright |
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| Institution: | 1. University of Newcastle upon Tyne, Dove Marine Laboratory, Cullercoats, Tyne and Wear, UK;2. University of Maryland, Center for Environmental and Estuarine Studies, Chesapeake Biological Laboratory, Solomons, MD 20688, USA |
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| Abstract: | Seasonal measurement of zinc levels in mussels (Mytilus edulis) from the Tyne estuary showed a small spring peak and an annual low in September. Zinc concentration was found to be significantly lower in gonadal tissue than in nongonadal tissue. Although gonadal dry weight was strongly negatively correlated with gonadal zinc concentration there was no significant relationship between gonadal dry weight and whole body zinc levels, indicating that gonadal state has little effect on zinc variability in these animals. However, a strong negative correlation was found between log gonadal zinc concentration and log nongonadal dry weight. Construction of a gonadal index (gonadal/nongonadal dry weight) shows that the seasonal peak zinc concentration in early May occurs before major spawning has taken place. It is concluded that the seasonal dynamics of zinc in this species can be explained in terms of growth of somatic rather than germinal tissue. |
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