Assimilation of 210Po by the mussel Mytilus edulis from the alga Isochrysis galbana
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Marine invertebrates are thought to accumulate 210Po primarily from their food. In this study, a pulse-chase methodology was used to examine the assimilation and depuration of 210Po by Mytilus edulis from the common marine alga Isochrysis galbana. The digestion of 210Po from I. galbana occurred via a biphasic process, characteristic of a rapid (extracellular) and slow (intracellular) digestion typical of marine bivalves. The mantle/gill and foot have no known digestive role, yet their 210Po specific activities increased after 24 h. It is proposed that this increase in 210Po specific activity was related to 210Po being incorporated into these tissues from 210Po assimilated from I. galbana during extracellular digestion. It is proposed that the linear loss of 210Po previously accumulated by control mussels was related to the continual state of renewal and replacement of cellular proteins, with 210Po turnover and metabolism governed by protein turnover and metabolism. M. edulis' assimilation efficiency of 210Po from the 210Po-labelled alga was calculated to be 17.2 ± 2.1%, and thus similar to that of Ag, Cd, Co, Se and Zn by bivalves from other marine algae species. It is proposed that the assimilation efficiency of 210Po is a function of protein assimilation.
KeywordsAssimilation Bivalve Cellular Protein Alga Species Marine Alga
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