Relationships between free cadmium ion activity in seawater, cadmium accumulation and subcellular distribution, and growth in polychaetes.
We have examined the relationships between Cd ion activity [Cd2+], in seawater, Cd accumulation and subcellular distribution and growth in the polychaete Neanthes arenaceodentata. Organisms were exposed for 3 weeks to a range of [Cd2+] in a Cd-chelate buffer system. Cadmium accumulation and growth were monitored weekly for each exposure group and subcellular Cd distributions were determined at the end of the 3-week period. We found Cd associated with all of the subcellular fractions except the very low molecular weight ligands. Total Cd accumulation was greatest at day 7 and decreased over time in all but the highest [Cd2+] where it remained constant. For each point in time, however, there was a linear relationship between total Cd and [Cd2+] in seawater. Linear relationships were also observed between [Cd2+] and Cd loading in each subcellular ligand pool. Specific growth rates varied with both [Cd2+] and time in a nonlinear manner.
Jenkins
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D000818:Animals; D000845:Annelida / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D002104:Cadmium / Q000378:metabolism*; D003600:Cytosol / Q000378:metabolism; D008668:Metallothionein / Q000378:metabolism*; D008970:Molecular Weight; D012623:Seawater / Q000032:analysis; D013347:Subcellular Fractions / Q000378:metabolism
D002104:Cadmium; D008668:Metallothionein