Is the digestive gland of Mytilus galloprovincialis a tissue of choice for estimating cadmium exposure by means of metallothioneins?

• Published in: The Science of the total environment Vol. 333; no. 1; pp. 99 - 108
• Main Authors: Raspor, Biserka, Dragun, Zrinka, Erk, Marijana, Ivanković, Dušica, Pavičić, Jasenka
• Format: Journal Article
• Language: English
• Published: Shannon Elsevier B.V 15.10.2004; Elsevier Science
• Subjects: Animal, plant and microbial ecology; Animals; Applied ecology; Biological and medical sciences; Bivalvia - physiology; Cadmium - analysis; Cadmium - pharmacokinetics; Caged bivalves; Digestive gland mass variation; Digestive System - chemistry; Ecotoxicology, biological effects of pollution; Environmental Exposure; Environmental Monitoring - methods; Fundamental and applied biological sciences. Psychology; Marine; Metallothionein - analysis; Metallothionein - pharmacokinetics; Mytilus galloprovincialis; Reproducibility of Results; Seasons; Techniques; Tissue content of metallothioneins and trace metals; Tissue Distribution; Caged bivalves; Digestive gland mass variation; Mytilus galloprovincialis; Tissue content of metallothioneins and trace metals; Cadmium; Biological marker; Heavy metal; Trace element; Bivalvia; Digestive gland; Invertebrata; Mollusca; Metallothionein
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2004.05.008

A study performed over 12 months with caged mussels Mytilus galloprovincialis in the coastal marine zone, which is under urban pressure, reveals a temporal variation of digestive gland mass, which causes “biological dilution” of cytosolic metallothionein (MT) and trace metal (Cd, Cu, Zn, Fe, Mn) concentrations. The dilution effect was corrected by expressing the cytosolic MT and metal concentrations as the tissue content. Consequently, the changes of the average digestive gland mass coincide with the changes of MT and trace metal contents. From February to June, MT contents are nearly twice and trace metal contents nearly three times higher than those of the other months. The period of increased average digestive gland mass, of MT and trace metal contents probably overlaps with the sexual maturation of mussels (gametogenesis) and enhanced food availability. Since natural factors contribute more to the MT content than the sublethal levels of Cd, the digestive gland of M. galloprovincialis is not considered as a tissue of choice for estimating Cd exposure by means of MTs.