title: Seasonal variation in lysosomal destabilization in oysters, Crassostrea virginica.
abstract: Lysosomal destabilization assays have been used as valuable biomarkers of pollutant exposures in a variety of bivalve and fish species. The responses of oysters, Crassostrea virginica, deployed at and native to various reference and degraded sites were evaluated for lysosomal destabilization during both summer and winter seasons. In both native and deployed oysters, lysosomal destabilization rates tended to be higher during the winter at both reference and polluted sites. There are at least two hypothetical explanations. Greater lysosomal destabilization rates may be related to physiological changes associated with mobilization of nutrient reserves during the winter and gametogenesis. However, lysosomal destabilization in deployed oysters was correlated with tissue metal concentrations. These data also support a second hypothesis that seasonal differences in physico-chemical factors (such as reduced levels of acid volatile sulfides) may increase the bioavailability of metals during the winter so that adverse effects are more pronounced.
authors.affiliation: Marine Resources Research Institute, SC Department of Natural Resources, Charleston 29412, USA. ringwooda@mrd.dnr.state.sc.us
authors.forename: Amy H
authors.initials: AH
authors.lastname: Ringwood
authors.forename: Jennifer
authors.initials: J
authors.lastname: Hoguet
authors.forename: Charles J
authors.initials: CJ
authors.lastname: Keppler
mesh_terms: D000818:Animals; D001681:Biological Assay / Q000379:methods; D001682:Biological Availability; D008247:Lysosomes / Q000473:pathology*; D019216:Metals, Heavy / Q000009:adverse effects*; D010125:Ostreidae / Q000502:physiology*; D015203:Reproducibility of Results; D012621:Seasons; D013440:Sulfides; D014873:Water Pollutants / Q000009:adverse effects
chemical_list: D019216:Metals, Heavy; D013440:Sulfides; D014873:Water Pollutants