Topic
Bioaccumulation
About: Bioaccumulation is a research topic. Over the lifetime, 7112 publications have been published within this topic receiving 208953 citations. The topic is also known as: bioakumulace.
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TL;DR: The results indicate that the higher Cd and Zn tissue concentrations observed in these two species may be partially caused by the high levels of metal assimilation, which may modify their physiological and biochemical responses to metal stress.
Abstract: The marine clams Mactra veneriformis were collected from three different locations in a contaminated bay in Northern China. Another species of clams Ruditapes philippinarum was collected from the same contaminated bay as well as from a relatively clean site in Hong Kong. The indices of Cd and Zn bioaccumulation (assimilation efficiency, dissolved uptake rate, and efflux rate), tissue concentration, subcellular distribution, metallothionein (MT) content, and clearance rate of the clams were subsequently quantified in these populations in the laboratory. In the two species of clams, the population with a higher Cd tissue concentration assimilated Cd and Zn more efficiently, in correlation with an increase in the Cd associated with the metallothionein-like protein (MTLP) fraction. The subcellular partitioning of Zn was similar among the different populations. The dissolved uptake rates of Cd and Zn were not influenced by the different tissue concentrations of metals in the clams. However, the clam R. philippinarum from the contaminated site reduced their Zn uptake rate constants in response to increasing Zn concentration in the water. Differences in Cd and Zn tissue concentrations had little influence on the metal efflux rate constant and the clams' clearance rate. Our results indicate that the higher Cd and Zn tissue concentrations observed in these two species may be partially caused by the high levels of metal assimilation. Populations living in contaminated environments may be able to modify their physiological and biochemical responses to metal stress, which can subsequently alter trace metal bioaccumulation to aquatic animals. The relative significance of dietary uptake and the potential trophic transfer of metals in the contaminated areas may be substantially different from those in the clean environments.
85 citations
TL;DR: Observed variations in flux rate may have been due to differences in food availability in the two experimental systems, and more rapid loss was noted from individuals which had absorbed the isotope directly from water than from those which had accumulated selenium via the food chain.
Abstract: The influence of certain environmental factors on the flux of selenium through marine biota has been studied, using Mytilus galloprovincialis and Lysmata seticaudata as test organisms of commercial interest. Over a selenium concentration range in sea water spanning 3 orders of magnitude, bioaccumulation of selenium by mussels was strongly dependent upon the ambient selenium concentration in sea water. Mussels accumulated Se (+4) to a much greater extent than Se (+6) and bioaccumulation was dependent upon temperature and mussel size. The presence of varying amounts of mercury did not significantly alter selenium uptake kinetics in mussels. Shrimp accumulated selenium to a lesser degree than mussels, the difference in concentration factors being due to the large amount of sorbed isotope lost with shrimp molts. Once incorporated, selenium was lost more rapidly from shrimp than from mussels. Temperature influenced selenium loss from mussels but did not alter the elimination rate in shrimp. Neither the chemical form of selenium nor mercury concentration in the organism affected loss of selenium from mussels. Elimination of selenium from shrimp was dependent upon the route of uptake; more rapid loss was noted from individuals which had absorbed the isotope directly from water than from those which had accumulated selenium via the food chain. In general, long-term selenium turnover rates were quite similar for both species; biological half-times ranged from 58 to 60 days for shrimp and 63 to 81 days for mussels. In the case of mussels, turnover rates measured in animals maintained in the laboratory differed somewhat from those determined from individuals held in field enclosures. Observed variations in flux rate may have been due to differences in food availability in the two experimental systems.
85 citations
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01 Jan 1983
TL;DR: A potential threat to human health may occur as a result of exposure to a higher heavy metal intake from drinking water provided in lead or copper plumbing, particularly from the bioaccumulation process in the aquatic food chain this paper.
Abstract: Potential threat to human health may occur as a result of
exposure to a higher heavy metal intake from drinking water provided in lead or copper plumbing;
exposure to a higher heavy metal intake particularly mercury and cadmium from the bioaccumulation process in the aquatic food chain.
84 citations
TL;DR: The elevated uptake rates and higher CFs for most radioisotopes indicate that S. canicula is more susceptible than P. maxima to exposure and contamination by these metals and radionuclides in seawater.
84 citations
TL;DR: A method based on QuEChERS extraction and subsequent liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis has been developed and validated for the determination of 52 medium to highly polar pesticides in fresh fish muscle, finding metolachlor and quinoxyfen were both the most ubiquitous and abundant pesticides.
84 citations