Document Detail


Uptake and loss of dissolved 109Cd and 75Se in estuarine macroinvertebrates.
MedLine Citation:
PMID:  17182081     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Semaphore crabs (Heloecius cordiformis), soldier crabs (Mictyris platycheles), ghost shrimps (Trypaea australiensis), pygmy mussels (Xenostrobus securis), and polychaetes (Eunice sp.), key benthic prey items of predatory fish commonly found in estuaries throughout southeastern Australia, were exposed to dissolved (109)Cd and (75)Se for 385 h at 30 k Bq/l (uptake phase), followed by exposure to radionuclide-free water for 189 h (loss phase). The whole body uptake rates of (75)Se by pygmy mussels, semaphore crabs and soldier crabs were 1.9, 2.4 and 4.1 times higher than (109)Cd, respectively. There were no significant (P>0.05) differences between the uptake rates of (75)Se and (109)Cd for ghost shrimps and polychaetes. The uptake rates of (109)Cd and (75)Se were highest in pygmy mussels; about six times higher than in soldier crabs for (109)Cd and in polychaetes for (75)Se - the organisms with the lowest uptake rates. The loss rates of (109)Cd and (75)Se were highest in semaphore crabs; about four times higher than in polychaetes for (109)Cd and nine times higher than in ghost shrimps for (75)Se - the organisms with the lowest loss rates. The loss of (109)Cd and (75)Se in all organisms was best described by a two (i.e. short and a longer-lived) compartment model. In the short-lived, or rapidly exchanging, compartment, the biological half-lives of (75)Se (16-39 h) were about three times greater than those of (109)Cd (5-12h). In contrast, the biological half-lives of (109)Cd in the longer-lived, or slowly exchanging compartment(s), were typically greater (1370-5950 h) than those of (75)Se (161-1500 h). Semaphore crabs had the shortest biological half-lives of both radionuclides in the long-lived compartment, whereas polychaetes had the greatest biological half-life for (109)Cd (5950 h), and ghost shrimps had the greatest biological half-life for (75)Se (1500 h). This study provides the first reported data for the biological half-lives of Se in estuarine decapod crustaceans. Moreover, it emphasises the importance of determining metal(loid) accumulation and loss kinetics in keystone prey items, which consequently influences their trophic transfer potential to higher-order predators.
Authors:
Ralph Alquezar; Scott J Markich; John R Twining
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-12-19
Journal Detail:
Title:  Chemosphere     Volume:  67     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-02-05     Completed Date:  2007-06-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  1202-10     Citation Subset:  IM    
Affiliation:
Department of Environmental Sciences, University of Technology Sydney, P.O. Box 123 Broadway 2007, NSW, Australia. r.alquezar@cqu.edu.au <r.alquezar@cqu.edu.au>
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MeSH Terms
Descriptor/Qualifier:
Animals
Bivalvia
Brachyura
Cadmium Radioisotopes / metabolism*,  pharmacokinetics
Decapoda (Crustacea)
Half-Life
Polychaeta
Seawater
Selenium Radioisotopes / metabolism*,  pharmacokinetics
Solubility
Chemical
Reg. No./Substance:
0/Cadmium Radioisotopes; 0/Selenium Radioisotopes

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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