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Two-Phase Uptake of Nickel in the Ground Beetle Pterostichus oblongopunctatus (Coleoptera: Carabidae): Implications for Invertebrate Metal Kinetics.
MedLine Citation:
PMID:  20686892     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
We studied nickel (Ni) kinetics in the ground beetle Pterostichus oblongopunctatus exposed to different, potentially stressful, temperatures. We found unexpected Ni kinetics in metal-exposed adult and larval beetles. Instead of the pattern observed commonly for other metals, i.e., an increase in metal concentration followed by stabilisation in the uptake phase and a decrease after transfer to uncontaminated food, the Ni-fed beetles apparently switched to decontamination soon after the start of Ni exposure while they were still being fed Ni-spiked food. In addition, internal body Ni concentrations showed high variance. The traditional first-order, one-compartment model with the switch to decontamination set to the last day of the uptake phase appeared inadequate and in most cases was nonsignificant. Instead, the model with a regression-estimated point of switching to decontamination fit the data better, explaining 57.2-91.5% of the temporal variability of mean Ni body concentrations (weighted regression) in adult beetles and 44.1-62.3% in larvae. Temperature did not affect Ni toxicokinetics in adults, but in larvae there were some temperature-dependent differences in kinetic parameters.
Authors:
Agnieszka J Bednarska; Anna Brzeska; Ryszard Laskowski
Publication Detail:
Type:  Journal Article     Date:  2010-08-05
Journal Detail:
Title:  Archives of environmental contamination and toxicology     Volume:  60     ISSN:  1432-0703     ISO Abbreviation:  Arch. Environ. Contam. Toxicol.     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-07-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0357245     Medline TA:  Arch Environ Contam Toxicol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  722-33     Citation Subset:  IM    
Affiliation:
Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland, a.bednarska@uj.edu.pl.
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