Dietary exposure of Antarctic krill to p,p '-DDE: Uptake kinetics and toxicological sensitivity in a key polar species

Poulsen, Anita H., Landrum, Peter F., Kawaguchi, So and Nash, Susan M. Bengtson (2013) Dietary exposure of Antarctic krill to p,p '-DDE: Uptake kinetics and toxicological sensitivity in a key polar species. Environmental Pollution, 175 92-99. doi:10.1016/j.envpol.2012.12.026


Author Poulsen, Anita H.
Landrum, Peter F.
Kawaguchi, So
Nash, Susan M. Bengtson
Title Dietary exposure of Antarctic krill to p,p '-DDE: Uptake kinetics and toxicological sensitivity in a key polar species
Journal name Environmental Pollution   Check publisher's open access policy
ISSN 0269-7491
1873-6424
Publication date 2013-04
Sub-type Article (original research)
DOI 10.1016/j.envpol.2012.12.026
Volume 175
Start page 92
End page 99
Total pages 8
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2014
Language eng
Formatted abstract
This study evaluated the dietary uptake kinetics and sublethal toxicity of p,p′-dichlorodiphenyl dichloroethylene (p,p′-DDE) in Antarctic krill. The uptake rate constant (characterised by the seawater volume stripped of contaminant sorbed to algae) of 200 ± 0.32 mL g−1 wet weight h−1, average absorption efficiency of 86 ± 13% and very low elimination rate constant of 5 × 10−6 ± 0.0031 h−1 demonstrate the importance of feeding for p,p′-DDE bioaccumulation in Antarctic krill. Faecal egestion of unabsorbed p,p′-DDE of 8.1 ± 2.7% indicates that this pathway contributes considerably to p,p′-DDE sinking fluxes. A median internal effective concentration (IEC50) of 15 mmol/kg lipid weight for complete immobility indicates baseline toxicity and that Antarctic krill exhibit comparable toxicological sensitivity as temperate species under similar 10 d exposure conditions. These findings support the critical body residue approach and provide insight to the role of Antarctic krill in the biogeochemical cycling of p,p′-DDE in the Southern Ocean.
Keyword Euphausia superba
Polar crustacean
Persistent organic pollutant (POP)
Critical body residue (CBR)
Dietary uptake kinetics
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
National Research Centre for Environmental Toxicology Publications
 
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