Dietary exposure of Antarctic krill to p,p %26apos;-DDE: Uptake kinetics and toxicological sensitivity in a key polar species

作者：Poulsen Anita H^*; Landrum Peter F; Kawaguchi So; Nash Susan M Bengtson

来源：Environmental Pollution, 2013, 175: 92-99.

DOI：10.1016/j.envpol.2012.12.026

• Euphausia superba
• Polar crustacean
• Persistent organic pollutant (POP)
• Critical body residue (CBR)
• Dietary uptake kinetics

This study evaluated the dietary uptake kinetics and sublethal toxicity of p,p%26apos;-dichlorodiphenyl dichloroethylene (p,p%26apos;-DDE) in Antarctic krill. The uptake rate constant (characterised by the seawater volume stripped of contaminant sorbed to algae) of 200 +/- 032 mL g(-1) wet weight h(-1), average absorption efficiency of 86 +/- 13% and very low elimination rate constant of 5 x 10(-6) +/- 0.0031 h(-1) demonstrate the importance of feeding for p,p%26apos;-DDE bioaccumulation in Antarctic krill. Faecal egestion of unabsorbed p,p%26apos;-DDE of 8.1 +/- 2.7% indicates that this pathway contributes considerably to p,p%26apos;-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%26apos;-DDE in the Southern Ocean.

• 出版日期2013-4