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

详细信息    查看全文

• 作者：Anita H. Poulsen^a ; ¹ ; ^{ahpoulsen@ucdavis.edu} ; Peter F. Landrum^b ; ^{plandrumprof@charter.net} ; So Kawaguchi^c ; ^{so.kawaguchi@aad.gov.au} ; Susan M. Bengtson Nash^d ; ^{s.bengtsonnash@griffith.edu.au}
• 关键词：Euphausia superba ; Polar crustacean ; Persistent organic pollutant (POP) ; Critical body residue (CBR) ; Dietary uptake kinetics
• 刊名：Environmental Pollution
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：175
• 期：Complete
• 页码：92-99
• 全文大小：680 K

文摘

This study evaluated the dietary uptake kinetics and sublethal toxicity of p,p¡ä-dichlorodiphenyl dichloroethylene (p,p¡ä-DDE) in Antarctic krill. The uptake rate constant (characterised by the seawater volume stripped of contaminant sorbed to algae) of 200?¡À?0.32?mL?g^?1 wet weight?h^?1, average absorption efficiency of 86?¡À?13 % and very low elimination rate constant of 5?¡Á?10^?6?¡À?0.0031?h^?1 demonstrate the importance of feeding for p,p¡ä-DDE bioaccumulation in Antarctic krill. Faecal egestion of unabsorbed p,p¡ä-DDE of 8.1?¡À?2.7 % indicates that this pathway contributes considerably to p,p¡ä-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¡ä-DDE in the Southern Ocean.