Contrasting accumulation biokinetics and distribution of ²⁴¹Am, Co, Cs, Mn and Zn during the whole development time of the eggs of the common cuttlefish, Sepia officinalis

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• 作者：Thomas Lacoue-Labarthe ; Michel Warnau ; Franç ; ois Oberhä ; nsli ; Jean-Louis Teyssié ; Paco Bustamante
• 关键词：Bioaccumulation ; Eggshell ; Embryo ; Metals ; Permeability ; Radionuclide
• 刊名：Journal of Experimental Marine Biology and Ecology
• 出版年：2010
• 出版时间：1 January 2010
• 年：2010
• 卷：382
• 期：2
• 页码：131-138
• 全文大小：300 K

文摘

Cuttlefish eggs were exposed to ²⁴¹Am, Co, Cs, Mn and Zn for different periods of time during the 50-d of the embryonic development at 17 °C. Exposures were carried out using background dissolved concentrations of the metals, using the corresponding γ-emitting radiotracers (²⁴¹Am, ⁵⁷Co, ¹³⁴Cs, ⁵⁴Mn and ⁶⁵Zn). Eggs were then placed in non-contaminating conditions. Experiments allowed assessing 1) the uptake and depuration kinetics of the selected elements and 2) their distribution among the different egg compartments (i.e. eggshell, vitellus, peri-vitelline fluid and embryo). ²⁴¹Am, Co and Zn were accumulated continuously by the eggs all along the development time, whereas Mn reached saturation after one month of exposure. Interestingly, the uptake kinetics of Cs tightly followed the weight variation of the eggs, mainly because of water influx/outflux. During the first month of the embryonic life, ²⁴¹Am, Co, Cs, Mn and Zn remained associated with the eggshell, indicating that the latter acted as an efficient shield against their penetration. Nevertheless, from this time onwards, Co, Cs, Mn and Zn accumulated more or less efficiently in the embryo according to the following order: Cs > Zn > Mn > Co. ²⁴¹Am was the only element tested that did not cross the eggshell all along the exposure time. The depuration kinetics revealed that the retention capacity of the eggs varied during the embryonic life. The contrasting accumulation biokinetics are discussed in terms of chemical and biological processes occurring during the cuttlefish egg development.