Comparative bioaccumulation kinetics of trace elements in Mediterranean marine sponges
Comparative bioaccumulation kinetics of trace elements in Mediterranean marine sponges
复制标题
DOI：
10.1016/j.chemosphere.2012.04.052
复制
发表时间：
2012-09-01
期刊：
影响因子：
8.8
通讯作者：
Lacoue-Labarthe, Thomas
中科院分区：
文献类型：
--
作者：
Genta-Jouve, Gregory;Cachet, Nadja;Lacoue-Labarthe, Thomas
虽然双壳类、海草和大型藻类等海洋生物通常被用作环境污染评估的生物监测器，但广泛分布的海绵作为监测方案的潜在有用物种却很少受到关注。本研究采用放射性示踪技术，通过物种比较研究，估算了几种海绵对微量元素和放射性核素的生物富集和滞留能力。六个地中海物种暴露于背景溶解浓度的Ag-110 m，Am-241，Cd-109，Co-60。Cs-134、Mn-54、Se-75、Zn-65，允许评估所选元素的吸收和净化动力学。在全球范围内，巨大的demosponges Agelas oroides，Chondrosia reniformis和Ircinia variabilis显示出更高的浓缩系数（CF）比勃起的（Acutella，Cymbaxinella damicornis，Cymbaxinella verrucosa）在曝光结束时，表明形态是金属生物富集效率的关键因素。考虑到这一观察，注意到两个例外：（1）A。当置于净化条件和（2）C时，acuta对Ag-110 m达到最高CF，并强烈保留累积的金属，而没有显着的Ag损失。肾形藻对Se的积累量低于A. oroides和I.变异性。这些结果表明，海绵中特有的金属吸收特性可能分别由特定的代谢物或物种之间的对比生物硅化过程驱动。这项研究表明，海绵可以被认为是有价值的候选生物监测金属污染，但也有必要在实验上突出物种之间的金属依赖特性。(C)2012爱思唯尔有限公司保留所有权利。
While marine organisms such as bivalves, seagrasses and macroalgae are commonly used as biomonitors for the environment pollution assessment, widely distributed sponges received little attention as potential helpful species for monitoring programmes. In this study, the trace element and radionuclide bioaccumulation and retention capacities of some marine sponges were estimated in a species-comparative study using radiotracers technique. Six Mediterranean species were exposed to background dissolved concentrations of Ag-110m, Am-241, Cd-109, Co-60. Cs-134, Mn-54, Se-75, Zn-65 allowing the assessment of the uptake and depuration kinetics for selected elements. Globally, massive demosponges Agelas oroides, Chondrosia reniformis and Ircinia variabilis displayed higher concentration factor (CF) than the erectile ones (Acanthella acuta, Cymbaxinella damicornis, Cymbaxinella verrucosa) at the end of exposure, suggesting that the morphology is a key factor in the metal bioaccumulation efficiency. Considering this observation, two exceptions were noted: (1) A. acuta reached the highest CF for Ag-110m and strongly retained the accumulated metal without significant Ag loss when placed in depuration conditions and (2) C. reniformis did not accumulate Se as much as A. oroides and I. variabilis. These results suggest that peculiar metal uptake properties in sponges could be driven by specific metabolites or contrasting biosilification processes between species, respectively. This study demonstrated that sponges could be considered as valuable candidate for biomonitoring metal contamination but also that there is a need to experimentally highlight metal-dependant characteristic among species. (C) 2012 Elsevier Ltd. All rights reserved.