ICYTAC, Instituto de Ciencia y Tecnología de Alimentos Córdoba, CONICET and Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Bv. Dr. Juan Filloy s/n, Ciudad Universitaria, 5000 Córdoba, Argentina.
BLT Wieselburg, HBLFA Francisco-Josephinum, Rottenhauserstrasse, 1, 3250 Wieselburg, Austria; Institute of Lithospheric Research, Vienna University, Althanstr. 14, 1090 Vienna, Austria.
Ecotoxicol Environ Saf. 2018 Feb;148:275-284. doi: 10.1016/j.ecoenv.2017.10.028. Epub 2017 Nov 6.
The concentration of metals (Al, Cr, Mn, Fe, Ni, Cu, Zn, Ag, Cd, Hg, Pb, U), As and Se in different ecosystem components (water, sediment, plankton, shrimp, and fish muscle) has been determined in a eutrophic reservoir in the Province of Córdoba (Argentina). Los Molinos Lake (LML) was sampled during the dry (DS) and wet seasons (WS) in order to examine the bioaccumulation and transfer of these inorganic elements through the food web. Stable nitrogen isotope (δN) was used to investigate trophic interactions. According to this, samples were divided into three categories: plankton, shrimp (Palaemonetes argentinus) and fish (Silverside, Odontesthes bonariensis). The bioaccumulation factor (BAF) was calculated for the organisms, and it was determined that the elements analyzed undergo bioaccumulation, especially in organisms such as plankton. The invertebrates were characterized by the highest BAF for Cu and Zn in both seasons, As (DS), and Cd and Hg (WS). The fish muscle was characterized by the highest BAF for Se (WS), Ag and Hg (DS). On the other hand, a significant decrease in Al, Cr, Mn, Fe, Ni, Cu, Zn, As, Se, Cd and U concentrations through the analyzed trophic web during both seasons was observed. Moreover, a significant increase in Hg levels was observed with increasing trophic levels in the DS, indicating its biomagnification. Despite the increasing impact of metals, As and Se pollution in the studied area due to urban growth and agricultural and livestock activities, no previous study has focused on the behavior and relationships of these pollutants with the biotic and abiotic components of this aquatic reservoir. We expect that these findings may be used for providing directions or guidance for future monitoring and environmental protection policies.
在阿根廷科尔多瓦省的一个富营养化水库中,测定了不同生态系统成分(水、沉积物、浮游生物、虾和鱼肉)中的金属(Al、Cr、Mn、Fe、Ni、Cu、Zn、Ag、Cd、Hg、Pb、U)、As 和 Se 的浓度。为了研究这些无机元素通过食物网的生物积累和转移,在旱季(DS)和雨季(WS)对洛斯莫利诺斯湖(LML)进行了采样。稳定氮同位素(δN)用于研究营养相互作用。根据这一点,将样本分为三类:浮游生物、虾(Palaemonetes argentinus)和鱼(Silverside,Odontesthes bonariensis)。为生物体计算了生物积累因子(BAF),结果表明,所分析的元素会发生生物积累,特别是在浮游生物等生物体中。在两个季节中,无脊椎动物的 Cu 和 Zn 的 BAF 最高,As(DS),Cd 和 Hg(WS)。鱼肌肉的 BAF 最高,Se(WS),Ag 和 Hg(DS)。另一方面,在两个季节的分析食物链中,Al、Cr、Mn、Fe、Ni、Cu、Zn、As、Se、Cd 和 U 的浓度都显著降低。此外,在 DS 中,Hg 水平随着营养水平的增加而显著增加,表明其生物放大作用。尽管由于城市发展以及农业和畜牧业活动,研究区域的金属、As 和 Se 污染的影响越来越大,但以前的研究并未关注这些污染物与该水生水库的生物和非生物成分的行为和关系。我们希望这些发现可以为未来的监测和环境保护政策提供指导方向。