Escuela de Ingeniería en Medioambiente, Facultad de Ingeniería, Centro de Investigación y Gestión de Recursos Naturales (CIGREN), Universidad de Valparaíso, General Cruz N° 222, Valparaíso, Chile.
Escuela de Ingeniería en Medioambiente, Facultad de Ingeniería, Centro de Investigación y Gestión de Recursos Naturales (CIGREN), Universidad de Valparaíso, General Cruz N° 222, Valparaíso, Chile.
Ecotoxicol Environ Saf. 2017 Nov;145:653-658. doi: 10.1016/j.ecoenv.2017.07.073. Epub 2017 Aug 17.
The estuaries of the Aconcagua and Maipo Rivers of central Chile are receptors of residues that contain metals from anthropic activities including agriculture, mining and smelters, which have different levels in the two basins. This study postulates that the exposition to metals is different in the two estuaries and that their sediments contain bioavailable chemical agents that produce oxidative stress. The aim of the study was to evaluate the effect of estuarine sediments on the polychaete Perinereis gualpensis using oxidative stress biomarkers and to determine the metal concentrations in sediments and their accumulation in P. gualpensis. Sediments and organisms were collected in December 2015 and January 2016 in the estuaries. The Catapilco estuary was used as control, since its basin has little anthropic activity. The metal concentrations of Fe Cu, Pb, Zn and Cd were determined in tissues of the organisms and in sediments. The granulometry, conductivity, redox potential, pH and organic matter in sediments were determined, as well as catalase activity and lipid peroxidation. The results show that the concentrations of metals in sediments were higher in the estuary of the Aconcagua River: Cu: 48 ± 2μgg; Fe: 154 ± 19mgg, Pb: 20 ± 3μgg and Zn: 143 ± 20μgg. In tissues, Pb and Fe were higher in the estuary of the Maipo River, while Cd was detected only in the Catapilco River mouth. Catalase activity was greater in the estuary of the Aconcagua River and lipid peroxidation in the estuary of the Catapilco River. Significant regressions were found between biomarkers of oxidative stress and metal concentrations in tissues of P. gualpensis. In conclusion, the sediments of the studied estuaries contain bioavailable chemical agents that provoke oxidative stress in P. gualpensis, which may be a risk for the benthic communities of these ecosystems. This species is proposed to monitor metals bioavailability and oxidative stress in estuarine sediments.
智利中部的 Aconcagua 和 Maipo 河流的河口是含有金属的残留物的受体，这些金属残留物来自农业、采矿和冶炼等人为活动，在这两个流域中的含量水平不同。本研究假设这两个河口的金属暴露情况不同，并且它们的沉积物中含有生物可利用的化学物质，这些物质会产生氧化应激。本研究的目的是使用氧化应激生物标志物评估河口沉积物对多毛类环节动物 Perinereis gualpensis 的影响，并确定沉积物中的金属浓度及其在 P. gualpensis 中的积累。沉积物和生物体于 2015 年 12 月至 2016 年 1 月在河口处采集。Catapilco 河口被用作对照，因为其流域人为活动较少。生物体组织和沉积物中的 Fe、Cu、Pb、Zn 和 Cd 浓度进行了测定。还测定了沉积物的粒度、电导率、氧化还原电位、pH 值和有机物含量，以及过氧化氢酶活性和脂质过氧化作用。结果表明，Aconcagua 河河口的沉积物中金属浓度更高：Cu：48 ± 2μg/g；Fe：154 ± 19mg/g；Pb：20 ± 3μg/g；Zn：143 ± 20μg/g。在组织中，Maipo 河河口的 Pb 和 Fe 浓度较高，而 Cd 仅在 Catapilco 河口处检测到。Aconcagua 河河口的过氧化氢酶活性较高，而 Catapilco 河河口的脂质过氧化作用较高。在 P. gualpensis 组织中，氧化应激生物标志物与金属浓度之间存在显著的回归关系。综上所述，研究中河口的沉积物含有生物可利用的化学物质，会在 P. gualpensis 中引发氧化应激，这可能对这些生态系统的底栖生物群落构成风险。建议该物种用于监测河口沉积物中金属的生物利用度和氧化应激。
