Laboratorio de Análisis por Activación Neutrónica, Centro Atómico Bariloche, CNEA, Av. Bustillo km 9.5, 8400, Bariloche, Argentina.
Centro Científico Tecnológico CONICET Patagonia Norte, Bariloche, Argentina.
Environ Sci Pollut Res Int. 2018 Jun;25(16):15422-15435. doi: 10.1007/s11356-018-1725-8. Epub 2018 Mar 21.
Zinc (Zn) bioaccumulation and trophic transfer were analyzed in the food web of Lake Nahuel Huapi, a deep, unpolluted ultraoligotrophic system in North Patagonia. Benthic macroinvertebrates, plankton, and native and introduced fish were collected at three sites. The effect of pyroclastic inputs on Zn levels in lacustrine food webs was assessed by studying the impact of the eruption of Puyehue-Cordón Caulle volcanic complex (PCCVC) in 2011, by performing three sampling campaigns immediately before and after the PCCVC eruption, and after 2 years of recovery of the ecosystem. Zinc trophodynamics in L. Nahuel Huapi food web was assessed using nitrogen stable isotopes (δN). There was no significant increase of Zn concentrations ([Zn]) in L. Nahuel Huapi biota after the PCCVC eruption, despite the evidence of [Zn] increase in lake water that could be associated with volcanic ash leaching. The organisms studied exhibited [Zn] above the threshold level considered for dietary deficiency, regulating Zn adequately even under a catastrophic situations like PCCVC 2011 eruption. Zinc concentrations exhibited a biodilution pattern in the lake's food web. To the best of our knowledge, present research is the first report of Zn biodilution in lacustrine systems, and the first to study Zn transfer in a freshwater food web including both pelagic and benthic compartments.
锌（Zn）的生物积累和营养传递在纳韦尔瓦皮湖（Nahuel Huapi 湖）的食物网中进行了分析，该湖是北巴塔哥尼亚地区一个深、未受污染的超寡营养系统。在三个地点采集了底栖大型无脊椎动物、浮游生物以及本地和引入的鱼类。通过研究普耶韦火山群（Puyehue-Cordón Caulle volcanic complex，PCCVC）2011 年喷发对湖泊食物网中 Zn 水平的影响，评估了火山碎屑输入对 Zn 水平的影响，在 PCCVC 喷发前、后立即以及生态系统恢复 2 年后进行了三次采样。使用氮稳定同位素（δN）评估了 L. Nahuel Huapi 食物网中 Zn 的营养动力学。尽管湖水[Zn]增加的证据可能与火山灰浸出有关，但在 PCCVC 喷发后，L. Nahuel Huapi 生物群中 Zn 浓度（[Zn]）没有明显增加。研究的生物具有高于认为是饮食缺乏的[Zn]阈值水平，即使在像 PCCVC 2011 喷发这样的灾难性情况下，也能对 Zn 进行适当调节。Zn 浓度在湖泊食物网中表现出生物稀释模式。据我们所知，目前的研究是首次报道湖泊系统中 Zn 的生物稀释，也是首次研究包括浮游和底栖两个区室在内的淡水食物网中 Zn 的传递。
