Castiglioni Delfina, Rezende Carlos Eduardo, Muniz Pablo, Muir Alexander I, García-Alonso Javier
Ecología Teórica y Aplicada, Centro Universitario Regional Este, Universidad de la República, Maldonado, 20000, Uruguay.
Centro de Biociências e Biotecnologia, Laboratório de Ciências Ambientais, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, Rio de Janeiro, Brazil.
Bull Environ Contam Toxicol. 2018 Apr;100(4):472-476. doi: 10.1007/s00128-018-2301-0. Epub 2018 Feb 27.
Polychaetes that inhabit the sediments of estuaries are important prey to many species all around the world. Laeonereis acuta is a deposit feeder living in estuaries along the Atlantic coast of South America. Ragworms accumulate metals from the sediment, and represent a means of entry of sediment contaminants into the trophic network. The concentrations of Zn, Pb, Cu, Cr and Cd were determined in polychaetes and sediments (total and extractable) from six estuarine beaches of Río de la Plata. The associations between total and extractable concentrations in sediment and accumulated concentrations in L. acuta were analyzed. Sediments extracted by weak acid digestion appear to be a good proxy model of bioavailable metal fractions in the sediment. The association between metals in sediment and polychaetes denotes the role of L. acuta as an important link in metal trophic transfer from sediments to potential fish and bird predators of the worm.
栖息在河口沉积物中的多毛类动物是全球许多物种的重要猎物。尖叶拟沙蚕是一种生活在南美洲大西洋沿岸河口的沉积食性动物。沙蚕会从沉积物中积累金属，是沉积物污染物进入营养网络的一种途径。对拉普拉塔河六个河口海滩的多毛类动物和沉积物（总量和可提取量）中的锌、铅、铜、铬和镉浓度进行了测定。分析了沉积物中总量和可提取量与尖叶拟沙蚕中积累浓度之间的关联。通过弱酸消解提取的沉积物似乎是沉积物中生物可利用金属部分的良好替代模型。沉积物和多毛类动物中金属之间的关联表明尖叶拟沙蚕作为金属从沉积物向该蠕虫潜在的鱼类和鸟类捕食者进行营养转移的重要环节所起的作用。
