Szteren Diana, Aurioles-Gamboa David, Campos-Villegas Lorena Elizabeth, Alava Juan José
Laboratorio de Zoología Vertebrados, Departamento de Ecología y Evolución, Facultad de Ciencias, Iguá 4225, Montevideo 11400, Uruguay.
Laboratorio de Ecología de Pinnípedos "Burney J. Le Boeuf", Centro Interdisciplinario de Ciencias Marinas (CICIMAR), Instituto Politécnico Nacional (IPN), Avenida IPN, s/n Colonia Playa Polo de Santa Rita, C.P. 23096 La Paz, Baja California Sur, Mexico.
Mar Pollut Bull. 2023 Sep;194(Pt A):115263. doi: 10.1016/j.marpolbul.2023.115263. Epub 2023 Jul 27.
Trace metals concentrations along with stable isotopes ratios were measured in marine algae, sea grass, sponges, echinoderms, mollusks, crustaceans, fishes, and the California sea lion, to assess the bioaccumulation potential and detect potential risks for top predators off Bahia Magdalena, Mexico. We assessed the trophic magnification factor (TMF) to determine the potential for biomagnification of 11 trace metals. The concentrations of Fe and Zn were one order of magnitude higher than all other metals. Concentrations of As, Cu, Cd, Co, Cr, Fe, Mn and Ni correlated negatively with trophic level, supporting trophic dilution (TMF < 1, p > 0.05), while Zn and Hg had significant trophic magnification (TMF > 1, p < 0.05) when assessing only the benthic-pelagic foodweb. This research provides a baseline concentration of metals in multiple species, metal-specific foodweb bioaccumulation and biomagnification of mercury, underscoring the key role of the macrobenthic community as biovectors for trophic transfer of Hg through the foodweb to the California sea lion.
对海藻、海草、海绵、棘皮动物、软体动物、甲壳类动物、鱼类以及加利福尼亚海狮中的痕量金属浓度和稳定同位素比率进行了测量，以评估墨西哥马格达莱纳湾顶级捕食者的生物累积潜力并检测潜在风险。我们评估了营养放大因子（TMF），以确定11种痕量金属的生物放大潜力。铁和锌的浓度比所有其他金属高一个数量级。砷、铜、镉、钴、铬、铁、锰和镍的浓度与营养级呈负相关，支持营养稀释（TMF < 1，p > 0.05），而在仅评估底栖 - 浮游食物网时，锌和汞具有显著的营养放大作用（TMF > 1，p < 0.05）。本研究提供了多种物种中金属的基线浓度、特定金属的食物网生物累积以及汞的生物放大情况，强调了大型底栖生物群落作为汞通过食物网向加利福尼亚海狮进行营养转移的生物载体的关键作用。
