Valladolid-Garnica D E, Jara-Marini M E, Torres-Rojas Y E, Soto-Jiménez M F
Posgrado en Ciencias de Mar y Limnología, Universidad Nacional Autónoma de México, Av. Universidad 3000, Ciudad Universitaria Coyoacán, C.P. 04510, Ciudad de México, Mexico.
Centro de Investigación en Alimentación y Desarrollo, A.C. Unidad Hermosillo, Carretera Gustavo Astiazarán Rosas 46, Colonia La Victoria, Hermosillo, 83304, Sonora, Mexico.
Mar Pollut Bull. 2023 Sep;194(Pt A):115290. doi: 10.1016/j.marpolbul.2023.115290. Epub 2023 Jul 21.
Our understanding of the trophic transfer of pollutants in marine subtropical ecosystems remains limited due to the complexity of their food webs. Thus, we aimed to evaluate Cd, Cu, Mn, Pb, and Zn sources, incorporation, and trophodynamics throughout the food web of the southeastern Gulf of California by stomach content analysis, stable isotope analysis, isotope mixing models, and trace element analysis in biological and environmental matrices. The food web comprised three main trophic guilds (TG1, TG2, and TG3). The bioaccumulation of Cd and Zn from seawater was efficient (> 1000) in TG2 and TG3. Bioaccumulation factor from sediment (BSAF >1) evidenced of Cd in all trophic guilds. In addition, non-trophic Cd relationships were identified in the food web. Based on the trophic magnification factor (TMF), Mn and Pb showed biodilution (TMF = 0.38; TMF = 0.16), while Cu and Zn exhibited biomagnification (TMF = 2.08; TMF = 3.31).
由于海洋亚热带生态系统食物网的复杂性，我们对污染物在其中的营养转移的理解仍然有限。因此，我们旨在通过胃内容物分析、稳定同位素分析、同位素混合模型以及生物和环境基质中的微量元素分析，评估加利福尼亚湾东南部食物网中镉、铜、锰、铅和锌的来源、吸收情况及营养动力学。该食物网由三个主要营养类群（TG1、TG2和TG3）组成。TG2和TG3中从海水中生物累积镉和锌的效率很高（>1000）。所有营养类群中沉积物的生物累积因子（BSAF>1）证明了镉的存在。此外，在食物网中还发现了非营养性镉的关系。基于营养放大因子（TMF），锰和铅呈现生物稀释（TMF = 0.38；TMF = 0.16），而铜和锌则呈现生物放大（TMF = 2.08；TMF = 3.31）。
