Instituto Politécnico Nacional (IPN), Centro Interdisciplinario de Ciencias Marinas (CICIMAR), Avenida IPN, s/n Colonia Playa Palo de Santa Rita, 23096 La Paz, Baja California Sur, Mexico.
Instituto Politécnico Nacional (IPN), Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD), Calle 30 de Junio de 1520, Barrio la Laguna Ticomán, 07340 Ciudad de México, Mexico.
Mar Pollut Bull. 2020 Apr;153:111011. doi: 10.1016/j.marpolbul.2020.111011. Epub 2020 Feb 27.
Mercury- Selenium concentrations were determined in 136 samples of Carcharhinus falciformis (Silky shark) sampled from the Chiapas coast, Gulf of Tehuantepec, Mexico during August 2014 - January 2015. Average Hg concentrations in neonates and juveniles (all values in μg g w.w.) were found to be 0.115 and 0.129 respectively, below the maximum permissible limit of 1 μg g set by the Mexican government. However, excess Se values (all values in μg g d.w.) observed in neonates (5.366) and juveniles (2.815) prove to maintain antioxidant ability by inducing Hg excretion and reducing its toxicity. Calculated Biomagnification Factor (BMF) denoted high values for the prey C.hippurus, signifying absolute magnification of Hg and Se along the food chain. This study provides key toxicological evidences of Hg- Se interaction and their effects in marine systems and human health.
2014 年 8 月至 2015 年 1 月期间，在墨西哥塔毛利帕斯湾的恰帕斯海岸采集了 136 条镰状真鲨（Silky shark）样本，测定了其体内的汞-硒浓度。结果发现，幼鲨和亚成体的平均汞浓度（所有值均以μg g w.w.表示）分别为 0.115 和 0.129，低于墨西哥政府规定的 1μg g 的最大允许限值。然而，在幼鲨（5.366μg g d.w.）和亚成体（2.815μg g d.w.）中观察到的过量硒值表明，通过诱导汞排泄和降低其毒性，维持了抗氧化能力。计算得出的生物放大因子（BMF）表示，作为猎物的 C. hippurus 具有很高的数值，这意味着汞和硒在食物链中呈绝对放大状态。本研究为海洋系统和人类健康中汞-硒相互作用及其影响提供了关键的毒理学证据。
