Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Av. Ciudad Universitaria 3000, C.P. 04510, Coyoacán, Ciudad de México, Mexico.
Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Av. IPN S/N Col. Playa de Santa Rita, C.P. 23096, La Paz, Baja California Sur, Mexico.
Biol Trace Elem Res. 2020 May;195(1):215-225. doi: 10.1007/s12011-019-01832-1. Epub 2019 Jul 22.
We report cadmium (Cd) concentrations in muscle, liver, and blood of striped marlin (Kajikia audax) and blue marlin (Makaira nigricans), caught in the southwest of the Gulf of California. The average Cd concentration was higher in the liver followed by blood and muscle in descending order. This pattern of Cd concentration may be related to the differences in the physiological function of these tissues. In K. audax, the Cd concentration in muscle and liver increased proportionally with body size, but only in animals that have reached the body size corresponding to first sexual maturity (animals exceeding 155 cm of postorbital length). Interspecific differences in dietary composition and Cd content evidenced that food preferences have a significant effect on the bioaccumulation of Cd. No evidence of Cd biomagnification (progressive bioaccumulation of an element along the food web) was found, as the correlation between logarithmic Cd concentrations and δN values was not significant when both billfish and their prey items were included in the calculations. Furthermore, the calculated biotransference factor (transfer of an element from food to consumer) suggested that Cd transference is interrupted from prey to marlins.
我们报告了在加利福尼亚湾西南部捕获的条纹马林鱼（Kajikia audax）和蓝马林鱼（Makaira nigricans）肌肉、肝脏和血液中的镉（Cd）浓度。Cd 浓度在肝脏中最高，其次是血液，然后是肌肉，呈递减顺序。这种 Cd 浓度模式可能与这些组织的生理功能差异有关。在 K. audax 中，肌肉和肝脏中的 Cd 浓度与体型成正比增加，但仅在达到第一次性成熟对应的体型的动物中（超过眶后长 155 厘米的动物）。饮食组成和 Cd 含量的种间差异表明，食物偏好对 Cd 的生物积累有显著影响。由于当将箭鱼及其猎物都包括在计算中时，对数 Cd 浓度与 δN 值之间的相关性不显著，因此没有发现 Cd 生物放大（沿食物网的元素逐渐积累）的证据。此外，计算得出的生物转移因子（元素从食物转移到消费者的转移）表明，Cd 的转移从猎物到马林鱼被中断。
