Ruelas-Inzunza J, Soto-Jiménez M F, Ruiz-Fernández A C, Ramos-Osuna M, Mones-Saucedo J, Páez-Osuna F
Instituto Tecnológico de Mazatlán, Calle Corsario 1, No. 203, Col. Urías, Mazatlán 82070, Sinaloa, Mexico.
Universidad Nacional Autónoma de México/Instituto de Ciencias del Mar y Limnología, Explanada de la Azada s/n, Mazatlán 82040, Sinaloa, Mexico.
Mar Pollut Bull. 2014 Oct 15;87(1-2):98-103. doi: 10.1016/j.marpolbul.2014.08.006. Epub 2014 Aug 22.
We measured Cd and Pb in the muscle and stomach contents of Thunnus albacares and Katsuwonus pelamis to define the distribution of the elements in the tissues and their degrees of biomagnification. (210)Po was measured in the livers of both species and compared to the results of similar studies. The trophic position of the tuna species was determined by N isotope measurements. The average activity of (210)Po in the liver ranged from 119 to 157 (Bq kg(-1) wet weight) in K. pelamis and T. albacares. The trophic position of T. albacares (4.60) was higher than that of K. pelamis (3.94). The Cd content of the muscle increased significantly with the trophic position of the tuna. δ(13)C in T. albacares and K. pelamis varied, with values of 3.13 and 1.88‰, respectively. The δ(15)N values in yellowfin tuna were higher than in skipjack tuna. The trophic position of T. albacares (4.60 ± 0.67) was therefore more elevated than that of K. pelamis (3.94 ± 1.06). Pb was biomagnified in T. albacares (transfer factor=1.46).
我们测量了黄鳍金枪鱼和鲣鱼肌肉及胃内容物中的镉和铅，以确定这些元素在组织中的分布及其生物放大程度。对这两个物种的肝脏进行了（210）钋的测量，并与类似研究的结果进行比较。通过氮同位素测量确定了金枪鱼物种的营养级。鲣鱼和黄鳍金枪鱼肝脏中（210）钋的平均活度范围为119至157（贝可勒尔·千克⁻¹湿重）。黄鳍金枪鱼的营养级（4.60）高于鲣鱼（3.94）。金枪鱼肌肉中的镉含量随着其营养级的升高而显著增加。黄鳍金枪鱼和鲣鱼的δ（13）C有所不同，分别为3.13‰和1.88‰。黄鳍金枪鱼的δ（15）N值高于鲣鱼。因此，黄鳍金枪鱼（4.60±0.67）的营养级比鲣鱼（3.94±1.06）更高。铅在黄鳍金枪鱼中发生了生物放大（转移因子 = 1.46）。
