Endo Tetsuya, Kimura Osamu, Ohta Chiho, Koga Nobuyuki, Kato Yoshihisa, Fujii Yukiko, Haraguchi Koichi
School of Pharmaceutical Sciences, Health Sciences University of Hokkaido, 1757 Kanazawa, Ishikari-Tobetsu, Hokkaido 061-0293, Japan.
Faculty of Nutritional Sciences, Nakamura Gakuen University, 5-7-1 Befu, Jonan-Ku, Fukuoka 814-0198, Japan.
PLoS One. 2016 Feb 9;11(2):e0147797. doi: 10.1371/journal.pone.0147797. eCollection 2016.
We analyzed Hg, Cd, Zn, Cu and Fe concentrations in liver samples as well as the Hg concentration and stable isotope ratios of carbon and nitrogen (δ13C and δ15N) in muscle samples from silvertip sharks (Carcharhinus albimarginatus) in Japan. Muscular and hepatic Hg concentrations increased with increased body length. However, these increases were more prominent in the liver than in the muscle samples, and appeared to occur after maturation. Hepatic Zn and Cu concentrations decreased during the growth stage, and then increased concomitantly thereafter with increases in Cd burden. Hepatic Fe concentration from males increased proportionally with increases in body length, whereas no increase was observed in samples from females, probably due to the mother-to-embryo transfer of Fe. The δ13C values tended to decrease with increases in body length, whereas no decrease in the δ15N values was observed.
我们分析了日本银鳍鲨（白边真鲨）肝脏样本中的汞、镉、锌、铜和铁浓度，以及肌肉样本中的汞浓度和碳、氮稳定同位素比率（δ13C和δ15N）。肌肉和肝脏中的汞浓度随体长增加而升高。然而，这种升高在肝脏中比在肌肉样本中更为显著，且似乎在成熟后才出现。肝脏中的锌和铜浓度在生长阶段下降，随后随着镉负荷的增加而同步上升。雄性肝脏中的铁浓度随体长增加而成比例增加，而雌性样本中未观察到增加，这可能是由于铁从母体向胚胎的转移。δ13C值倾向于随体长增加而降低，而δ15N值未观察到下降。
