Portal de Periódicos da CAPES

Accumulation of Butyltin Compounds in Risso's Dolphin ( Grampus griseus ) from the Pacific Coast of Japan: Comparison with Organochlorine Residue Pattern

1996; American Chemical Society; Volume: 30; Issue: 8 Linguagem: Inglês

10.1021/es9600486

1520-5851

G. B. Kim, Shinsuke Tanabe, R. Iwakiri, Ryo Tatsukawa, Masao Amano, Nobuyuki Miyazaki, Hiroyuki Tanaka,

Environmental Toxicology and Ecotoxicology

Concentrations of butyltins (BTs) in the liver and organochlorine compounds (OCs) in the blubber of Risso's dolphins collected off Taiji, Japan, in 1991 were determined. Mean and range concentrations (wet weight basis) of these compounds were 3.6 μg/g (0.55−6.0 μg/g) for BTs, 25 μg/g (1.7−120 μg/g) for PCBs, 17 μg/g (0.45−77 μg/g) for DDTs, 4.0 μg/g (0.19−16 μg/g) for CHLs, and 0.16 μg/g (0.008−0.74 μg/g) for HCHs. OCs concentrations increased with age in males in contrast to that in females, which showed a decreasing trend after maturity. On the other hand, no difference was observed in BT concentrations between male and female, which showed increasing levels until maturity (8−10 years) and then remained constant. It is suggested that, unlike OCs, BTs were less transferable to young ones in reproductive processes. Risso's dolphins showed higher biomagnification factor (about 6) than Steller sea lion (0.6), implying a slower excretion rate of BTs in cetaceans than in pinnipeds due to the lower degradation capacity of xenobiotics and the lack of physiological processes such as shedding of hair in cetaceans.