Distribution, biomagnification, and elimination of butyltin compound residues in common cormorants (Phalacrocorax carbo) from Lake Biwa, Japan.
ABSTRACT Concentrations of butyltin compounds (BTs) were determined in various body tissues of common cormorants (Phalacrocorax carbo) collected from the Lake Biwa, Japan. Elevated concentrations of butyltins were detected in the feathers of cormorants. Among other organs and tissues, butyltin levels were also higher in the kidney (290+/-150 ng/g) and liver (270+/-260 ng/g), ranging from 115 to 544 ng/g and 142 to 1007 ng/g (wet wt basis), respectively. The accumulation of BTs in cormorant bodies was in the order of MBT>DBT>TBT and their organ specific burdens were in the order of muscle>/=feathers>skin>liver>rest of the tissues and organs. The higher levels of BTs residues in feather suggested the excretion of about one fourth of their body burden during a complete molting cycle, which has been a natural detoxification mechanism in these birds. Based on the whole body concentrations of BTs in cormorants (42-160 ng/g wet wt) and fish (10-55 ng/g wet wt) biomagnification factors were assessed to be in the range of 1.1-4.1. To our knowledge, this is the first fundamental study to substantially indicate the contamination and kinetics of BTs in wild birds.
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ABSTRACT: Concentrations of butyltin compounds were determined in the kidney and liver of various seabirds collected from Japan, Korea, the North Pacific Ocean and the southern Indian Ocean. These compounds were detected in most of the samples, which indicated widespread contamination in higher trophic aquatic animals even in remote areas. The highest mean residue concentrations of butyltins in the kidney (300 ng/g wet wt) and liver (280 ng/g wet wt) were in common cormorants from Lake Biwa, Japan. Laysan albatross from the North Pacific Ocean accumulated higher butyltin residues in the liver (43 ng/g wet wt) among open-ocean birds. Even though the number of samples analysed was small, it can be suggested that birds inhabiting inland to coastal areas had higher exposure to butyltins than those in the ocean. To our knowledge, this is the first study reporting on butyltin pollution in seabirds in global terms.Marine Environmental Research 08/1997; 44(2):191-199. · 2.34 Impact Factor