Dioxins and related compounds in albatrosses from the Torishima Island, Japan: Accumulation features by growth stage and toxicological implications

作者：Kunisue Tatsuya; Nakanishi Shigeyuki; Oka Nariko; Sato Fumio; Tsurmi Miyako; Tanabe Shinsuke^*

来源：Environmental Science & Technology, 2006, 40(22): 6919-6927.

DOI：10.1021/es061153a

Concentrations of dioxins and related compounds (DRCs), such as polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and coplanar polychlorinated biphenyls (Co-PCBs), were determined in eggs, nestlings, and adults of black-footed albatross (BfA; Diomedea nigripes) and short- tailed albatross (StA; Diomedea albatrus) collected from the Torishima Island in Japan during 2002, which is one of their breeding grounds. Observed DRC concentrations, especially PCDFs and non-ortho Co-PCBs, in eggs of BfA and StA were relatively higher than those in other oceanic, coastal, and inland wild birds reported recently and were comparable to those in a pooled BfA egg from Midway Atoll in 1993, implying continuous input of these contaminants into open ocean and possible albatross- specific exposure. Concentrations of PCDDs except 12378-P5CDD and high-chlorinated PCDFs in 3-month-old BfA nestling were lower than those in 1-month-old nestling, indicating their developmental dilution. On the other hand, higher levels of T-4-H(6)CDFs and Co-PCBs, especially low-chlorinated congeners such as 2378-T4CDF and T(4)CB77, were found in 3-month-old BfA nestling, suggesting specific exposure to these contaminants, possibly due to their higher transportability than high-chlorinated congeners. Estimated biomagnification factors of almost all the congeners in adults were apparently greater than those in nestlings, except 2378-T4CDF, T(4)CB77, and H-7-O8CDD/Fs. This could be due to preferential metabolism of 2378-T4CDF and T(4)CB77 and lower uptake efficiency of high-chlorinated congeners through the gastrointestinal tract in adults. Toxic equivalents in BfA and StA eggs estimated using WHO-avian toxic equivalency factors exceeded some toxicity thresholds for avian embryos, indicating possible adverse effects of DRCs to albatross embryos.

• 出版日期2006-11-15