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Specific accumulation of arsenic compounds in green turtles (Chelonia mydas) and hawksbill turtles (Eretmochelys imbricata) from Ishigaki Island, Japan
Authors:Agusa Tetsuro  Takagi Kozue  Kubota Reiji  Anan Yasumi  Iwata Hisato  Tanabe Shinsuke
Institution:Center for Marine Environmental Studies (CMES), Ehime University, Matsuyama, Japan.
Abstract:Concentrations of total arsenic (As) and individual compounds were determined in green and hawksbill turtles from Ishigaki Island, Japan. In both species, total As concentrations were highest in muscle among the tissues. Arsenobetaine was a major compound in most tissues of both turtles. High concentrations of trimethylarsine oxide were detected in hawksbill turtles. A significant negative correlation between standard carapace length (SCL), an indicator of age, and total As levels in green turtles was found. In contrast, the levels increased with SCL of hawksbill turtles. Shifts in feeding habitats with growth may account for such a growth-dependent accumulation of As. Although concentrations of As in marine sponges, the major food of hawksbill turtles are not high compared to those in algae eaten by green turtles, As concentrations in hawksbill turtles were higher than those in green turtles, indicating that hawksbill turtles may have a specific accumulation mechanism for As.
Keywords:Arsenic  Arsenic compounds  Hawksbill turtle  Green turtle  Muscle  Size-dependent accumulation
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