沖縄島北部やんばる地域の生態系における水銀分布と他元素との関係

概要

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Relatively high levels of Hg were found in the bodies of low tropic animals inhabiting Yambaru area when compared with unpolluted ecosystems. Especially, large centipede species which are the strong carnivore of invertebrates accumulated Hg with high concentration due to their high tropic in food web. In the same way, some species of raptors and carnivorous snake inhabiting forest accumulated Hg in their bodies. These facts supported that biomagnification of Hg exists in the ecosystem of Yambaru area. Interestingly, rare animals in the Yambaru area such as Anderson's crocodile newt as amphibians, Okinawa woodpecker, Ryukyu robin, and Okinawa rail as birds accumulated Hg with higher levels when compared with other animals niching at the same tropic levels. From analysis of inter-elemental relationships using concentration data of 25 trace elements in the animal bodies collected from Yambaru area, three toxic elements (lead, cadmium, and silver), five essential elements (selenium, chromium, vanadium, nickel, and cobalt), and one trace element (strontium) were correlated with Hg in the various animal groups such as invertebrate, amphibians, reptilian, omnivorous birds, carnivorous birds, omnivorous mammals, and carnivorous mammals.
2011-03-25