アオウミガメのIrによる長期標識〔英文〕

概要

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By neutron activation analysis (NAA), the Ir content of scutes and bone was determined in hatchlings over a 1, 550 day period, following feeding with 100-200mg Ir per capita with a 2000 ppm diet for 14 days. In the specimen of No. 198 Ir ranged from 0.48 to 167 ppb in 46 bone fragments on day 1, 110, in which the highest Ir occurred in the portion with the slowest growth (target), located in the middle of peripheral bone, under the scute junction, near the margin on the ventral side. After 30 years Ir remains at about a 0.7 ppb level, this determined by the regression line between Ir content and time, calculated from 90 results. To discriminate the Ir mark depends on the Ir content in bone of natural turtles (=0.01 ppb), and the detection limit is estimated to be 0.1 ppb. The Ir mark is therefore very useful up to 30 years or more, however, Eu is not useful in turtles.
日本水産學會の論文