1980-82年および1984-86年に捕獲した南半球産ミンククジラの水銀蓄積の比較 Comparison of Mercury Accumulation in Antarctic Minke Whale Collected in 1980-82 and 1984-86
Mercury concentrations were determined in the liver of Antarctic minke whale (<i>Balaenoptera acutorostrata</i>) collected during 1980-82 and 1984-86, and compared in view of age-dependent accumulation. No significant sexual and geographical variations were observed, while higher mercury concentrations were found in the liver of Antarctic minke whales caught in the 1984-86 season rather than in 1980-82 by commercial whaling. Mercury concentration elevated with age until maturity and then revealed a steady state or slightly declined. However, the age showing maximum level of mercury was found to be older in 1984-86 than in 1980-82. This observation might be attributable to temporal changes in feeding amounts, resulting from disturbance of the Antarctic ecosystem such as uncontrolled management of whale resources in the past.
日本水産学会誌 64(1), 105-109, 1998-01-15