https://scholars.lib.ntu.edu.tw/handle/123456789/630275
標題: | Mercury stable isotopes reveal sources of methylmercury and prey in giant Pacific bluefin tuna from the western North Pacific Ocean | 作者: | He, Xiaoshuai Chen, Yi Sheng Ang, Shin Jing JEN-CHIEH SHIAO CHUN-MAO TSENG Reinfelder, John R. |
關鍵字: | MASS-INDEPENDENT FRACTIONATION; THUNNUS-THYNNUS-ORIENTALIS; EAST CHINA SEA; VERTICAL MOVEMENTS; MARINE MERCURY; HG; BIOACCUMULATION; ACCUMULATION; MIGRATION; REDUCTION | 公開日期: | 1-一月-2023 | 出版社: | WILEY | 來源出版物: | Limnology And Oceanography Letters | 摘要: | Sources of methylmercury (MeHg) in adult Pacific bluefin tuna (Thunnus orientalis, PBT) from the western North Pacific Ocean (WPO) were examined using mercury stable isotopes. Significant increases in δ202Hg and Δ199Hg values with PBT size and age, along with those of potential prey, indicate a shift in the source of MeHg accumulated by PBT as they age. Among adults from the WPO, this shift likely involves greater accumulation of MeHg from epipelagic prey in the Kuroshio extension in large vs. small and medium-sized PBT. For all adults, little MeHg is accumulated in the spawning grounds near Taiwan. Significantly lower Δ199Hg/Δ201Hg ratios in adult PBT and their prey from the WPO than from the central and eastern North Pacific indicate different sources or transformations of MeHg prior to accumulation in the WPO food web than further east. Our results show that MeHg sources to oceanic food webs vary across the North Pacific Ocean and regionally within the WPO. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/630275 | ISSN: | 2378-2242 | DOI: | 10.1002/lol2.10313 |
顯示於: | 海洋研究所 |
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