指導教授：曾鈞懋臺灣大學：海洋研究所姜喆予Chiang, Che-YuChe-YuChiang2014-11-272018-06-282014-11-272018-06-282014http://ntur.lib.ntu.edu.tw//handle/246246/262606Limited knowledge concerning the effects of size composition and trophic level (TL) on mercury levels in the demersal fishes associated with human activities in the East China Sea (ECS) still exists. Here we show evidence of strong control of TL on the Hg in fish and its biomagnifications via food webs. The relationship of Hg concentrations in the demersal fishes, collected during the cruise OR1- 870 in July 2008, with environmental variables (e.g., temperature, salinity, dissolved oxygen, nutrients, chlorophyll-a) in the ESC were additionally investigated. The preliminary data of seven selected fish species in the study ranged from 2.6 and 256.2 ng g-1 for total Hg (n=72), 5.1 to 20.5 cm for body length of fish, 0.8 to 173.5 g for body weight, and 3.1 to 3.5 for trophic level, respectively. The results showed that there were good linear relationships between Hg concentrations and fish body length (R2 = 0.79) and weight (R2 = 0.82), respectively, other than environmental variables (R2 = 0 ~ 0.03). It indicates that the Hg concentration in fish is mainly controlled by the growth mechanism of the fish itself through food chain transfer. We further calculated approximately Hg accumulation rate (MAR) via the relationship of Hg concentration with the fish age estimated by using fish body length and its growth coefficient. The results showed a significantly positive correlation of MAR with trophic levels, which relationship is Ln MAR =6.07 TL-15.8 (R2 = 0.89). Globally, the MAR in the demersal fishes of the ECS is much greater than those in other continental margins, suggesting high regional Hg pollution impacts from Mainland China. The MAR as a good indicator hence provides the feasibility to examine the effect of human activities on Hg levels in fish through trophic magnification associated with environmental changes.致謝………………………………………………………………………I 摘要……………………………………………………………………...II Abstract...………………………………………………….…………….III 目錄……………………………………………………….…………….IV 圖目錄…………………………………………………….…………....VII 表目錄……………………………………………...…………………....X 第一章 緒論 1.1海洋在全球汞循環的重要性………………………………….1 1.2 汞在水生食物鏈中之傳輸及影響............……………………5 1.3底棲魚類對生態系統的重要性…………………….…………9 1.4 全球邊緣海之底棲魚類所含重金屬汞的文獻回顧…………9 1.5 研究目的……………………………………………………...10 第二章 材料及分析方法 2.1 研究區域………………………………………..……………12 2.2 採樣過程與方法…………………………………..…………12 2.3 樣品處理……………………………………………..………12 2.4 器材品質管理……………………………………..…………14 2.5 樣品消化與稀釋…………………………………..…………14 2.6 總汞分析 2.6.1 分析原理……………………………….………..……15 2.6.2 分析流程……………………………….………..……15 2.6.3 分析系統性能之比較………………….………..……16 2.7 總汞回收率……………………………….…………….……17 2.8 魚體年齡換算……………………………….…………….…17 2.9 食階定義及其值之估算……………………………………..18 2.10 生物多樣性之定義………………………………………....18 第三章 結果 3.1 東海過往汞相關研究文獻回顧……….……………….……20 3.1.1 東海優養化與生物背景之介紹…………….….….…20 3.1.2 東海表水總汞之空間分布……………………...……20 3.1.3 東海表層沉積物總汞之空間分布………….….….…20 3.2 東海之基本水文參數與底棲魚類相關資訊……….….……25 3.2.1 東海之水文參數……………………………….…..…25 3.2.2 魚體之捕獲數量與分析數量………………..….……26 3.2.3 魚體之生理特性與其所含總汞濃度分析結果..…..…26 第四章 討論 4.1魚體所含總汞濃度與其他相關參數之討論……………….…32 4.1.1魚體各器官所含總汞濃度之比較………………….…32 4.1.2 魚體所含總汞濃度與其體長、體重之間的關係……35 4.1.3 捕獲魚體汞濃度與其年齡分布與關係……….….…..39 4.1.4 魚體汞濃度多寡之比較………………………………39 4.1.4.1 東海………………………………………….39 4.1.4.2 全球邊緣海………………………………….42 4.2 東海底棲魚種體內汞濃度之影響因子與其分布..….………53 4.3 全球底棲魚種所含總汞濃度之概況及累積速率之比較........60 4.3.1 底棲魚類總汞累積速率比較之基準……………...….60 4.3.2汞在世界各地乾濕沉降背景值及建立方法之應用….61 第五章 結論………………………………………….……………...…67 參考文獻……………………………………………………….….……683400427 bytesapplication/pdf論文公開時間：2019/09/16論文使用權限：同意有償授權(權利金給回饋學校)汞底棲魚魚體大小食階東海[SDGs]SDG15thesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/262606/1/ntu-103-R99241410-1.pdf