| 黄海常见鱼类体内汞含量的种内和种间差异研究 |
| 摘要点击 1914 全文点击 1194 投稿时间：2013-06-28 修订日期：2013-09-11 |
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| 中文关键词 汞 鱼类 生物累积 生物放大 黄海 |
| 英文关键词 mercury fishes bioaccumulation biomagnification the Yellow Sea |
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| 中文摘要 |
| 海洋鱼类体内的汞含量及其影响因素是研究汞在海洋生态系统中生物放大效应的关键问题. 为探明黄海鱼类体内汞含量的种内差异和种间差异，于2012年8~10月采集了9种共164条常见经济野生鱼类，用直接测汞仪测定了鱼体肌肉中的汞含量（总汞），同时测量了每个样品的体长、体重，并分析了不同种鱼类的食性和营养级. 164条鱼类样品肌肉中汞含量（以干重计）变化范围为0.025~0.526 μg·g-1，平均值为（0.124±0.096）μg·g-1. 同一种鱼类，汞含量与体长、体重显著正相关. 营养级大于2.8的捕食性鱼类体内汞含量高于营养级小于2.8的滤食性鱼类. 此外，体重增长快的鱼类在生长稀释作用下，肌肉中的汞含量也较低. 结果表明，体长、体重是影响黄海常见鱼类体内汞含量种内差异的重要因素，食性、营养级水平和体重增长速率的差异是影响黄海常见鱼类汞生物累积种间差异的重要因素. |
| 英文摘要 |
| Mercury concentration in marine fishes and its influencing factors are the key problems in the study of mercury biomagnification in marine ecosystems. In order to understand the inner- and inter-species differences of mercury concentration in fishes from the Yellow Sea, a total of 164 marine wild fishes covering nine different species were collected from the area from August to October, 2012. Mercury (total mercury) concentration in fish muscle tissue was measured by a direct mercury analyzer. Body length and wet weight of each sample were also determined. Moreover, feeding habit and trophic level of different species were examined. Hg concentrations (dry weight) in the muscle tissues of the 164 individuals ranged from 0.025μg·g-1 to 0.526 μg·g-1, with an average of (0.124±0.096) μg·g-1. By an inner-species analysis, log10 Hg concentration was significantly correlated to their body length and wet weight. Predator fishes with trophic level >2.8 were more readily to be contaminated by Hg than the filter feeder with trophic level<2.8. Furthermore, species with higher increasing rate of weight had lower Hg concentration in the muscle due to growth dilution. The results suggest that length and weight are the main factors affecting the inner- species difference of mercury concentration in common fishes from the Yellow Sea, while dietary preference, trophic level and increasing rate of weight are the main factors affecting the inter-species difference from the Yellow Sea. |
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