Persson Maria E, Larsson Per, Holmqvist Niklas, Stenroth Patrik
Department of Ecology, Chemical Ecology and Ecotoxicology, Ecology Building, Lund University, SE-223 62 Lund, Sweden.
Environ Pollut. 2007 Jan;145(1):131-7. doi: 10.1016/j.envpol.2006.03.036. Epub 2006 May 19.
Many studies that investigate pollutant levels, or use stable isotope ratios to define trophic level or animal origin, use different standard ways of sampling (dorsal, whole filet or whole body samples). This study shows that lipid content, SigmaPCB and delta(13)C display large differences within muscle samples taken from a single Atlantic salmon. Lipid- and PCB-content was lowest in tail muscles, intermediate in anterior-dorsal muscles and highest in the stomach (abdominal) muscle area. Stable isotopes of carbon (delta(13)C) showed a lipid accumulation in the stomach muscle area and a depletion in tail muscles. We conclude that it is important to choose an appropriate sample location within an animal based on what processes are to be studied. Care should be taken when attributing persistent pollutant levels or stable isotope data to specific environmental processes before controlling for within-animal variation in these variables.
许多研究污染物水平，或使用稳定同位素比率来定义营养级或动物来源的研究，采用不同的标准采样方式（背部、整片鱼片或全身样本）。本研究表明，取自单一大西洋鲑鱼的肌肉样本中，脂质含量、总多氯联苯（SigmaPCB）和δ(13)C存在很大差异。脂质和多氯联苯含量在尾部肌肉中最低，在前背侧肌肉中居中，在胃部（腹部）肌肉区域最高。碳的稳定同位素（δ(13)C）显示胃部肌肉区域存在脂质积累，而尾部肌肉中则减少。我们得出结论，根据要研究的过程在动物体内选择合适的样本位置很重要。在控制这些变量在动物体内的变化之前，将持久性污染物水平或稳定同位素数据归因于特定环境过程时应谨慎。
