Variation in trophic shift for stable isotope ratios of carbon, nitrogen, and sulfur
Variation in trophic shift for stable isotope ratios of carbon, nitrogen, and sulfur
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DOI：
10.1034/j.1600-0706.2003.12098.x
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发表时间：
2003-08-01
期刊：
影响因子：
3.4
通讯作者：
McGrath, CC
中科院分区：
文献类型：
--
作者：
McCutchan, JH;Lewis, WM;McGrath, CC
使用稳定的同位素比率来追踪消费者中有机物质的途径，需要了解饮食和消费者之间的同位素变化。消费者之间的营养转变可能存在很大差异。对于已发表文献的数据和补充原始数据(不包括流食消费者)，碳的平均同位素位移为+0.5+/-0.13ppm，而不是通常假设的0.0ppm。对于肌肉分析的消费者来说，C的转变(+1.3+/-0.30 ppm)高于整体分析的消费者(+0.3+/-0.14 ppm)。在整体分析的消费者中，分析前酸化的消费者对C的营养转移(-0.2+/-0.21 ppm)低于未酸化的样品(+0.5+/-0.17 ppm)。对于N，以无脊椎动物饲料饲养的消费者(+1.4+/-0.21ppm)的营养转移低于以其他高蛋白饲料饲养的消费者(+3.3+/-0.26ppm)，而以植物和藻类饲料饲养的消费者(+2.2+/-0.30ppm)居中。S的营养转移在高蛋白饲料(+2.0ppm/-0.65ppm)和低蛋白质饲料(45ppm/-0.56ppm)之间不同。因此，分析方法和饮食差异可能会影响消费者的营养转变；如果将这些信息纳入营养关系研究，稳定同位素方法的实用性可以得到改善。虽然很少有关于稳定同位素比率的研究考虑营养转移的变化，但这种变化很重要，因为营养转移估计中的小误差可能导致对来源对消费者的贡献的估计或营养位置估计的大误差。
Use of stable isotope ratios to trace pathways of organic matter among consumers requires knowledge of the isotopic shift between diet and consumer. Variation in trophic shift among consumers can be substantial. For data from the published literature and supplementary original data (excluding fluid-feeding consumers), the mean isotopic shift for C was + 0.5 +/- 0.13parts per thousand rather than 0.0parts per thousand, as commonly assumed. The shift for C was higher for consumers analyzed as muscle (+ 1.3 +/- 0.30parts per thousand) than for consumers analyzed whole (+ 0.3 +/- 0.14parts per thousand). Among consumers analyzed whole, the trophic shift for C was lower for consumers acidified prior to analysis (- 0.2 +/- 0.21parts per thousand) than for unacidified samples (+ 0.5 +/- 0.17parts per thousand). For N, trophic shift was lower for consumers raised on invertebrate diets (+ 1.4 +/- 0.21parts per thousand) than for consumers raised on other high-protein diets (+ 3.3 +/- 0.26parts per thousand) and was intermediate for consumers raised on plant and algal diets (+ 2.2 +/- 0.30parts per thousand). The trophic shift for S differed between high-protein (+ 2.0 +/- 0.65parts per thousand) and low-protein diets (45 +/- 0.56parts per thousand). Thus, methods of analysis and dietary differences can affect trophic shift for consumers; the utility of stable isotope methods can be improved if this information is incorporated into studies of trophic relationships. Although few studies of stable isotope ratios have considered variation in the trophic shift, such variation is important because small errors in estimates of trophic shift can result in large errors in estimates of the contribution of sources to consumers or in estimates of trophic position.