INFLUENCE OF DIET ON THE DISTRIBUTION OF NITROGEN ISOTOPES IN ANIMALS
INFLUENCE OF DIET ON THE DISTRIBUTION OF NITROGEN ISOTOPES IN ANIMALS
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DOI：
10.1016/0016-7037(81)90244-1
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发表时间：
1981-01-01
影响因子：
5
通讯作者：
EPSTEIN, S
中科院分区：
文献类型：
--
作者：
DENIRO, MJ;EPSTEIN, S
通过分析在实验室中饲养的动物的恒定的N同位素组成的饮食上的N同位素的分布的饮食的影响进行了研究。动物体内氮的同位素组成反映了其饮食的氮同位素组成。动物全身的δ 15 N值通常比其饮食的δ 15 N值更正。以相同饮食饲养的物种的不同个体可具有显著不同的δ 15 N值。动物的δ 15 N值与其饮食之间的关系的可变性对于以相同饮食饲养的不同物种比对于以不同饮食饲养的相同物种更大。小鼠的不同组织相对于饮食也富含15 N，组织和饮食的δ 15 N值之间的差异取决于组织的种类和所涉及的饮食。胶原蛋白和甲壳质的δ 15 N值也与饮食的δ 15 N值相关，胶原蛋白和甲壳质是经常保存在化石动物遗骸中的生化成分。整个动物及其组织和生化组分的δ 15 N值对饮食δ 15 N值的依赖性表明，如果动物的潜在食物来源具有不同的δ 15 N值，则动物N的同位素组成可用于获得关于动物饮食的信息。膳食分析的N同位素方法可能可以用来估计相对使用豆类与非豆类或水生与陆生生物作为现存和化石动物的食物来源。该方法可能不适用于那些现代生态系统中，化肥的使用影响了食物来源中的N同位素的分布。饮食分析的同位素方法被用来重建的饮食变化的人口，占据了墨西哥的特瓦坎山谷超过7000年的跨度。骨胶原的δ 13 C和δ 15 N值的变化表明，C4和/或CAM（景天科酸代谢）植物（可能主要是玉米）和豆类（可能主要是豆类）被引入饮食中比常规考古学分析所建议的要早得多。
The influence of diet on the distribution of N isotopes was investigated by analyzing animals raised in the laboratory on diets of constant N isotopic composition. The isotopic composition of the N in an animal reflects the N isotopic composition of its diet. The .delta.15N values of the whole bodies of animals are usually more positive than those of their diets. Different individuals of a species raised on the same diet can have significantly different .delta.15N values. The variability of the relationship between the .delta.15N values of animals and their diets is greater for different species raised on the same diet than for the same species raised on different diets. Different tissues of mice are also enriched in 15N relative to the diet, with the difference between the .delta.15N values of a tissue and the diet depending on both the kind of tissue and the diet involved. The .delta.15N values of collagen and chitin, biochemical components that are often preserved in fossil animal remains, are also related to the .delta.15N value of the diet. The dependence of the .delta.15N values of whole animals and their tissues and biochemical components on the .delta.15N value of diet indicates that the isotopic composition of animal N can be used to obtain information about an animal''s diet if its potential food sources had different .delta.15N values. The N isotopic method of dietary analysis probably can be used to estimate the relative use of legumes vs. non-legumes or of aquatic vs. terrestrial organisms as food sources for extant and fossil animals. The method probably will not be applicable in those modern ecosystems in which the use of chemical fertilizers has influenced the distribution of N isotopes in food sources. The isotopic method of dietary analysis was used to reconstruct changes in the diet of the human population that occupied the Tehuacan Valley of Mexico over a 7000 yr span. Variations in the .delta.13C and .delta.15N values of bone collagen suggest that C4 and/or CAM (crassulacean acid metabolism) plants (presumably mostly corn) and legumes (presumably mostly beans) were introduced into the diet much earlier than suggested by conventional archaeological analysis.