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首页> 外文期刊>Canadian Journal of Zoology >Do ^du15N and ^du13C values of feces reflect the isotopic composition of diets in small mammals?
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Do ^du15N and ^du13C values of feces reflect the isotopic composition of diets in small mammals?

机译：粪便的^ du15N和^ du13C值是否反映了小型哺乳动物饮食的同位素组成？

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摘要

The stable isotope composition of carbon and nitrogen in feces can be a useful tool for reconstructing diet. To examine whether the isotopic composition of feces reflect those of diet, we determined the fractionation of u15N and u13C along the digestive tracts of several species of small mammals. There were significant differences in the ^du15N values of digesta in different compartments of the gastrointestinal (GI) tract, with consistent enrichment of u15N in the stomach, intestine, and cecum, and the depletion of u15N in the colon (i.e., feces). Although feces had lower ^du15N values than digesta in the cecum, feces of small mammals were significantly more enriched in u15N (by ^62.5ppm) than diet. The mechanisms causing this enrichment in the GI tract may arise from the operation of different biochemical pathways within the different GI compartments.
机译：粪便中碳和氮的稳定同位素组成可能是重建饮食的有用工具。为了检查粪便的同位素组成是否能反映饮食结构，我们确定了u15N和u13C在几种小哺乳动物物种的消化道中的分馏作用。胃肠道（GI）不同隔室中消化物的^ du15N值存在显着差异，其中u15N在胃，肠和盲肠中的含量持续增加，而结肠中的u15N消耗（即粪便）。尽管粪便中盲肠的^ du15N值低于消化液，但小型哺乳动物的粪便中的u15N含量（饮食含量）远高于饮食（^ 62.5ppm）。导致胃肠道中这种富集的机制可能是由于不同胃肠道腔室内部不同生化途径的运作所致。

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