When animals are not quite what they eat: diet digestibility influences13C-incorporation rates and apparent discrimination in a mixed-feeding herbivore

生物 粪便 食草动物 干草 动物科学 消化(炼金术) 反刍动物 稳定同位素比值 干物质 食品科学 植物 农学 生态学 牧场 化学 色谱法 量子力学 物理
作者
Daryl Codron,Jacqui Codron,Matt Sponheimer,Stefano M. Bernasconi,Marcus Clauß
出处
期刊:Canadian Journal of Zoology [Canadian Science Publishing]
卷期号:89 (6): 453-465 被引量:49
标识
DOI:10.1139/z11-010
摘要

The stable carbon isotope composition of animal tissues represents the weighted sum of the variety of food sources eaten. If sources differ in digestibility, tissues may overrepresent intake of more digestible items and faeces may overrepresent less digestible items. We tested this idea using whole blood and faeces of goats ( Capra hircus L., 1758) fed different food mixtures of C 3 lucerne ( Medicago sativa L.) and C 4 grass ( Themeda triandra Forssk.). Although blood and faecal δ 13 C values were broadly consistent with diet, results indicate mismatch between consumer and diet isotope compositions: both materials overrepresented the C 3 (lucerne) component of diets. Lucerne had lower fibre digestibility than T. triandra, which explains the results for faeces, whereas underrepresentation of dietary C 4 in blood is consistent with low protein content of the grass hay. A diet switch experiment revealed an important difference in 13 C-incorporation rates across diets, which were slower for grass than lucerne diets, and in fact equilibrium states were not reached for all diets. Although more research is needed to link digestive kinetics with isotope incorporation, these results provide evidence for nonlinear relationships between consumers and their diets, invoking concerns about the conceptual value of “discrimination factors” as the prime currency for contemporary isotope ecology.
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