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首页> 外文期刊>Canadian Journal of Zoology >Contribution of catabolic tissue replacement to the turnover of stable isotopes in Danio rerio
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Contribution of catabolic tissue replacement to the turnover of stable isotopes in Danio rerio

机译：分解代谢组织替代对里约热内卢稳定同位素转换的贡献

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摘要

Stable isotopes of carbon, nitrogen, and sulfur in organisms can trace nutrient sources and determine trophic interactions. However, time is required for an organism to reflect the isotopic composition of its diet. The rate at which an organism incorporates the isotopic signature of its food has a growth (k) component and a metabolic tissue replacement (m) component. This study shows that metabolic tissue replacement accounts for between 68% and 80% of the observed changes in isotopic signature in zebra danio (Danio rerio (Hamilton, 1822)) muscle following a dietary shift, with the remainder owing to growth of new tissue. The half-lives of carbon, nitrogen, and sulfur were -53, -147 and -58 days, respectively. This indicates that a significant period of isotopic disequilibria exists before zebra danio resemble dietary isotopic composition. These results show that catabolic replacement of tissue, as well as growth, must be taken into account when predicting the rate of isotope incorporation in warm-water fish. When using isotopic ratios to decipher food webs and trophic interactions, researchers should be aware that the often held assumption of isotopic equilibrium between diet and consumer may be violated.
机译：生物中碳，氮和硫的稳定同位素可以追踪营养来源并确定营养相互作用。但是，生物体需要时间来反映其饮食中的同位素组成。生物体掺入其食物的同位素特征的速率具有生长（k）成分和代谢组织替代（m）成分。这项研究表明，在饮食结构改变后，代谢组织替代占斑马斑马（Danio rerio（Hamilton，1822））肌肉中观察到的同位素特征变化的68％至80％，其余部分归因于新组织的生长。碳，氮和硫的半衰期分别为-53，-147和-58天。这表明在斑马danio类似于饮食同位素组成之前，存在相当长的同位素失衡时期。这些结果表明，在预测温水鱼中同位素的掺入速率时，必须考虑组织的分解代谢替代以及生长。当使用同位素比率来解释食物网和营养相互作用时，研究人员应意识到，饮食和消费者之间经常存在的同位素平衡假设可能会被违反。

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