Isotopic tissue turnover and discrimination factors following a laboratory diet switch in Colorado pikeminnow (Ptychocheilus lucius)
Isotopic tissue turnover and discrimination factors following a laboratory diet switch in Colorado pikeminnow (Ptychocheilus lucius)
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DOI：
10.1139/cjfas-2015-0531
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发表时间：
2017-02-01
影响因子：
2.4
通讯作者：
Davis, Jason E.
中科院分区：
文献类型：
--
作者：
Franssen, Nathan R.;Gilbert, Eliza I.;Davis, Jason E.
稳定同位素生态学在量化食物网中的能量转移方面取得了巨大进展。然而，当同位素周转和同位素判别因子（δ C-13或δ N-15）未知时，从野外收集的数据收集到的营养推断可能会受到限制。利用同位素饮食转换，对濒危的科罗拉多梭子鱼（Ptychocheilus lucius）的同位素转换和判别因子进行了量化。估计δ C-13的半衰期为62天或质量增加33% δ N-15平均为133天或质量增加52%。生长和代谢过程都对养分周转速率有影响，但代谢过程对δ C-13的影响大于δ N-15。经脂质校正的δ C-13值导致δ C-13的判别因子在0.67 ~ 0.82之间，δ N-15在2.31 ~ 2.93之间，与其他鱼类的值相似。这些结果表明，取样鳍组织可能是一个有用的，非致命的工具，同位素研究。鳍还证明了C-13的富集与饮食转换无关，这突出了同位素饮食转换研究中控制的重要性，以验证物种和饮食特定的同位素周转率估计。
Stable isotope ecology has made great strides in quantifying energy transfer through food webs. However, trophic inferences gleaned from field-collected data can be limited when isotopic turnover and isotopic discrimination factors (Delta C-13 or Delta N-15) are unknown. We quantified isotopic turnover and discrimination factors using an isotopic diet switch in the endangered Colorado pikeminnow (Ptychocheilus lucius). The estimated half-life for delta C-13 was 62 days or a 33% increase in mass and delta N-15 averaged 133 days or a 52% increase in mass. Growth and metabolic processes both contributed to rates of turnover, but metabolic processes had a stronger effect in delta C-13 than in delta N-15. Lipid-corrected delta C-13 values resulted in discrimination factors of Delta C-13 between 0.67 and 0.82 and Delta N-15 between 2.31 and 2.93, values similar to other fishes. These results suggest sampling fin tissue may be a useful, nonlethal tool for isotopic studies. Fins also demonstrated enrichment in C-13 that was not linked to the diet switch, highlighting the importance of controls in isotopic diet switch studies to verify species-and diet-specific estimates of isotopic turnover rates.