Hayden B, Tongnunui S, Beamish F W H, Nithirojpakdee P, Cunjak R A
Canadian Rivers Institute and Biology Department, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada.
Environmental Science, Faculty of Science, Burapha University, Bangsaen, Chon Buri 20131, Thailand.
J Fish Biol. 2017 Aug;91(2):574-586. doi: 10.1111/jfb.13368.
Carbon and nitrogen stable-isotope ratios were compared of fin and muscle tissue from 15 fish species collected from seven headwater rivers in eastern and western Thailand. In addition, two-source stable-isotope mixing models were used to derive estimates of each fish's reliance on allochthonous and autochthonous energy based on fin and muscle tissues. Across the dataset, fish fin was enriched in C relative to muscle by c. 1·5‰. Variation in δ N between tissues was below statistically significant levels. Estimates of autochthonous resource use calculated from fin tissue were on average 15% greater than those calculated from muscle. Linear mixed-effects models indicated that inter-tissue variation in estimates of resource use was predominantly related to inter-tissue variation in δ C. Fish fin is a credible and desirable alternative to tissues such as muscle or liver which require destructive sampling of fishes. Care must be taken, however, when estimating resource use or interpreting previous estimates of resource use derived from different tissues.
对从泰国东部和西部七条源头河流采集的15种鱼类的鳍和肌肉组织的碳和氮稳定同位素比率进行了比较。此外，基于鳍和肌肉组织，使用双源稳定同位素混合模型来估计每条鱼对异源和本地能量的依赖程度。在整个数据集中，相对于肌肉，鱼鳍中的碳富集了约1.5‰。组织间δN的变化低于统计学显著水平。从鳍组织计算得出的本地资源利用估计值平均比从肌肉计算得出的估计值高15%。线性混合效应模型表明，资源利用估计值的组织间差异主要与δC的组织间差异有关。鱼鳍是肌肉或肝脏等需要对鱼类进行破坏性采样的组织的可靠且理想的替代物。然而，在估计资源利用或解释先前从不同组织得出的资源利用估计值时必须谨慎。
