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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Diet-shift driven delta C-13 and delta N-15 changes in liver and muscle tissues of juvenile clownfish Amphiprion frenatus: A laboratory experiment
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Diet-shift driven delta C-13 and delta N-15 changes in liver and muscle tissues of juvenile clownfish Amphiprion frenatus: A laboratory experiment

机译：饮食转换驱动的小丑鱼两栖动物肝和肌肉组织中的δC-13和δN-15改变：一项实验室实验

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A laboratory-based diet-shift study using juvenile downfish (Amphiprion frenatus) was performed to determine 1) isotopic turnover rates and 2) trophic fractionation of delta C-13 and delta N-13 in liver and muscle tissues. A brood of A. frenatus was first fed shrimps (Acetes elythraeus) with delta C-13 = -19.2 parts per thousand and delta N-13 = 8.3 parts per thousand for 29 days to provide an isotopic baseline. Subsequently, they were fed muscle filets from a predatory reef fish (Sparus latus) with isotopic signature of delta C-13 = -15.9 parts per thousand and delta N-13 = 11.3 parts per thousand. The results showed significant differences in delta C-13 and delta N-15 between liver and muscle throughout the most of the experiment, indicating different incorporation of isotopes by these two tissues. delta C-13 in muscle tissue was less depleted than liver tissue before the diet shift and more depleted after. The change in isotopic composition was significantly faster for liver than muscle tissue after the diet-shift. A hyperbolic saturation model provided a good fit for predicting the time scale of isotopic turnover. The model showed that liver tissue approaches isotopic saturation 3-4 times faster than muscle tissue. Isotopic fractionations extrapolated from the model output at saturation were remarkably similar for liver and muscle tissues (Delta C-13 of -0.5 and -03 parts per thousand, and Delta N-15 of 2.6 and 2.8 parts per thousand, respectively), which indicates that fractionation is independent of tissue or organ in A. frenatus. Liver tissue therefore appears more useful than muscle tissue as a short-term dietary indicator for A. frenatus and possibly also for other fish species. (C) 2015 Elsevier B.V. All rights reserved.
机译：进行了一项基于实验室的饮食变化研究，研究使用了少年down鱼（Amphiprion frenatus），以确定1）同位素转换率和2）肝脏和肌肉组织中C-13和N-13的营养级分。首先在29天的时间内给C.frenatus一个亲虾饲喂对虾（Acetes elythraeus），其C-13等于每千份-19.2份，N-13等于每千份8.3份，以提供同位素基准。随后，他们从掠食性礁鱼（西班牙rus鱼）的肌肉鱼片中饲喂，其同位素特征为δC-13 =千分之几-15.9份和δN-13 =千分之几的11.3份。结果表明，在整个实验的大部分时间里，肝脏和肌肉之间的δC-13和δN-15差异显着，表明这两种组织的同位素掺入不同。饮食改变之前，肌肉组织中的δC-13消耗少于肝脏组织，而消耗后则消耗更多。饮食转移后，肝脏的同位素组成变化明显快于肌肉组织。双曲线饱和度模型非常适合预测同位素转换的时间尺度。该模型显示，肝脏组织达到同位素饱和的速度比肌肉组织快3-4倍。从模型输出在饱和状态下推断出的同位素分数对于肝脏和肌肉组织非常相似（Delta C-13为-0.5和-03千分之几，Delta N-15为2.6和2.8千分之几），这表明该分离不依赖于巴西曲霉的组织或器官。因此，肝组织似乎比肌肉组织更有用，可以作为法国曲霉菌以及其他鱼类的短期饮食指标。 （C）2015 Elsevier B.V.保留所有权利。

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