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首页> 外文期刊>Aquatic Biology >Influence of diet on stable carbon isotope composition in otoliths of juvenile red drumSciaenops ocellatus
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Influence of diet on stable carbon isotope composition in otoliths of juvenile red drumSciaenops ocellatus

机译：饮食对少年红鼓耳石耳中稳定碳同位素组成的影响

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Stable carbon isotope values of otoliths can provide long-term records of the environmental conditions experienced by fish. However, because otoliths contain carbon from metabolic sources, it is necessary to determine the proportion of metabolically derived carbon to properly interpret otolith delta~(13)C values. To evaluate the relative influence of dietary carbon and the dissolved inorganic carbon (DIC) of ambient seawater on the delta~(13)C isotopic composition of fish otoliths, juvenile red drumSci-aenops ocellatus were raised for 6 and 9 mo in tanks with flow-through ambient seawater and fed diets differing by 2.1 %o (p < 0.001) in carbon isotope composition (delta~(13)C). At the end of the experiment, muscle tissue from the 2 treatments reflected the isotopic composition of the diets and differed by 2.1%0 (p <0.001). Muscle tissue from both groups was enriched by 1.5%0 in ~(13)C relative to the respective diets. The carbon isotope values of otoliths were enriched by -16 to 17 %o relative tothe respective diets, indicating that DIC was the dominant source (85 to 92%) for otolith carbon relative to carbon derived from diet. However, otoliths from the 2 treatments differed by 1.26%o and expressed 60% of the difference in the isotope values ofthe diets. This result indicates that the nutritional characteristics of food may be a factor influencing the incorporation of metabolic carbon in the otolith. This is one of the first studies to provide evidence that the nutritional value of food influences otolith delta~(13)C value.
机译：耳石的稳定碳同位素值可以提供鱼类经历的环境条件的长期记录。但是，由于耳石含有来自代谢源的碳，因此有必要确定代谢衍生碳的比例，以正确解释耳石δ〜（13）C值。为了评估日粮碳和环境海水中的溶解性无机碳（DIC）对鱼耳石的δ〜（13）C同位素组成的相对影响，在有流量的水箱中将幼年红鼓S鱼（Sci-aenops ocellatus）饲养了6和9 mo。 -通过周围的海水和饲喂日粮，其碳同位素组成（δ〜（13）C）相差2.1％o（p <0.001）。在实验结束时，两种处理的肌肉组织反映了饮食的同位素组成，相差2.1％0（p <0.001）。相对于各自的饮食，两组的肌肉组织在〜（13）C中的含量增加了1.5％0。相对于各自的饮食，耳石的碳同位素值富集了-16％至17％o，这表明相对于饮食中的饮食，DIC是耳石碳的主要来源（85％至92％）。然而，两种处理的耳石相差1.26％o，表示日粮同位素值差异的60％。该结果表明食物的营养特性可能是影响耳石中代谢碳掺入的因素。这是最早提供证据证明食物的营养价值影响耳石δ〜（13）C值的研究之一。

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