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首页> 外文期刊>Journal of Fish Biology >Correlates of elemental-isotopic composition of stream fishes: the importance of land-use, species identity and body size
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Correlates of elemental-isotopic composition of stream fishes: the importance of land-use, species identity and body size

机译：物质同位素组成的相关性：土地使用的重要性，物种身份和体型

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The isotopic (C-13 and N-15) and stoichiometric (C:N:P) compositions of four fish species (Family Centrarchidae: Lepomis auritus, Lepomis cyanellus; Family Cyprinidae: Nocomis leptocephalus, Semotilus atromaculatus) were examined across four North Carolina Piedmont streams arrayed along an urbanization gradient. Both isotopic and stoichiometric composition of fishes appeared to track changes occurring in basal resource availability. Values of C-13 of basal resources and consumers were more enriched at the most urbanized streams. Similarly, basal resources and consumers were N-15-enriched at more urbanized streams. Basal resource stoichiometry varied across streams, with periphyton being the most variable. Primary consumers stoichiometry also differed across streams. Intraspecific variation in fish stoichiometry correlated with the degree of urbanization, as the two cyprinids had higher N content and L. cyanellus had higher P content in more urbanized streams, probably due to enrichment of basal resources. Intrinsic factors, specifically species identity and body size also affected stoichiometric variation. Phosphorus (P) content increased significantly with body size in centrarchids, but not in cyprinids. These results suggest that although species identity and body size are important predictors of elemental stoichiometry, the complex nature of altered urban streams may yield imbalances in the elemental composition of consumers via their food resources.
机译：同位素（C-13和N-15）和化学计量（C：N：P）四种鱼类（Family Centrarchidae：Lepomis Auritus，Lepomis cyanellus;家庭cyprinidae：Nocomis Leptocephalus，Semotilus atromaculatus）的组成被检查在四个北卡罗来纳州沿着城市化梯度排列的皮埃蒙特溪流。同位素和化学计量的鱼类的组成似乎在基础资源可用性中跟踪发生的变化。基础资源和消费者的C-13的价值观更丰富在最城市化的流中。同样，基础资源和消费者在更多城市化的溪流上富集。基础资源化学计量在跨河上变化，Periphyton是最具变量的。主要消费者的化学计量也有所不同。鱼类化学计量的内部变化与城市化程度相关，因为两种脱蛋白具有较高的N含量，L. cyanellus在更城市化的流中具有更高的P含量，可能是由于基础资源的富集。内在因素，特异性物种身份和体型也影响了化学计量的变化。磷（P）含量在厘米中的体型显着增加，但不在脱核苷中。这些结果表明，虽然物种形式和体型是元素化学计量的重要预测因子，但城市溪流改变的复杂性可能通过其食物资源产生消费者元素组成的不平衡。

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