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The relationship between carbon and nitrogen stable isotopes of zooplankton and select environmental variables in low-latitude reservoirs

机译：低纬度储层浮游动物碳氮稳定同位素与选择环境变量的关系

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Cyclopoids were collected from 18 reservoirs in southern China during August (a wet month) and December (a dry month) of 2010 for the analysis of carbon and nitrogen stable isotopes (δ~(13)C_(Zoo) and δ~(15)N_(Zoo)). The objectives of this study were to examine whether δ~(13)C_(Zoo) and δ~(15)N_(Zoo) can be better indicators of primary productivity and trophic state than the stable isotope composition of suspended particulate organic matter (POM), and to evaluate the relationship between δ~(13)C_(Zoo) and δ~(15)N_(Zoo) and select environmental variables. The δ~(13)C_(Zoo) in these reservoirs was enriched in August and depleted in December, and varied significantly along the continuum of trophic levels. By contrast, δ~(15)N_(Zoo) was depleted in August and enriched in December, and did not increase significantly with an increase in trophic state. Both δ~(13)C_(Zoo) and δ~(15)N_(Zoo) were more strongly correlated with environmental factors than δ~(13)C_(POM) and δ~(15)N_(POM) were. In addition, more environmental factors were significantly correlated with δ~(13)C_(Zoo) and the δ~(15)N_(Zoo) than with δ~(13)C_(POM) and δ~(15)N_(POM). When data from two seasons were pooled, δ~(13)C_(Zoo) was strongly correlated with dissolved inorganic nitrogen (DIN), soluble reactive phosphorus (SRP) and the DIN:SRP ratio, while δ~(15)N_(Zoo) was weakly correlated with nutrient concentrations. This study indicates that, compared to the stable isotope composition of POM, δ~(13)C_(Zoo) is a better indicator of primary productivity and trophic state, while δ~(15)N_(Zoo) may be used as a proxy for nitrogen sources in aquatic ecosystems.
机译：在2010年8月（一个潮湿的月份）和12月（一个干旱的月份）从中国南方的18个储层中收集了类胡萝卜素，用于分析碳和氮稳定同位素（δ〜（13）C_（Zoo）和δ〜（15））。 N_（Zoo））。这项研究的目的是检验δ〜（13）C_（Zoo）和δ〜（15）N_（Zoo）是否可以比悬浮颗粒有机物（POM）的稳定同位素组成更好地表示初级生产力和营养状态），并评估δ〜（13）C_（Zoo）和δ〜（15）N_（Zoo）之间的关系，并选择环境变量。这些储层中的δ〜（13）C_（Zoo）在8月富集而在12月枯竭，并沿营养级连续变化。相比之下，δ〜（15）N_（Zoo）在8月耗尽并在12月富集，并且随着营养状态的增加而没有明显增加。与δ〜（13）C_（POM）和δ〜（15）N_（POM）相比，δ〜（13）C_（Zoo）和δ〜（15）N_（Zoo）与环境因素的相关性更高。另外，与δ〜（13）C_（POM）和δ〜（15）N_（POM）相比，与δ〜（13）C_（Zoo）和δ〜（15）N_（Zoo）显着相关的环境因子更多。 ）。汇总两个季节的数据后，δ〜（13）C_（Zoo）与溶解的无机氮（DIN），可溶性反应性磷（SRP）和DIN：SRP的比例密切相关，而δ〜（15）N_（Zoo） ）与养分浓度之间的相关性很弱。这项研究表明，与POM的稳定同位素组成相比，δ〜（13）C_（Zoo）可以更好地指示初级生产力和营养状态，而δ〜（15）N_（Zoo）可以替代用于水生生态系统中的氮源。

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