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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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摘要

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 (δ13CZoo and δ15NZoo). The objectives of this study were to examine whether δ13CZoo and δ15NZoo 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 δ13CZoo and δ15NZoo and select environmental variables. The δ13CZoo in these reservoirs was enriched in August and depleted in December, and varied significantly along the continuum of trophic levels. By contrast, δ15NZoo was depleted in August and enriched in December, and did not increase significantly with an increase in trophic state. Both δ13CZoo and δ15NZoo were more strongly correlated with environmental factors than δ13CPOM and δ15NPOM were. In addition, more environmental factors were significantly correlated with δ13CZoo and the δ15NZoo than with δ13CPOM and δ15NPOM. When data from two seasons were pooled, δ13CZoo was strongly correlated with dissolved inorganic nitrogen (DIN), soluble reactive phosphorus (SRP) and the DIN:SRP ratio, while δ15NZoo was weakly correlated with nutrient concentrations. This study indicates that, compared to the stable isotope composition of POM, δ13CZoo is a better indicator of primary productivity and trophic state, while δ15NZoo 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）从中国南部的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（δ13CZoo和δ15NZoo）。这项研究的目的是检验δ13CZoo和δ15NZoo是否比悬浮颗粒有机物（POM）的稳定同位素组成更好的主要生产力和营养状态指标，并评估δ13CZoo和δ15NZoo之间的关系并选择环境变量。这些储层中的δ13CZoo在8月富集，并在12月枯竭，并沿营养级连续变化。相比之下，δ15NZoo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显着增加。与δ13CPOM和δ15NPOM相比，δ13CZoo和δ15NZoo与环境因素的相关性更强。此外，与δ13CPOM和δ15NPOM相比，更多的环境因素与δ13CZoo和δ15NZoo显着相关。汇总两个季节的数据后，δ13CZoo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δ15NZoo与养分浓度的相关性很弱。这项研究表明，与POM的稳定同位素组成相比，δ13CZoo可以更好地指示初级生产力和营养状态，而δ15NZoo可以用作水生生态系统中氮源的替代物。

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  • 来源
    《Limnology》 |2013年第1期|97-104|共8页
  • 作者

    Wei Hou; Binhe Gu; Huajun Zhang; Jiguang Gu; Bo-Ping Han;

  • 作者单位

    Department of Ecology and Institute of Hydrobiology Jinan University">(1);

    Department of Ecology and Institute of Hydrobiology Jinan University">(1);

    Soil and Water Science Department University of Florida">(2);

    Department of Ecology and Institute of Hydrobiology Jinan University">(1);

    Department of Ecology and Institute of Hydrobiology Jinan University">(1);

    Department of Ecology and Institute of Hydrobiology Jinan University">(1);

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    δ13C; δ15N; Reservoirs; Cyclopoids; N2 fixation;

    机译：δ13​​C;δ15N;水库;摆线;N2固定;

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