| 引用本文: | 徐军,张敏,谢平.氮稳定同位素基准的可变性及对营养级评价的影响.湖泊科学,2010,22(1):8-20. DOI:10.18307/2010.0102 |
| XU Jun,ZHANG Min,XIE Ping.Variability of stable nitrogen isotopic baselines and its consequence for trophic modeling. J. Lake Sci.2010,22(1):8-20. DOI:10.18307/2010.0102 |
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| 摘要: |
| 稳定同位素技术已经成为生态学家研究生态系统特征与过程的重要手段之-。在利用稳定同位素研究植物-动物和动物之间的营养关系或者进行多生态系统的比较研究过程中,通常需要选择某种生物的稳定同位素作为"基准(baseline)"。同位素基准的目的是反映食物网生物最初物质来源的同位素特征。同位素基准的选择取决于具体研究问题与系统。本文综述了水域生态系统研究中初级生产者和初级消费者氮稳定同位素作为基准的应用。不同的研究都根据自身所关注的生态学问题对基准进行选择和校正。然而,找到适当的同位素基准取决于同位素基准种内、种间和时空上的同位素变化特征,同时还取决于所关注的生态学问题的时间、空间尺度。本文评估了季节性和种内的同位素变异性对消费者营养级位置的影响。质量平衡模型的计算结果说明同位素基准可变性可以显著影响对消费者营养级位置的评估。 |
| 关键词: 水域生态学 稳定同位素 营养级 基准 初级生产者 初级消费者 指示生物 同位素分馏 周转速率 |
| DOI：10.18307/2010.0102 |
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| 基金项目:国家重点基础研究发展计划项目(2008CB418001-1,2007CB109205);国家自然科学基金项目(30870428)联合资助 |
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| Variability of stable nitrogen isotopic baselines and its consequence for trophic modeling |
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XU Jun1, ZHANG Min2, XIE Ping1
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1.Donghu Experimental Station of Lake Ecosystems,State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,P.R.China;2.College of Fishery,Huazhong Agricultural University,Wuhan 430070,P.R.China
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| Abstract: |
| Ecologists frequently use stable isotopes to measure the pattern and process of interested ecosystems. Comparisons offood web structure among and within ecosystems rely on a baseline isotopic signature for each system.'The goal of a trophic baselineis to reflect the isotopic signature of the primary source of materials and nutrients for the Food web. In general isotope baseline se-lection depends on the specific research question and must be tailored to a particular study system. We reviewed the use of the sta-ble nitrogen isotopic signatures of primary producers and primary consumers to develop the baseline in aquatic ecology. Each ofthese studies used x slightly different method of baseline correction that was tailored to address a question of speci$c ecological in-terest. However, choosing an appropriate Laseline depends on the inter and intraspecific spatial, temporal variability of isotopicbaselines and on the spatial and temporal context of the ecological question under consideration. We also evaluated to what extentisotopic heterogeneity actually influence consumer' s trophic positions ai the temporal and intraspecifical scales. The result of troph-ic; position output estimated using an isotopic mixing model was generally variable, provided that baseline variability for trophic po-sition estimation were sufficiently distinct in dietary mixing models. |
| Key words: Aquatic ecology stable isotope trophic position baseline primary production primary consumer bioindicator fractionation turnover rate |
