| 基于氮稳定同位素的九龙江口鱼类营养级研究 |
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| 引用本文： | 廖建基,郑新庆,杜建国,陈彬.基于氮稳定同位素的九龙江口鱼类营养级研究[J].海洋学报,2015,37(2):93-103. |
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| 作者姓名： | 廖建基 郑新庆 杜建国 陈彬 |
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| 作者单位： | 国家海洋局 第三海洋研究所, 福建 厦门 361005 |
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| 基金项目： | 国家自然科学基金(31101902);国家海洋局第三海洋研究所基本科研业务费专项资金(海三科2011006);福建省自然科学基金(2012J05074,2014J01127);国家留学基金(201309660067);海洋公益性行业科研专项经费项目(201305030-4,201405007). |
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| 摘 要： | 采用氮稳定同位素技术对2013年6—8月九龙江口采集到的隶属于13目42科61属共71种鱼类的营养级进行研究。结果表明,九龙江口鱼类的δ15 N值跨度较大,介于7.23‰~14.66‰之间。以菲律宾蛤仔(Ruditapes philippinarum)为基准生物估算出鱼类的营养级介于1.70~3.89之间,营养级最低与最高的鱼类分别为少牙斑鲆(Pseudorhombus oligodon)与多鳞鱚(Sillago sihama)。与Fishbase同种鱼类的营养级数据进行比较,83.1%的鱼类的营养级均值处于Fishbase同种鱼类的营养级范围内,但81.7%的鱼类的营养级均值比Fishbase同种鱼类的营养级均值略低;与传统的胃含物分析结果比较,58.3%的鱼类的营养级在0.5个营养级的误差范围内。基于氮稳定同位素估算的鱼类营养级较低的原因可能与本研究样品中低龄鱼及幼鱼比例较大有关。与其他方法相比,稳定同位素法在研究体型较小的幼鱼和低龄鱼营养级更具优势。鱼类营养级随其个体大小的变化明显,但存在种的差异性:不同体长的髭缟鰕虎鱼(Tridentiger barbatus)和绿鳍鱼(Chelidonichthys kumu)的营养级跨度较大,分别为1.54和1.43;而鳓(Ilisha elongata)等的营养级则跨度较小,这可能与不同鱼类的食性变化有关。
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| 关 键 词： | 稳定同位素 九龙江口 鱼类 营养级 |
| 收稿时间： | 2014/7/15 0:00:00 |
| 修稿时间： | 2014/9/13 0:00:00 |
Study on trophic level of main fishes in the Jiulong River Estuary based on stable nitrogen isotope |
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| Liao Jianji,Zheng Xinqing,Du Jianguo and Chen Bin.Study on trophic level of main fishes in the Jiulong River Estuary based on stable nitrogen isotope[J].Acta Oceanologica Sinica (in Chinese),2015,37(2):93-103. |
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| Authors: | Liao Jianji Zheng Xinqing Du Jianguo and Chen Bin |
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| Institution: | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China |
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| Abstract: | Stable isotope technique has been increasingly applied in food web studies in the past two decades. In the study, we used the stable nitrogen isotope to analyze the trophic levels (TLs) of the 71 fishes belonging to 61 genera, 42 families and 13 orders, which were sampled from June to August 2013 in the Jiulong River Estuary. The δ15N values of fishes showed the significant variation, ranging from 7.23‰ to 14.66‰. Benthic filter-feeder Ruditapes philippinarum was used as baseline organism, and the estimated TLs of fishes ranged from 1.70 of Pseudorhombus oligodon to 3.89 of Sillago sihama, respectively. Compared to the data from Fishbase, it was found that the TLs of a majority of fishes (83.1%) fell within the range of Fishbase, but 83.1% of fish species was modestly lower in TL than Fishbase data. The TLs of 58.3% species estimated by stable isotope technique differed by less than 0.5 with TLs by traditional stomach content analysis. Relatively low TLs based on stable nitrogen isotope may attribute to the fact that the collected samples in our study were mainly composed of young and juvenile fishes. Our results demonstrate that stable isotope technology is a more useful tool in the estimation of TLs of juvenile fishes. In our study, TLs of some fishes varied significantly with the body size and showed species-specific characteristics: TLs of Tridentiger barbatus and Chelidonichthys kumu spanned 1.54 and 1.43 with body size increasing, respectively, which was far higher than that of Ilisha elongate. Dietary shift of different fishes may be the main factors leading to the difference. |
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| Keywords: | stable isotope Jiulong River Estuary fishes trophic levels |
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