| 摘要: |
| 采用胃含物分析法及碳、氮稳定同位素法, 对北部湾带鱼的饵料组成、营养级和摄食习性随肛长的变化进行研究。结果表明, 北部湾带鱼的食物主要由中上层鱼类、头足类、底栖甲壳类以及浮游动物等 43 种饵料生物组成, 以质量百分比为指标, 鲹 优势饵料为蓝圆 、裘氏小沙丁鱼、少鳞犀鳕和尖吻小公鱼等鱼类以及中国枪乌贼(6.07%)等头足类。 δ13C 值随着生物栖息水层的深度而增加, 鲹 饵料生物中的中上层鱼类蓝圆 和底栖鱼类粗纹 分别具有最低和最高值。根据食物质量比例及δ15N 计算的北部湾带鱼营养级平均值和周年平均值均为 3.7。带鱼营养级在各月份之间周年变化及随肛长增加差异不显著。真空冷冻干燥与恒温烘干进行样品预处理δ13C 差异不显著, 而δ15N 则差异极显著。 |
| 关键词: 碳、氮稳定同位素, 胃含物分析, 北部湾, 带鱼, 食性, 营养级 |
| DOI：10.11693/hyhz201201031031 |
| 分类号: |
| 基金项目:国家自然科学基金项目, 30771653号; 农业部南海渔业资源调查, 2008专项; 广东省教育厅高校优秀青年创新人才培育项目, LYM09089 号; 广东海洋大学引进人才科研启动项目, 2011 年; 广东海洋大学 2010 年大学生创新项目, 1056610006 号 |
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| USING STABLE ISOTOPES TO ANALYZE FEEDING HABITS AND TROPHIC POSITION OF HAIRTAIL (TRICHIURUS LEPTURUS) FROM THE BEIBU GULF, SOUTH CHINA SEA |
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YAN Yun-Rong1,2, ZHANG Wu-Ke1, LU Huo-Sheng1,2, WANG Xue-Feng1,2, LAI Jin-Yang1
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1.College of Fisheries, Guangdong Ocean University;2.Center of South China Sea Fisheries Resources Monitoring and Assessment, Guangdong Ocean University
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| Abstract: |
| The data obtained from monthly sampling in the main fishing ports of the Beibu Gulf from October 2008 to September 2009 and the data obtained from the fishery-dependent trawl survey in February 2010, in the Beibu Gulf, South China Sea were using stable isotope analysis and stomach contents analysis to study the prey category, trophic position and ontogenetic feeding habit shifts of Trichiurus lepturus. The results showed that small pelagic fish, Decapterus maruadsi, Sardinella jussieu, Stolephorus heteroloba, benthic Bregmaceros rarisquamosus, and cephalopoda, Loligo chinensis, were relatively important in the diet of T. lepturus, with the weight percentages of 26.19%, 10.21%, 9.94%, 7.20% and 6.07%, respectively, whereas the other prey species were presence in lower percentages. The δ13C signatures went from relatively low (depleted) values for pelagic species to high values for benthic species. As expected, D. maruadsi displayed the lowest value (?17.830‰) while benthic Leiognathus lineolatus displayed the highest value (?14.925‰). The absence of a significant linear correlation between the preanal length and δ13C leads to the conclusion that T. lepturus are feeding from all the water layers during the majority part of their biological life cycle. Both the average trophic level and its annual mean value were calculated by prey weight percentages and δ15N were 3.7. The trophic level of T. lepturus varied not significantly with the preanal length, despite the fact that T. margarites and T. minor increased notably in the same sea area. Two samples of dehydration were undertaken prior to the analytical determination of stable isotope ratios were tested and the results showed that vacuum freeze-drying and drying with oven at constant temperature had significant variance in δ15N but not in δ13C. Undoubtedly, SIA will play an import role in evaluating the fish feeding habits and trophic positions. At the same time, the following three key points should be taken into account: (1) SIA must be combined with the stomach contents analysis; (2) an appropriate baseline organism has to be selected and its exact trophic position should also be determined; (3) attention needs to be paid to the uncertainty of SIA application in the ontogenetic diet shifts and trophic position variations. |
| Key words: Carbon and nitrogen stable isotope analysis, Stomach content analysis, The Beibu Gulf, Trichiurus lepturus, Feeding habit, Trophic position |
