张丽蓉, 郝慧敏, 聂竹兰, 魏杰, 张蝶燕. 基于特征脂肪酸和稳定同位素技术的新疆长身高原鳅摄食习性研究[J]. 南方水产科学. DOI: 10.12131/20230187
引用本文: 张丽蓉, 郝慧敏, 聂竹兰, 魏杰, 张蝶燕. 基于特征脂肪酸和稳定同位素技术的新疆长身高原鳅摄食习性研究[J]. 南方水产科学. DOI: 10.12131/20230187
ZHANG Lirong, HAO Huimin, NIE Zhulan, WEI Jie, ZHANG Dieyan. Feeding habits of Triplophysa tenuis in Xinjiang based on fatty acid and stable carbon and nitrogen isotopic analysis[J]. South China Fisheries Science. DOI: 10.12131/20230187
Citation: ZHANG Lirong, HAO Huimin, NIE Zhulan, WEI Jie, ZHANG Dieyan. Feeding habits of Triplophysa tenuis in Xinjiang based on fatty acid and stable carbon and nitrogen isotopic analysis[J]. South China Fisheries Science. DOI: 10.12131/20230187

基于特征脂肪酸和稳定同位素技术的新疆长身高原鳅摄食习性研究

Feeding habits of Triplophysa tenuis in Xinjiang based on fatty acid and stable carbon and nitrogen isotopic analysis

  • 摘要: 长身高原鳅 (Triplophysa tenuis) 在木扎提河中对维持水生态系统物质和能量流动具有重要作用。文章基于脂肪酸生物标记法和碳、氮稳定同位素 (δ13C、δ15N) 技术研究了长身高原鳅食性和营养生态位特征。结果显示,其肌肉中共检测出22种脂肪酸,其中有8种饱和脂肪酸、6种单不饱和脂肪酸、8种多不饱和脂肪酸;由特征脂肪酸组成情况推测,长身高原鳅对浮游动物、硅藻、陆地植物或喜摄食硅藻的鱼虾均有摄食,表现为杂食性。长身高原鳅稳定同位素中δ13C和δ15N范围分别介于−27.09‰~−20.98‰和5.71‰~8.45‰,营养级范围介于2.68~3.48。雌雄样本间δ13C、δ15N、营养级均不存在显著性差异 (P>0.05);雄性样本核心生态位 (SEAc) 和总生态位 (TA) 均高于雌性。δ13C与体长间表现极显著正相关性 (P<0.01),δ15N值和营养级与体长间不具有显著性相关性。70~80 mm体长组与90 mm以上体长组SEAc面积不存在重叠且在聚类分析中分为不同组。综上,长身高原鳅食性为杂食性且食物组成随体长变化而不同,作为营养级偏高的捕食者,长身高原鳅能延长食物链长度,增加食物网复杂性,有利于维持水域生态系统稳定性。

     

    Abstract: Triplophysa tenuis plays an important role in maintaining the flow of material and energy in the aquatic ecosystem. In this study, we applied the fatty acid biomarker method and carbon and nitrogen stable isotope technique to study the feeding and nutritional ecological niche characteristics of T. tenuis. The results show that a total of 22 fatty acids were detected in the muscle, including eight kinds of saturated fatty acids (SFA), six kinds of monounsaturated fatty acids (MUFA) and eight kinds of polyunsaturated fatty acids (PUFA). The specific fatty acid analysis reveals that T. tenuis feeds on zooplankton, diatoms, land plants, or fish and shrimp that like to feed on diatoms. The carbon stable isotope (δ13C) values and nitrogen stable isotope (δ15N) values ranged from −27.09‰ to −20.98‰ and 5.71‰ to 8.45‰, and trophic levels ranged from 2.68 to 3.48. There were no significant differences between males and females (P>0.05) in δ13C value, δ15N value or trophic level. Male samples had higher core niche indicator (SEAc) and total niche indicator (TA) than females. There were significant changes in δ13C values with increasing body length (P<0.01), and insignificant changes in δ15N values and trophic level. The SEAc areas of 70−80 mm body length group did not overlap with those of the greater than 90 mm body length group, and were categorized into different groups in the cluster analysis. In conclusion, T. tenuis is omnivorous and its food composition varies with body length, and as a predator with a high trophic level, it can extend the length of the food chain and increase the complexity of the food web, which is conducive to the maintenance of the stability of aquatic ecosystem.

     

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