| 摘要: |
| 饵料生物在海洋生态系统中处于承上启下的关键地位，为准确评估东海中南部海域饵料生物的营养关系，基于2018年11月和2019年4月两个航次调查中收集的饵料生物的碳氮稳定同位素数据，对其营养生态位的季节变动特征及种间竞争关系进行了研究。结果表明：该海域饵料生物的碳氮稳定同位素比值跨度较大，海域整体食源多样性水平较高，营养结构较稳定；饵料生物δ13C和δ15N值存在明显的季节差异，春季饵料生物的营养级显著低于秋季；浮游动物的营养生态位在两个季节间未发生明显的偏移，但其他饵料生物的生态位的位置和重叠度发生了一定变化，这或许与饵料生物摄食选择的季节差异有关；鱼类、虾类和头足类的营养生态位在不同采样时期分别表现出不同的重叠和分化特征，证明了不同饵料生物对食物选择的差异性。相关研究结果可为类似海域生物营养生态位的研究提供参考，也可为东海海域渔业资源的可持续开发利用和生态环境的保护提供科学资料。 |
| 关键词: 海洋生物学 碳氮稳定同位素 饵料生物 营养生态位 东海中南部 |
| DOI：10.3969/J.ISSN.2095-4972.2022.03.002 |
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| 基金项目:国家重点研发计划专项资助项目(2018YFC1406302) |
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| Variations in trophic niches of the food organisms in south-central East China Sea based on stable isotope signatures |
| ZHANG Hushun,SONG Puqing,ZHENG Xinqing,LIU Shigang,LI Yuan,WANG Xuehua,LIN Longshan |
| (College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;Third Institute of Oceanography, MNR, Xiamen 361005, China) |
| Abstract: |
| Food organisms play a key role between prey and predator in the marine ecosystem. Based on the stable isotope signatures, a study of seasonal trophic niche variation and inter-species competition of food organisms from south-central East China Sea was conducted in November 2018 and April 2019. Our study confirmed a wide range of stable isotope signatures, indicating a high level of food sources diversity and a stable nutrition structure in study area of south-central East China Sea. Significant variations were confirmed by δ13C and δ15N values of samples in addition to seasonal changed trophic levels. Moreover, our study verified the seasonal variations of trophic niches of fishes, shrimps, and cephalopods due to the environmental changes and dietary shifts. Our results provide evidence of the temporal variations of trophic niches in food organisms. And it is hoping that this research could provide a scientific basis for the sustainable exploitation of fishery resources and the protection of ecological environment in the East China Sea. |
| Key words: marine biology stable isotope of carbon and nitrogen food organism trophic niche south-central East China Sea |
