基于耳石Sr同位素反演鄱阳湖刀鲚出生起源及早期发育阶段生境履历的初步研究
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作者:
作者单位:

1.中国水产科学研究院淡水渔业研究中心, 农业农村部淡水渔业和种质资源利用重点实验室, 江苏 无锡 214081 ; 2.南京农业大学, 无锡渔业学院, 江苏 无锡 214081

作者简介:

轩中亚(1990-),男,博士,研究方向为渔业资源保护.E-mail:2017213002@njau.edu.cn

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中图分类号:

S931

基金项目:

江西省重点水域长颌鲚重要栖息地调查项目(NY2022-C0901); 鄱阳湖水生生物资源监测项目.


Preliminary study for using otolith 87Sr/86Sr to track the natal origin and reconstructing the early life history habitats of Coilia nasus from the Poyang Lake
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Affiliation:

1.Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081 , China ; 2.Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081 , China

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    摘要:

    目前通过耳石Sr/Ca比值可以确定刀鲚(Coilia nasus)经历淡水、河口及海洋的洄游生活史, 然而在追溯刀鲚个体的出生起源及早期发育阶段淡水生境履历转变方面仍存在困难。为探索新的追溯鄱阳湖中刀鲚的孵化场来源及早期生活史中不同淡水栖息地转变的方法, 利用激光剥蚀连接多接收电感耦合等离子体质谱(LA-MC-ICP-MS) 技术, 分析了 2023 年 7—8 月采自鄱阳湖都昌水域的 10 尾刀鲚(Coilia nasus)成鱼个体以及 3 尾短颌鲚(Coilia brachygnathus)成鱼矢耳石的锶同位素(87Sr/86Sr)组成特征。从耳石核心到边缘的87Sr/86Sr线分析结果显示, 3尾短颌鲚的耳石87Sr/86Sr 比值变化不大, 在 0.71448 附近波动, 反映了其鄱阳湖定居生活史; 9 尾刀鲚核心附近 87Sr/86Sr 值接近0.71448, 显示其孵化自鄱阳湖, 并“回归”至出生栖息地鄱阳湖, 其中4 尾个体在仔稚鱼阶段迁出鄱阳湖, 5 尾个体在幼鱼阶段迁出; 1尾刀鲚耳石核心附近87Sr/86Sr比值平均值为0.71078, 显示为长江干流出生, 在上溯洄游的过程中没有回到出生栖息地, 而是进入了非出生栖息地鄱阳湖。这些结果反映了耳石 87Sr/86Sr 比值作为鄱阳湖刀鲚产卵场地理标志和区分鄱阳湖与长江干流生活史方面的客观性、准确性和稳定性, 初步显示了其作为刀鲚出生起源和生境自然标签的潜力, 也初步表明了鄱阳湖刀鲚早期个体迁出鄱阳湖时机的多样性。

    Abstract:

    Coilia nasus, a historically significant fish species in the Yangtze River, has experienced a significant decline because of overfishing and habitat degradation. As an anadromous fish, C. nasus traverses different habitats over large geographic areas, making effective conservation difficult. Tracing their natal origin and lifelong habitat useage at the individual and population levels will enhance our ability to protect critical habitats of this anadromous fish. The migratory life history of C. nasus across freshwater, estuarine, and marine environments can be determined by analyzing otolith Sr/Ca ratios. However, difficulties remain in tracking their natal origins and identifying transitions between freshwater habitats during the early stages of their development. The use of otolith 87Sr/86Sr isotopic ratios offers a robust approach for tracing the natal origins and migration patterns of C. nasus. The Sr isotope (87Sr/86Sr) composition of the otoliths was analyzed using laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) to confirm the hatching grounds and life histories of C. nasus in the Poyang Lake. In July and August 2023, a total of ten adult C. nasus and three adult C. brachygnathus were collected from the Duchang area of the Poyang Lake, Jiangxi Province, China. The otolith 87Sr/86Sr profiles from the core to the edge displayed minor fluctuations of approximately 0.71448, indicating that the three C. brachygnathus individuals reside in the Poyang Lake. The 87Sr/86Sr ratio of the otolith core region of nine C. nasus was close to 0.71448, indicating that they hatched in the Poyang Lake and subsequently returned to the lake (because they were caught in the Poyang Lake). Among these individuals, four migrated out of the Poyang Lake during their larval stage and five migrated during their juvenile stage. One individual exhibited an average 87Sr/86Sr ratio of 0.71078 in its first segment, suggesting that it was born in the main channel of the Yangtze River and then strayed into Poyang Lake after its sea life history. The results demonstrated the objectivity, accuracy, and stability of otolith 87Sr/86Sr ratio as a reliable geographical indicator for identifying the natal origin of C. nasus in the Poyang Lake. Furthermore, these findings shed light on habitat shifts between the Poyang Lake and the main Yangtze River channel, emphasizing the diverse timing of early life migration from the Poyang Lake. Consequently, despite being a preliminary study, this study demonstrates the potential of using Sr isotopes to distinguish between natal origins and freshwater habitats. This approach is significant within the context of a decade-long fishing prohibition in the Yangtze River, as it facilitates the assessment of species recovery and management while contributing to broader ecological and conservation insights.

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轩中亚,杨彦平,华忠,马凤娇,王银平,刘凯.基于耳石Sr同位素反演鄱阳湖刀鲚出生起源及早期发育阶段生境履历的初步研究[J].中国水产科学,2024,31(10):1218-1229
XUAN Zhongya, YANG Yanping, HUA Zhong, MA Fengjiao, WANG Yinping, LIU Kai. Preliminary study for using otolith 87Sr/86Sr to track the natal origin and reconstructing the early life history habitats of Coilia nasus from the Poyang Lake[J]. Journal of Fishery Sciences of China,2024,31(10):1218-1229

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  • 收稿日期:2024-05-10
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  • 在线发布日期: 2025-01-02
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