极地研究

极地研究 ›› 2022, Vol. 34 ›› Issue (3): 303-310.DOI: 10.13679/j.jdyj.20210062

• 研究论文 • 上一篇    下一篇

东南极凯尔盖朗群岛与克洛泽岛小鳞犬牙南极鱼群体耳石形态初步分析

杨丹1,2  方倩1  魏联1,2  朱国平1,2,3,4   

  1. 1上海海洋大学海洋科学学院, 上海 201306; 
    2上海海洋大学极地研究中心, 上海 201306; 
    3大洋渔业资源可持续开发教育部重点实验室, 极地海洋生态系统研究室, 上海 201306; 
    4国家远洋渔业工程技术研究中心, 上海 201306

  • 收稿日期:2021-07-21 修回日期:2021-10-28 出版日期:2022-09-28 发布日期:2022-09-28
  • 通讯作者: 朱国平
  • 作者简介:杨丹, 女, 1997年生。硕士研究生, 主要从事海洋生物学研究。E-mail: yangdan9797@163.com
  • 基金资助:
    国家留学基金委员会促进与加拿大、澳大利亚、新西兰及拉美地区科研合作与高层次人才培养项目(2021-109)、中国科学技术协会双边学术交流活动项目(2020ZZGJB060926)、国家自然科学基金项目(41776185)和国家重点研发计划项目(2018YFC1406801)资助

Preliminary analysis of otolith morphology of Patagonian toothfish (Disso-stichus eleginoides) from the Kerguelen and Crozet Islands, East Antarctic

Yang Dan1, 2, Fang Qian1, Wei Lian1, 2, Zhu Guoping1, 2, 3, 4   

  1. 1College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;
    2Center for Polar Research, Shanghai Ocean University, Shanghai 201306, China;
    3Polar Marine Ecosystem Group, The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China;
    4National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China

  • Received:2021-07-21 Revised:2021-10-28 Online:2022-09-28 Published:2022-09-28

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摘要： 耳石外型分析已广泛用于鱼类种群识别, 而东南极克洛泽岛与凯尔盖朗群岛的小鳞犬牙南极鱼(Dissostichus eleginoides)被认为存在两个不同的地理种群。由此, 本研究利用6个耳石形状指标(形态因子、圆度、环率、矩形趋近率、椭圆率和幅形比)和椭圆傅里叶系数对凯尔盖朗群岛与克洛泽岛的小鳞犬牙南极鱼耳石外型进行描述和分析。分析前, 首先排除个体异速生长效应对耳石形态造成的影响, 再应用主成分分析选取后续判别分析的成分。基于形状指标和椭圆傅立叶系数相结合的耳石外型判别分析结果显示, 判别成功率为80.00%。来自凯尔盖朗群岛与克洛泽岛的小鳞犬牙南极鱼耳石外型整体形态相似, 但耳石外部轮廓存在着细微差异。结合以往的遗传学结论和标志放流结果, 耳石外型研究可以初步推断, 克洛泽群岛和凯尔盖朗群岛之间存在种群交换, 但因为两个区域之间的交换比例和机制尚不清楚, 需利用多种分析方法, 如耳石微化学、标志放流等作进一步阐述和补充。

关键词: 小鳞犬牙南极鱼, 耳石外型, 形状指标, 椭圆傅里叶分析, 判别分析

Abstract: Otolith shape analysis has been widely used for stock discrimination. To examine population exchange between stocks in the East Antarctic, we computed six otolith shape indices (form factor, roundness, circularity, rectangularity, ellipticity, and aspect ratio) and elliptic Fourier coefficients for Dissostichus eleginoides from the Kerguelen Islands and the Crozet Islands. Prior to analysis, the influence of individual allometric effect on otolith shape was excluded. Principal component analysis was applied to select the components for subsequent discriminant analysis. We combined the shape indices with the elliptic Fourier coefficients and conducted a discriminant analysis, which had a success rate of 80.00% in the classification of our data. The otolith shape of D. eleginoides from the Kerguelen Islands are similar to those from the Crozet Islands; there are slight differences occur in between the outer edges of the otoliths from the two areas. Otolith shape analysis results and tagging and genetic data from previous studies support a preliminary inference of a population exchange between D. eleginoides from the Crozet Islands and those from the Kerguelen Islands. To elucidate the proportion and mechanisms of stock exchange between two areas, multiple approaches, including otolith chemistry and tagging, are needed.

Key words:  Dissostichus eleginoides, otolith shape, shape indices, elliptical Fourier analysis, discriminant analysis