文章摘要
北太平洋2种鱿鱼类角质颚生长特性及其种类判别
Beak’s growth characteristics and species identification for two kinds of squids in the North Pacific Ocean
投稿时间:2020-06-20  修订日期:2020-09-10
DOI:
中文关键词: 柔鱼  北方拟黵乌贼  角质颚  生长  种类判别
英文关键词: Ommastrephes bartramii  Gonatopsis borealis  beak  growth  species identification
基金项目:国家重点研发计划(2019YFD0901404);大洋渔业资源可持续发展重点实验室开放课题(A1-2006-00-301110)资助
作者单位邮编
梁佳伟 上海海洋大学 201306
陈新军 上海海洋大学 201306
陆化杰 上海海洋大学 201306
胡贯宇 上海海洋大学 201306
方舟 上海海洋大学 201306
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中文摘要:
      柔鱼(Ommastrephes bartramii)和北方拟黵乌贼(Gonatopsis borealis)分布在北太平洋冷暖水交汇区,它们均为大型海洋动物的食物,其角质颚残留在捕食者的胃中,因此研究角质颚的生长特性可为种类判别提供科学依据。为此,本研究根据2018年9~11月中国鱿钓船在北太平洋海域(154°05′~159°43′E,41°05′~43°45'N)采集的柔鱼和北方拟黵乌贼样本,对以上两个种类的胴长(mantle length,ML)、体质量(body mass,BM)以及12个角质颚的形态学参数进行分析,研究了它们角质颚的生长特性。结果显示,两个种类在胴长和体质量上均存在极显著差异(P <0.01)。主成分分析认为,上脊突长(UCL)最适合用来代表柔鱼角质颚的外部形态特征,上脊突长和下侧壁长(LLWL)最适合用来代表北方拟黵乌贼角质颚的外部形态特征。赤池信息量准则(Akaike’s information criterion,AIC)认为,柔鱼上头盖长(UHL)、下头盖长(LHL)、LLWL、下翼长(LWL)与胴长适合幂函数表示,UCL、上侧壁长(ULWL)、上翼长(UWL)、下脊突长(LCL)与胴长适合对数函数表示;北方拟黵乌贼的UHL、下喙长(LRL)和LLWL与胴长适合幂函数表示,UCL和LCL与胴长适合指数函数表示,上喙长(URL)、ULWL和LHL适合对数函数表示。逐步判别分析显示,上、下角质颚的判别正确率分别为92.70%和84.50%,并建立了判别方程,研究认为角质颚外部形态可较好地应用于两种头足类的判别。
英文摘要:
      Ommastrephes bartramii and Gonatopsis borealis are distributed in the confluence of cold and warm water mass in the North Pacific Ocean, they are important preys for large marine animals, and their beaks are remained in the stomachs of their predators. Therefore, studying the growth characteristics of their beaks can provide a scientific basis for species identification. In this study, the samples of O.bartramii and G.borealis were collected by the Chinese squid jigging vessels during September to November in 2018 in the high seas of North Pacific Ocean (154°05′~159°43′E,41°05′~43°45'N). Their beaks’ characteristics were measured and analyzed. The results showed that the two species had extremely significant differences in mantle length and body mass(P < 0.01). The principal component analysis showed that upper crest length (UCL) was best for representing the beaks’ external morphological features of O.bartramii, upper crest length (UCL) and lower lateral wall length (LLWL) were best for representing the beaks’ external morphological features of G.borealis. The AIC (Akaike's information criterion) showed that the relationships between ML and UHL, LHL, LLWL, LWL were best described by power function for O.bartramii, and relationships between ML and UCL, ULWL, UWL, LCL were best described by logarithm function for O.bartramii; Relationships between ML and UHL, LRL and LLWL were best described by power function for G.borealis,relationships between ML and UCL and LCL were best described by exponential function for G.borealis, and relationships between ML and URL, ULWL and LHL were best described by logarithm function for G.borealis. Stepwise discriminant analysis showed that the correct rates of upper and lower beaks were 92.70% and 84.50%, respectively. Meanwhile, the discriminant functions were built in this study. The results indicated that the external shape of beaks can be effective to identify these two kinds of squids.
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