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宣思鹏, 陈新军, 林东明, 陈子末. 西南大西洋阿根廷滑柔鱼雄性个体的有效繁殖力特性研究[J]. 水生生物学报, 2018, 42(4): 800-810. DOI: 10.7541/2018.098
引用本文: 宣思鹏, 陈新军, 林东明, 陈子末. 西南大西洋阿根廷滑柔鱼雄性个体的有效繁殖力特性研究[J]. 水生生物学报, 2018, 42(4): 800-810. DOI: 10.7541/2018.098
XUAN Si-Peng, CHEN Xin-Jun, LIN Dong-Ming, CHEN Zi-Mo. THE EFFECTIVE FECUNDITY IN MALE ILLEX ARGENTINUS IN SOUTHWEST ATLANTIC OCEAN[J]. ACTA HYDROBIOLOGICA SINICA, 2018, 42(4): 800-810. DOI: 10.7541/2018.098
Citation: XUAN Si-Peng, CHEN Xin-Jun, LIN Dong-Ming, CHEN Zi-Mo. THE EFFECTIVE FECUNDITY IN MALE ILLEX ARGENTINUS IN SOUTHWEST ATLANTIC OCEAN[J]. ACTA HYDROBIOLOGICA SINICA, 2018, 42(4): 800-810. DOI: 10.7541/2018.098

西南大西洋阿根廷滑柔鱼雄性个体的有效繁殖力特性研究

THE EFFECTIVE FECUNDITY IN MALE ILLEX ARGENTINUS IN SOUTHWEST ATLANTIC OCEAN

  • 摘要: 对西南大西洋阿根廷滑柔鱼(Illex argentinus)雄性个体的有效繁殖力特性, 以及有效繁殖力与个体生长发育关系进行了研究。结果表明, 阿根廷滑柔鱼雄性个体的胴长、体重的生物学最小型分别为207.79 mm和162.55 g; 个体有效繁殖力为(374±280.33)条精荚, 胴长相对有效繁殖力为(179.18±117.66)条/mm; 精荚的平均长度为(21.57±4.17) mm, 是胴长的(10.22±1.82)%。随着性腺发育, 个体有效繁殖力和精荚长度均增长显著(P<0.05), 前者在功能性成熟期达到最大值, 为(811±181.34)条精荚; 后者在繁殖产卵期达到最大值, 为(23.89±3.87) mm。同时, 个体有效繁殖力和精荚长度均与胴长、体重呈显著的线性函数关系(P<0.05)。回归拟合数据集比较分析和多元线性回归分析显示, 个体有效繁殖力与胴长、体重之间的线性关系不存在显著性差异(P>0.05), 但是体重对个体有效繁殖力的影响更为显著(P<0.001); 精荚长度与胴长、体重之间的线性关系存在显著性差异(P<0.001), 并且胴长、体重两者对精荚长度具有一致的影响效应(P<0.001)。以上结果表明, 阿根廷滑柔鱼雄性个体随着性腺发育持续产生并存储精荚, 精荚长度也随之显著增加, 并且与个体大小密切相关。

     

    Abstract: Illex argentinus is one of the most important ommastrephid squids, due to its annual landing volume, and its key role as transient ‘biological pumps’ in southwest Atlantic ecosystem. In order to understand the fecundity characteristics of male ommastrephids, specimens of male I. argentinus, collected from December 2012 to March 2013, were used to analyze the fecundity and its relationship to reproductive development with biological statistics analysis. The results showed that the minimum biological size was 207.29 mm for mantle length (ML) and 162.55 g for body weight (BW). The effective fecundity (EF), defined as the sum of normal spermatophores in spermatophoric complex and spermatophoric sac, was in an average of (374±280.33) spermatophores. The mean value of relative effective fecundity by mantle length was (179.18±117.66) spermatophores per millimeter. The length of spermatophores (SL) varied from 6.34 to 33.14 mm, and its mean value was (21.57±4.17) mm, which was (10.22±1.82)% of mantle length. Both EF and SL significantly increased with the onset of sexual maturation (P<0.05). EF attained the maximum value at functionally maturity stage (Ⅵ), with a mean value of (811±181.34) spermatophores. SL increased up to the mating stage (Ⅶ), whereby it attained a mean value of (23.89±3.87) mm. Meanwhile, both EF and SL showed significantly linear relation with mantle length (EF=–581.92+4.56ML, R2=0.17, P<0.05;SL=5.77+0.075ML, R2=0.23, P<0.05) and body weight (EF=16.55+1.77BW, R2=0.37, P<0.05;SL=17.96+0.017BW, R2=0.17, P<0.05), indicating that individual with bigger size has larger EF and longer SL. Furthermore, the compare datasets of fitted model analysis revealed that there was no significant difference between the linear relationship of EF-ML and that of EF-BW (P>0.05). Based on multiple regression analysis, however, the influence on EF from body weight was more significant than that from mantle length (P<0.05). The compare datasets of fitted model analysis for SL showed that there was significant difference between the linear relationship of SL-ML and that of SL-BW (P<0.001), although the multiple regression analysis suggested a comparative influence on SL from both mantle length and body weight (P<0.001). These findings indicated that the EF of maleI. argentinus was a strategy of adaptability to its short lifespan by producing and accumulating spermatophores along with reproductive development and body growth, and the length of spermatophores will also increase with time.

     

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