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首页> 外文期刊>Polar biology >Gonadal development in males of Notocrangon antarcticus (Decapoda: Caridea) from the Weddell Sea, Antarctica
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Gonadal development in males of Notocrangon antarcticus (Decapoda: Caridea) from the Weddell Sea, Antarctica

机译：南极韦德海的南极诺克兰公（十足目：Caridea）雄性的性腺发育。

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摘要

Our knowledge on reproductive traits of marine decapods is mainly based on studies concerning reproductive features of females, while the description of trends in reproductive cycles for males are scarce. Here, we analyzed the gonad development and the seasonal variation of the gonadosomatic index (GSI) of male Notocrangon antarcticus (N = 106; collected between 1986 and 1992; Weddell Sea), one of the most common caridean shrimp inhabiting the Antarctica. Male size ranged from 10.2 to 17.7 mm CL (carapax length), and individuals were significantly larger in autumn. The length of appendix masculina increased with male size, and there was no evidence for sex reversal, corroborating the assumption of dioceism inN. antarcticus. The average dry weight of the males was highest (mean 0.39) in autumn. The highest and lowest gonad dry weights were obtained from summer samples; however, we did not detect significant differences among seasons. The highest mean GSI was calculated for individuals collected in summer, and mean GSI was significantly different between summer-autumn and summer-spring, but not in autumn-spring. The GSI remained practically constant, independent of male CL. The size at sexual maturity was 13.8 mm CL, a size smaller than previously reported for N. antarcticus. The results obtained demonstrate that peak reproductive productivity of male N. antarcticus is during the summer months, when abundant nutritional resources are available.
机译：我们对海洋十足鱼类生殖特性的了解主要基于关于雌性生殖特征的研究，而对雄性生殖周期趋势的描述却很少。在这里，我们分析了南极雄性八爪鱼（N = 106； 1986年至1992年间；韦德海）收集的性腺发育和性腺体激素指数（GSI）的季节性变化，这是一种生活在南极洲的最常见的ide虾。雄性大小从10.2至17.7毫米CL（腕骨长度）不等，秋季个体明显更大。男性阑尾的长度随着男性的大小而增加，并且没有性别逆转的证据，从而证实了白痴症在N中的假设。南极。秋季，雄性的平均干重最高（平均0.39）。从夏季样品获得最高和最低的性腺干重；但是，我们没有发现季节之间的显着差异。计算了夏季采集的个体的最高GSI平均值，并且在夏季-秋季和夏季-春季之间，平均GSI显着不同，但在秋季-春季之间没有显着差异。 GSI几乎保持恒定，与雄性CL无关。性成熟时的大小为CL 13.8 mm，比先前报道的南极猪笼草的大小小。所获得的结果表明，南极猪笼草的繁殖力峰值是在夏季，那里有丰富的营养资源。

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  • 来源
    《Polar biology》 |2011年第5期|p.707-713|共7页
  • 作者

    Marco A. Lardies; Ingo S. Wehrtmann;

  • 作者单位

    Departamento de Ciencias, Facultad de Artes Liberates and Facultad de Ingenieria y Ciencias, Universidad Adolfo Ibanez, Av. Diagonal Las Torres 2640, Peiialolen, Santiago, Chile;

    Unidad de Investigation Pesquera y Acuicultura (UNIP) of the Centra de Investigacion en Ciencias del Mar y Limnologia (CIMAR), Universidad de Costa Rica, 2060 San Jose, Costa Rica,Escuela de Biologia, Universidad de Costa Rica, 2060 San Jose, Costa Rica;

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  • 正文语种 eng
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  • 关键词

    reproduction; gonadosomatic index; sexual maturity; caridean shrimp; appendix masculina; seasonal variation; weddell sea;

    机译：再生产;性腺体指数性成熟;卡里丹虾阑尾炎季节性变化;韦德尔海;

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