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首页> 外文期刊>Aquatic Sciences >Seston fatty acid composition and copepod RNA:DNA ratio with respect to the underwater light climate in fluvial Lac Saint-Pierre
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Seston fatty acid composition and copepod RNA:DNA ratio with respect to the underwater light climate in fluvial Lac Saint-Pierre

机译：相对于河床圣皮埃尔的水下光气候，塞斯顿脂肪酸组成和co足类RNA：DNA比率

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摘要

The relationship between the underwater light availability at different wavelengths (from 351 to 700 nm) and the fatty acid (FA) composition of seston, as well as the trophic transfer of fatty acids from producers to consumers and its influence on copepod growth condition, were investigated throughout fluvial Lac Saint-Pierre (Quebec, Canada). Seston and zooplankton were collected at 11 sampling sites located within distinct water masses discriminated according to their underwater spectral characteristics. Diffuse light attenuation coefficients (Kd(λ)) varied among sampling sites and wavelengths (X) and were negatively correlated to seston composition in some essential fatty acids. Particularly, the relationships between Kd(λ) and the seston concentration in 20:5n3 and 22:6n3 differed and were wavelength dependent, being stronger for λ close to the absorption maxima of chlorophyll a, suggesting a potential link with photosynthetic processes. The concentrations of 16:ln7, 18:3n3 and 20:5n3 in copepods were strongly correlated to those in the seston, which points towards the trophic transfer of these fatty acids between primary producers and herbivorous consumers. Moreover, the growth condition of copepods, as expressed by their RNA:DNA ratio, was correlated to the concentrations of 16:1 n7,18:3n3 and 20:5n3 in the seston and in copepods. Our field study sheds light on the potential importance, yet to be precised, of specific wavelengths as a driver of Lac Saint-Pierre's productivity through their influence on fatty acids composition of seston and its nutritional quality for primary consumers.
机译：水下光在不同波长（351至700 nm）的可利用性与芝麻脂肪酸（FA）组成之间的关系，以及脂肪酸从生产者到消费者的营养转移及其对co足类动物生长条件的影响，分别为在整个河流Lac Saint-Pierre（加拿大魁北克）进行了调查。在根据水下光谱特征区分的不同水团中的11个采样点收集了塞斯顿和浮游动物。漫射光衰减系数（Kd（λ））在采样点和波长（X）之间变化，并且与某些必需脂肪酸中的芝麻素含量呈负相关。特别是，Kd（λ）与20：5n3和22：6n3中的硒浓度之间的关系不同，并且与波长有关，对于接近叶绿素a吸收最大值的λ更强，表明与光合作用过程有潜在的联系。 co足类动物中16：ln7、18：3n3和20：5n3的浓度与seston中的浓度密切相关，这表明这些脂肪酸在初级生产者和草食性消费者之间进行营养转移。此外，以pe足类动物的RNA：DNA比率表示的the足类动物的生长状况与其在ston和co足类动物中16：1 n7、18：3n3和20：5n3的浓度相关。我们的实地研究揭示了特定波长作为拉克圣皮埃尔（Lac Saint-Pierre）生产力的驱动力的潜在重要性，但尚未精确化，因为它们对芝麻素的脂肪酸组成及其营养品质的影响，对主要消费者而言。

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  • 来源
    《Aquatic Sciences》 |2012年第3期|p.539-553|共15页
  • 作者

    Julien Pommier; Jean-Jacques Frenette; Philippe Massicotte; Jean-Francois Lapierre; Helene Glemet;

  • 作者单位

    Departement de Chimie-Biologie, Universite du Quebec a Trois-Rivieres, C.P. 500, Trois-Rivieres,Quebec G9A 5H7, Canada,Institut de Radioprotection et de Surete Nucleaire, Laboratoire de Radioecologie de Cherbourg-Octeville, rue Max-Pol Fouchet, B.P. 10, 50130 Cherbourg-Octeville, France;

    Departement de Chimie-Biologie, Universite du Quebec a Trois-Rivieres, C.P. 500, Trois-Rivieres,Quebec G9A 5H7, Canada;

    Departement de Chimie-Biologie, Universite du Quebec a Trois-Rivieres, C.P. 500, Trois-Rivieres,Quebec G9A 5H7, Canada;

    Departement des sciences biologiques, Universite du Quebec a Montreal, C.P. 8888, Succ. Centre Ville, Montreal, QC H3C 3P8, Canada;

    Departement de Chimie-Biologie, Universite du Quebec a Trois-Rivieres, C.P. 500, Trois-Rivieres,Quebec G9A 5H7, Canada;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fatty acids; RNA/DNA ratio; underwater light climate; seston; copepod;

    机译：脂肪酸;RNA / DNA比率;水下轻气候塞斯顿pe足类;

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