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首页> 外文期刊>Marine biology >Seasonal lipid dynamics of the copepods Pseudocalanus minutus (Calanoida) and Oithona similis (Cyclopoida) in the Arctic Kongsfjorden (Svalbard)
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Seasonal lipid dynamics of the copepods Pseudocalanus minutus (Calanoida) and Oithona similis (Cyclopoida) in the Arctic Kongsfjorden (Svalbard)

机译：co足类P（Calanoida）和O猴Oithona similis（Cyclopoida）在北极孔斯峡湾（斯瓦尔巴特群岛）的季节性脂质动力学

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摘要

Seasonal lipid dynamics of various developmental stages were investigated in Pseudocalanus minutus and Oithona similis. For P. minutus, the dominance of 16:1(n-7), 16:4(n-3) and 20:5(n-3) fatty acids indicated a diatom-based nutrition in spring, whereas 22:6(n-3), 16:0, 18:2(n-6) and 18:1(n-9) pointed to a flagellate-based diet during the rest of the year as well as omnivorous/carnivorous low-level feeding during winter. The shorter-chain fatty alcohols 14:0 and 16:0 prevailed, also reflecting biosynthetic processes typical of omnivores or carnivores. Altogether, the lipid signatures characterized P. minutus as an opportunistic feeder. In contrast, O. similis had consistently high amounts of the 18:1(n-9) fatty acid in all stages and during all seasons pointing to a generally omnivorous/carnivorous/detritivorous diet. Furthermore, the fatty alcohol 20:1(n-9) reached high percentages ..especially in adult females and males, and feeding on Calanus faecal pellets is suggested. Fatty alcohols, as wax ester moieties, revealed significant seasonal variations in O. similis and a seasonal trend towards wax ester accumulation in autumn in P. minutus. P. minutus utilized its lipid deposits for development in the copepodite stages Ⅲ and Ⅳ and for gonad maturation in CV and females during the dark season. However, CVs and females depended on the spring phytoplankton bloom for final maturation processes and reproduction. O. similis fueled gonad maturation and egg production for reproduction in June by wax esters, whereas reproduction in August/September co-occurred with the accumulation of new depot lipids. Both species revealed significantly higher wax ester levels in deeper ( > 50 m) as compared to surface (0-50 m) dwelling individuals related to a descent prior to overwintering.
机译：在Pseudocalanus minutus和Oithona similis中研究了各个发育阶段的季节性脂质动力学。对于小菜蛾（P. minutus），以16：1（n-7），16：4（n-3）和20：5（n-3）脂肪酸为主，表明春季以硅藻为基础的营养，而22：6（ n-3），16：0、18：2（n-6）和18：1（n-9）指出，在今年剩余的时间里以鞭毛为基础的饮食，以及在此期间的杂食/食肉低水平喂养冬季。较短链的脂肪醇14：0和16：0盛行，也反映了杂食动物或食肉动物的典型生物合成过程。总的来说，脂质特征将小肠小球菌表征为机会饲养者。相比之下，stages麦在所有阶段和所有季节中始终具有较高的18：1（n-9）脂肪酸含量，这表明通常是杂食/肉食/有害的饮食。此外，脂肪醇20：1（n-9）的含量很高，特别是在成年雌性和雄性中，建议以卡努斯粪便颗粒为食。脂肪醇，作为蜡酯部分，揭示了O. similis的明显季节性变化，并在秋季在小球藻中形成了蜡酯积累的季节性趋势。小菜蛾利用其脂质沉积物在谷足类动物第三和第四阶段发育，并在黑暗季节使简历和雌性中的性腺成熟。但是，CV和雌性最终繁殖过程取决于春季浮游植物的开花。 O. similis促进了性腺的成熟和卵的生产，6月通过蜡酯繁殖，而8月/ 9月的繁殖则伴随着新的贮库脂质的积累。与越冬前有血统的地表居民（0-50 m）相比，这两个物种在更深的地方（> 50 m）都显示出较高的蜡酯含量。

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  • 来源
    《Marine biology》 |2007年第3期|p.443-454|共12页
  • 作者

    Silke Lischka; Wilhelm Hagen;

  • 作者单位

    Institute for Polar Ecology, Kiel University, Wischhofstrasse 1-3, Building 12, 24148 Kiel, Germany;

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  • 正文语种 eng
  • 中图分类 环境生物学;
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