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首页> 外文期刊>Polar biology >Lipid dynamics and feeding of dominant Antarctic calanoid copepods in the eastern Weddell Sea in December
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Lipid dynamics and feeding of dominant Antarctic calanoid copepods in the eastern Weddell Sea in December

机译：十二月韦德海东部优势南极cal足类co足类动物的脂质动态和摄食

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摘要

Lipid content, fatty acid composition, and feeding activity of the dominant Antarctic copepods, Calanoides acutus, Calanus propinquus, and Metridia ger-lachei, were studied at a quasi-permanent station in the eastern Weddell Sea in December 2003. During 3 weeks of the spring phytoplankton development, total lipid levels of females and copepodite stages V (CVs) of C. acutus were almost doubled. Meanwhile, only a slight increase in total lipid content occurred in M. gerlachei, and no clear trend was observed in lipids of C. propinquus females. The pronounced increase of lipids in C. acutus was due to an accumulation of wax esters. The proportion of wax esters in the lipids of M. gerlachei was clearly lower, while triacylglyce-rols played a more important role. In C. propinquus, tria-cylglycerols were the only neutral lipid class. There were no pronounced changes in the feeding activity of M. gerlachei, whereas the feeding activity of C. acutus had rapidly increased with the development of the phytoplankton bloom in December, which explains its rapid lipid accumulation. The combination of gut content and fatty acid trophic marker analyses showed that C. acutus was feeding predominantly on diatoms. The typical diatom fatty acidrnmarker, 16:1(n-7), slightly decreased and the tracer for flagellates, 18:4(n-3), increased in females and CVs of C. acutus. This shift indicates the time, when the significance of flagellates started to increase. The three copepod species exhibited different patterns of lipid accumulation in relation to their trophic niches and different duration of their active phases. The investigations filled a crucial data gap in the seasonal lipid dynamics of dominant calanoid copepods in the Weddell Sea in December and support earlier hypotheses on their energetic adaptations and life cycle strategies.
机译：2003年12月，在东部韦德海的一个准永久性站对南极co足类主要Cal足类，卡拉诺伊奇人，Calanus propinquus和Metridia ger-lachei的脂质含量，脂肪酸组成和摄食活性进行了研究。春季浮游植物的发育，雌性总脂质水平和a鱼的V足足石阶段V（CVs）几乎翻了一番。同时，gerlachei的总脂质含量仅略有增加，而在原产于C. propinquus雌性的脂质中未观察到明显的趋势。黄cut鱼中脂质的明显增加是由于蜡酯的积累。蜡酯在Gerlachei脂质中的比例明显较低，而三酰甘油-油起着更重要的作用。在丙酸梭菌中，三甘油基甘油是唯一的中性脂质类别。 gerlachei的摄食活动没有明显变化，而随着浮游植物绽放在12月的发展，a鱼的摄食活动迅速增加，这说明其迅速的脂质蓄积。肠道含量和脂肪酸营养标志物分析的结合表明，金龟子主要以硅藻为食。典型的硅藻脂肪酸标记物16：1（n-7）略有降低，鞭毛虫的示踪剂18：4（n-3）在女性和C. Acutus的CV中增加。该偏移指示鞭毛的重要性开始增加的时间。三种co足类物种相对于其营养位和活跃期的持续时间表现出不同的脂质积累方式。这些调查填补了12月在韦德尔海中主要cal类co足类动物的季节性脂质动态中的关键数据缺口，并支持了有关其能量适应性和生命周期策略的早期假设。

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