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Comparative lipid dynamics of euphausiids from the Antarctic and Northeast Pacific Oceans

机译：来自南极太平洋和东北太平洋的粉金鱼的比较脂质动力学

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摘要

To better understand the feeding and reproductive ecology of euphausiids (krill) in different ocean environments, lipid classes and individual lipid components of four different species of euphausiids from Northeast Pacific (temperate species) and Southern Ocean (Antarctic species) were analyzed in animals from multiple life stages and seasons. The dominant krill species in the Northeast Pacific Euphausia pacifica and Thysanoessa spinifera, were compared to the two major Antarctic species, Euphausia superba and E. crystallorophias. Analysis comprised total lipid and lipid classes together with individual fatty acid and sterol composition in adults, juveniles, and larvae. Antarctic krill had much higher lipid content than their temperate relatives (10-50 and 5-20% of dry mass for Antarctic and temperate species, respectively) with significant seasonalrnvariations observed. Phospholipids were the dominant lipid class in both temperate krill species, while neutral storage lipids (wax esters and triacylglycerols for E. crystallorophias and E. superba, respectively) were the major lipid class in Antarctic krill and accounted for up to 40% of the total lipid content. Important fatty acids, specifically 16:0, 18:1ω9, 20:5ω3, and 22:6ω3, were detected in all four krill species, with minor differences between species and seasons. Detailed lipid profiles suggest that krill alter their lipid composition with life stage and season. In particular, larval Antarctic krill appear to utilize alternate food resources (i.e., sea-ice associated organisms) during austral winter in contrast to juveniles and adults (i.e., seston and copepods). Lipid dynamics in krill among krill in both systems appear closely linked to their life cycle and environmental conditions including food availability, and can provide a more complete comparative ecology of euphausiids in these environmentally distinct systems.
机译：为了更好地了解磷虾在不同海洋环境中的摄食和生殖生态，对来自东北太平洋（温带物种）和南洋（南极物种）的四种不同物种的虾类的脂类和单个脂质成分进行了分析。人生阶段和季节。将东北太平洋太平洋紫杉和Thysanoessa spinifera的主要磷虾物种与两个主要南极物种-紫杉和E. crystallorophias进行了比较。分析包括成年人，少年和幼虫中的总脂质和脂质类别以及个别脂肪酸和固醇成分。南极磷虾比其温带亲戚具有更高的脂质含量（南极和温带物种的干重分别为干重的10-50％和5-20％），并且观察到明显的季节性变化。在两种温带磷虾种类中，磷脂都是主要的脂质类别，而中性贮藏脂质（分别为南极磷虾和超级大肠杆菌的蜡酯和三酰基甘油）是南极磷虾的主要脂质类别，占总量的40％脂质含量。在所有四个磷虾种类中都检测到重要的脂肪酸，特别是16：0、18：1ω9、20：5ω3和22：6ω3，种类和季节之间的差异很小。详细的脂质概况表明，磷虾会随着生命阶段和季节而改变其脂质组成。尤其是，南极磷虾幼虫似乎在南方冬季期间利用替代食物资源（即与海冰有关的生物），而与少年和成年人（即塞斯顿和ston足类）相反。两种系统中的磷虾中，磷虾中的脂质动力学似乎与其生命周期和环境条件（包括食物供应量）紧密相关，并且可以在这些环境不同的系统中提供更完整的磷虾的比较生态学。

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  • 来源
    《Marine biology》 |2009年第7期|1459-1473|共15页
  • 作者

    Se-Jong Ju; Hyung-Ku Kang; Woong Seo Kim; H. Rodger Harvey;

  • 作者单位

    Deep-sea and Marine Georesources Research Department, Korea Ocean Research and Development Institute, P.O. Box 29, Ansan, Seoul 425-600, Republic of Korea;

    Marine Living Resources Research Department, Korea Ocean Research and Development Institute, P.O. Box 29. Ansan, Seoul 425-600, Republic of Korea;

    Yeosu Exposition Supporting Task Force Team, Korea Ocean Research and Development Institute, P.O. Box 29, Ansan, Seoul 425-600, Republic of Korea;

    Chesapeake Biological Laboratory, The University of Maryland Center for Environmental Science, P.O. Box 38, Solomons, MD 20688, USA;

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