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Fatty acid composition of the postlarval daubed shanny (Leptoclinus maculatus) during the polar night
Polar Biology ( IF 1.7 ) Pub Date : 2020-04-23 , DOI: 10.1007/s00300-020-02669-4
Svetlana N. Pekkoeva , Svetlana A. Murzina , Zinaida A. Nefedova , Stig Falk-Petersen , Jørgen Berge , Ole J. Lønne , Nina N. Nemova

Recent discoveries of high levels of biological activity in the Arctic marine ecosystems during the polar night raise questions regarding the ecophysiology of the pelagic postlarval daubed shanny Leptoclinus maculatus. Of special interest is the composition of the lipid sac—a unique feature not found in other Arctic fishes. Analysis of the fatty acid content of major classes of lipids as membrane—total phospholipids (PL) and storage—triacylglycerols (TAG) in the different postlarvae stages during the polar night is presented in this work for the first time. A high level of monounsaturated fatty acids (MUFAs) (71–74% of the total fatty acids (FA) of TAG) was found in the TAG of the L3-L4* postlarvae stages, among which 20:1(n-9) (28%) and 22:1(n-11) (27–29%) FAs are trophic biomarkers of the zooplankton Calanus spp. Among the polyunsaturated FA (PUFA), the FAs of (n-3) class were dominated (22:6(n-3)—in the PL, and 18:4(n-3)—in the TAG). A decrease in the content of the saturated FA (SFA) and an increase in the MUFA in the structural PL during the transition from the postlarval to the demersal stage were observed. Our analyses of the FA composition of the lipid sac suggest that the fish continues to actively hunt for its preferred prey item Calanus spp. during the polar night.

中文翻译:

在极夜期间涂抹的虾苗(Leptoclinus maculatus)的脂肪酸组成

最近在极夜期间北极海洋生态系统中高水平生物活动的发现引发了有关涂抹 shanny Leptoclinus maculatus 的远洋后期幼体的生态生理学的问题。特别令人感兴趣的是脂囊的组成——这是其他北极鱼类所没有的独特特征。这项工作首次对极夜期间不同虾苗阶段的主要类脂(如膜总磷脂(PL)和储存三酰甘油(TAG))的脂肪酸含量进行了分析。在 L3-L4* 后期幼体阶段的 TAG 中发现了高水平的单不饱和脂肪酸 (MUFA)(占 TAG 总脂肪酸 (FA) 的 71-74%),其中 20:1(n-9) (28%) 和 22:1(n-11) (27–29%) FA 是浮游动物 Calanus spp 的营养生物标志物。在多不饱和脂肪酸(PUFA)中,(n-3)类的脂肪酸占主导地位(PL中为22:6(n-3),TAG中为18:4(n-3))。在从虾苗到底层阶段的过渡期间,观察到饱和 FA (SFA) 含量的减少和结构 PL 中 MUFA 的增加。我们对脂囊的 FA 组成的分析表明,这种鱼继续积极寻找其首选的猎物 Calanus spp。在极夜期间。我们对脂囊的 FA 组成的分析表明,这种鱼继续积极寻找其首选的猎物 Calanus spp。在极夜期间。我们对脂囊的 FA 组成的分析表明,这种鱼继续积极寻找其首选的猎物 Calanus spp。在极夜期间。
更新日期:2020-04-23
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