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首页> 外文期刊>Marine ecology progress series >Biochemical adaptation by the tropical copepods Apocyclops royi and Pseudodiaptomus annandalei to a PUFA-poor brackish water habitat
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Biochemical adaptation by the tropical copepods Apocyclops royi and Pseudodiaptomus annandalei to a PUFA-poor brackish water habitat

机译：热带桡足类royi和pseudodiaptomus andandalei的生物化学适应royi和pseudodiaptomus andalei到普罗布氏般的咸水栖息地

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摘要

The cyclopoid Apocyclops royi (Lindberg 1940) and the calanoid Pseudodiaptomus annandalei (Sewell 1919) are 2 tropical copepods suspected of having the capability to biosynthesize the physiologically important n-3 polyunsaturated fatty acids (n-3 PUFAs) eicosapentaenoic acid (C20:5n-3, EPA) and docosahexaenoic acid (C22:6n-3, DHA). We demonstrated this suspected ability using C-13(18) alpha-linolenic acid (C18:3n-3, ALA) fed to the copepods through liposomes and a subsequent fatty acid (FA) analysis by GC-MS at 3 different time points (0, 24, and 48 h). Two different diets were applied post liposome exposure: baker's yeast Saccharomyces cerevisiae and the microalga Dunaliella tertiolecta. For both copepods, further elongated and desaturated C-13 n-3 PUFAs were found at all time points. At T-48h, A. royi and P. annandalei contained C-13-labelled DHA contents (+/- SD) of 1.3 +/- 0.2 and 0.7 +/- 0.3 mu g C-13-FA mgC(copepod)(-1) when fed baker's yeast, respectively, and 1.2 +/- 0.1 and 1.6 +/- 0.5 mu g C-13-FA mgC(copepod)(-1) when fed D. tertiolecta, respectively, with significant differences observed only between P. annandalei diet treatments. The C-13-labelled EPA content of A. royi and P. annandalei at T-48h was 0.6 +/- 0.4 and 0.7 +/- 0.4 mu g C-13-FA mgC(copepod)(-1) when fed baker's yeast and 0.8 +/- 0.2 and 0.3 +/- 0.1 mu g C-13-FA mgC(copepod)(-1) when fed D. tertiolecta, with significant differences only between copepods fed D. tertiolecta. A. royi and P. annandalei exhibited an ability to produce n-3 PUFAs from the precursor ALA in comparatively large quantities. This ability enables these 2 species to inhabit habitats characterized by PUFA-poor particulate material.
机译：ryi（Lindberg 1940）和Calanoid pseudodiaptomus annandalei（sewell 1919）是疑似疑似生物学的能力的2个热带桡足蛋白酶（N-3 pufas）eicosapentaeno酸（C20：5n- 3，EPA）和十二碳六烯酸（C22：6N-3，DHA）。我们用C-13（18）α-亚麻酸（C18：3N-3，ALA）证明了通过脂质体通过脂质体和随后的脂肪酸（FA）分析在3种不同的时间点（ 0,24和48小时）。脂质体暴露后两种不同的饮食：面包师的酵母酿酒酵母和微藻幼虫菌特切。对于两种桡足蛋白酶，在所有时间点都发现了进一步的细长和去饱和的C-13 N-3 PUFA。在T-48H，A.Royi和P. Annandalei含有C-13标记的DHA含量（+/- SD）为1.3 +/- 0.2和0.7 +/- 0.3 mu G C-13-Fa MGC（COPEPOD）（ -1）当贝克酵母的酵母分别和1.2 +/- 0.1和1.6 +/- 0.5 mu G c-13-Fa Mgc（Copepod）（Copepod）（CopePod）（ - 1）分别仅观察到显着差异在P. Annandalei饮食治疗之间。 T-48H的A.罗伊和P.Anandalei的C-13标记的EPA含量为0.6 +/- 0.4和0.7 +/- 0.4 mu G C-13-Fa MgC（CopePod）（ - 1）当美联储面包师酵母和0.8 +/- 0.2和0.3 +/-0.1μmgc-13-fa mgc（copepod）（copepod）（ - 1）当喂养d.tertiolecta，仅在Copepods D. tertiolecta之间具有显着差异。 A. Royi和P.Anandalei表现出从相对大量的前体ALA生产N-3 PUFA的能力。这种能力使这两个物种能够居住栖息地，其特征在于Pufa差的颗粒材料。

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