Fatty acid profiles in the gonads of the sea urchin Strongylocentrotus droebachiensis on natural algal diets
Fatty acid profiles in the gonads of the sea urchin Strongylocentrotus droebachiensis on natural algal diets
复制标题
DOI：
10.3354/meps07746
复制
发表时间：
2008-01-01
影响因子：
2.5
通讯作者：
Gagnon, Patrick
中科院分区：
文献类型：
--
作者：
Kelly, Jennifer R.;Scheibling, Robert E.;Gagnon, Patrick
我们研究了采自海带边缘放牧聚集区和以珊瑚藻类为主的荒地中的绿海胆Strongyloctrotus droebachiensis性腺的脂肪酸组成，以及实验室中投喂单一藻类饲料的海胆的性腺脂肪酸组成。我们将这些性腺脂肪酸与藻类饮食进行了比较，藻类饮食代表了岩石潮下生境中已知的海胆食物来源。从两种野生生境采集的海胆的性腺，以及在实验室饲养海带的海胆的性腺，比饲养单一饲料的无毛海藻(Agarum clathratum、珊瑚红藻或绿色Desmarestia viridis)的海胆含有更多的脂肪。海胆对非亚甲基中断的双烯和其他脂肪酸的大量生物合成显著影响了它们的整体脂肪酸特征。尽管实验室饲养的海胆的性腺脂肪酸组成与其饲料中的脂肪酸组成并不明显对应，但使用多维标度(PADS)在多维空间中区分了3类海胆：(1)实验室中投喂单一饲料的海胆；(2)实验室饲养或从放牧前线采集的海胆；(3)来自荒地的海胆。在贫瘠地区的海胆中发现的FA特征表明，它们的食物中存在底栖硅藻。我们的结果表明，虽然海胆性腺的FA信号受到食物的影响，并且可以在实验室和野外区分海胆的摄食组，但FAs的显著从头合成和/或修饰排除了海胆FA与它们的藻类饲料的对应关系。
We examined fatty acid (FA) compositions of gonads of the green sea urchin Strongylocentrotus droebachiensis collected from a grazing aggregation (front) at the edge of a kelp bed and from barrens dominated by coralline algae, and those of urchins fed single algal diets in the laboratory. We compared these gonad FAs with those of the algal diets, which represented known urchin food sources in rocky subtidal habitats. Gonads of urchins collected from both wild habitats, and of urchins fed kelp Saccharina longicruris in the laboratory, contained more lipid than did urchins fed single diets of barrens macroalgae (Agarum clathratum, coralline red algae or Desmarestia viridis). Substantial biosynthesis of non-methylene interrupted dienes and other FAs by urchins markedly affected their overall FA signatures. Although the FA compositions of gonads of laboratory-fed urchins did not clearly correspond with those of their diets, 3 clusters of urchins were distinguished in multivariate space using multidimensional scaling (PADS): (1) urchins fed single diets of barrens macroalgae in the laboratory; (2) urchins fed S. longicruris in the laboratory or collected from the grazing front; and (3) urchins from the barrens. Characteristics of FA signatures found in urchins from the barrens suggested the occurrence of benthic diatoms in their diet. Our results indicate that, while the FA signatures of urchin gonads are affected by diet and can be used to differentiate feeding groups of urchins in the laboratory and field, significant de novo biosynthesis and/or modification of FAs precludes correspondence of urchin FAs to those of their algal diets.