Lipid and fatty acid compositions of stream periphyton and stoneroller minnows (Campostoma anomalum) : trophic and environmental implications
Lipid and fatty acid compositions of stream periphyton and stoneroller minnows (Campostoma anomalum) : trophic and environmental implications
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溪流附生生物和石鲦鱼（Campostoma anomalum）的脂质和脂肪酸组成：营养和环境影响
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
A. Luttrell
中科院分区：
文献类型：
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作者：
G. Napolitano;N. C. Shantha;W. Hill;A. Luttrell
对田纳西州东部三条溪流（东叉杨溪、欣兹溪和白橡溪）的草食性米诺鱼（Campostoma anomalum）及其主要食物（附生生物）的脂质和脂肪酸进行了分析。利用脂肪酸标记来探索鱼类与其藻类食物之间的营养关系。 C. anomalum 是富含脂质的鱼类，具有吸收疏水性污染物的高潜力。米诺鱼尸体的平均脂肪含量为湿重的 6.5%，消化道的脂肪含量为 26.5%。鱼体和内脏中多氯联苯（PCB）的浓度与这些身体部分的脂质含量成正比。对肠道内附生生物的显微镜检查和脂肪酸标记物的分析表明，东叉白杨溪的米诺鱼摄入的附生生物以绿藻为主（摄入的藻类生物量约90%来自叶绿藻）。 East Fork Poplar Creek 中米诺内脏的脂肪酸谱（包括其肠道内容物）及其脂质储存也反映了对绿藻的广泛摄入，其脂肪酸标记物 α-亚麻酸 (18:3ω3) 含量丰富，占总脂肪酸的 13%。 Hinds Creek 和 White Oak Creek 的附生生物中硅藻生物量相对较低，硅藻特征脂肪酸（二十碳五烯酸，20:5ω3）浓度相应较低。然而，对米诺鱼肠道内容物的分类学和脂质分析表明，在白橡溪，硅藻在米诺鱼的饮食中所占的比例异常大。这条溪流中的附生生物部分与 C. anomalum 的肠道内容物之间的脂肪酸谱差异表明，米诺鱼并没有平等地消耗附生生物的所有部分。这些结果强调了脂肪酸分析在揭示水生生态系统中的营养联系方面的适用性。
Lipids and fatty acids were analyzed in the herbivorous minnow (Campostoma anomalum) and its predominant food (periphyton) in three streams in eastern Tennessee (East Fork Poplar Creek, Hinds Creek and White Oak Creek). Fatty acid markers were used to explore the trophic relationship between the fish and its algal food. C. anomalum are lipid-rich fish, with a high potential for uptake of hydrophobic pollutants. The mean lipid content of the minnows was 6.5 % of the wet weight in the carcasses, and 26.5 % of the digestive tract. The concentrations of polychlorinated biphenyls (PCBs) in the fish carcasses and guts were directly proportional to the lipid contents of these body portions. Microscopic examination of periphyton in the guts, and the analysis of fatty acid markers showed that green algae dominated periphyton ingested by the minnows in East Fork Poplar Creek (∼90 % of the ingested algal biomass was from chlorophytes). The fatty acid profiles of the minnow guts (including their gut contents), and their lipid stores in East Fork Poplar Creek also reflected extensive ingestion of green algae indicated by an abundance of a fatty acid marker α-linolenic acid (18:3ω3), at 13 % of the total fatty acids. A relatively low biomass of diatoms, and a correspondingly low concentration of a fatty acid characteristic of diatoms (eicosapentaenoic acid, 20: 5ω3) occurred in periphyton from both Hinds Creek and White Oak Creek. Nevertheless, taxonomic and lipid analyses of the minnow gut contents showed that in White Oak Creek diatoms constituted a disproportionately large share of the minnows' diet. The discrepancy in fatty acid profiles between the portion of periphyton in this stream and the gut contents of C. anomalum suggests that the minnows do not consume all portions of the periphyton equally. These results emphasize the applicability of fatty acid analysis to reveal trophic linkages in aquatic ecosystems.