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首页> 外文会议>Symposium "Invasive Asian Carps in North America >Use of Stable Isotopes and Mercury to Assess Trophic Positions of Black Carp and Other Large Fishes in the Red-Atchafalaya River System, Louisiana, USA
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Use of Stable Isotopes and Mercury to Assess Trophic Positions of Black Carp and Other Large Fishes in the Red-Atchafalaya River System, Louisiana, USA

机译：使用稳定的同位素和汞来评估红鲫鱼和其他大型鱼类的营养职位，在美国路易斯安那州路易斯安那州

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The black carp Mylopharyngodon piceus is a large (> 1 m long) riverine fish from eastern Asia introduced into the United States via the aquaculture industry. A wild population has been present in the lower Mississippi River basin since the early 1990s, but little is known about the ecological effect of black carp in invaded environments. In its native range, black carp feed almost exclusively on mollusks. In U.S. waters, they likely prey on native mussels, but few wild-caught specimens have been examined by biologists and all have had empty gastrointestinal tracts. In lieu of stomach content data, we examined isotopic values (delta~(13)C and delta~(15)N) and mercury (Hg) concentrations in muscle tissue of black carp and 10 other large nonnative andnative fish species captured in the Red-Atchafalaya River system of Louisiana, USA. Trophic position estimates derived from delta~(15)N values ranged from 2.0 for grass carp Ctenopharyngodon idella to 4.8 for blue catfish Ictalurus furcatus and flatheadcatfish Pylodictis olivaris. Adult black carp had a delta~(15)N value (l3.2%o), indicating a trophic level of 3.5. Mean total Hg concentrations ranged from 0.02 mu mu g/g in grass carp to 0.27 mu g/g in bigmouth buffalo Ictiobus cyprinellus, in black carp 0.17 mu g/g; Hg increased with increasing delta~(15)N, indicating biomagnification. The limited numbers of taxa and small samples sizes, as well as constraints in methods used, do not allow confirmation that wild black carp are consuming native mollusks. However, our stable isotope results do provide evidence that its diet is similar to other large fish species inhabiting the Red-Atchafalaya system considered to be benthic invertivores, including some known to prey on freshwater mollusks (i.e., smallmouth buffalo I. bubalus and nonnative common carp Cyprinus carpio).
机译：黑色鲤鱼Mylopharyncodon Piceus是来自东亚的大型（> 1米长）河流鱼鱼通过水产养殖业引入美国。自20世纪90年代初自20世纪90年代初以来，密西西比河流域野生群体已经存在，但对侵入环境中黑色鲤鱼的生态效应很少。在其本土范围内，黑色鲤鱼几乎完全喂于软体动物上。在美国水域中，他们可能捕食着原生贻贝，但是少数野生捕获的标本已经被生物学家检查，所有人都有空虚的胃肠道。代替胃含量数据，我们检查了同位素值（Delta〜（13）C和Delta〜（15）n）和汞（Hg）浓度在黑色鲤鱼的肌肉组织中，另外10个其他大型非舞蹈鱼类捕获的红色 - 美国路易斯安那州的哈拉亚州河流系统。促进来自δ〜（15）的营养位置估计率从2.0到草鲤Ctenopharyncodon idella到4.8的蓝鲶Intalurus furcatus和flatheadcatfish pylodictis olivaris。成年黑色鲤鱼有三角洲〜（15）个值（L3.2％O），表明营养水平为3.5。平均总Hg浓度在草鲤鱼中的0.02 mu mu g / g在大茅茅斯水牛伊替替替替菌菌属胞浆中的0.27μg/ g，黑色鲤鱼0.17μg/ g; HG随着δ〜（15）n的增加而增加，表明生物镀锌。有限数量的分类群和小型样品尺寸以及所用方法的限制，不允许确认野生黑鲤鱼正在消耗天然软体动物。然而，我们的稳定同位素结果确实提供了证据表明，其饮食类似于其他大型鱼类，这些大鱼物种被认为是被认为是底栖的倒闭，包括一些已知的淡水软体动物（即，小型水牛I.Bumalus和非常见鲤鱼cyprinus carpio）。

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