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首页> 外文期刊>Environmental toxicology and chemistry >Influence of water quality and associated contaminants on survival and growth of the endangered Cape Fear shiner (Notropis mekistocholas).
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Influence of water quality and associated contaminants on survival and growth of the endangered Cape Fear shiner (Notropis mekistocholas).

机译：水质和相关污染物对濒临灭绝的开普弗雷尔（Notropis mekistocholas）存活和生长的影响。

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The Cape Fear shiner (Notropis mekistocholas) is a recently described cyprinid species endemic to the Cape Fear River Basin of North Carolina, USA. Only five populations of the fish remain; thus, it is listed as endangered by the U.S. Government. Determining habitat requirements of the Cape Fear shiner, including water quality and physical habitat, is critical to the survival and future restoration of the species. To assess water quality in the best remaining and in the historical habitats, we conducted a 28-d in situ bioassay with captively propagated Cape Fear shiners. Fish were deployed at 10 sites in three rivers, with three cages per site and 20 fish per cage. Water and sediment samples were collected and analyzed for selected metals and organic contaminants. Passive sampling devices also were deployed at each site and analyzed for organic contaminants at test termination. Fish survival, growth (as measured by an increase in total length), and contaminant accumulation were measured on completion of the bioassay. Survival of caged fish averaged 76% (range, 53-100%) and varied significantly among sites and rivers. Caged fish accumulated quantities of cadmium, mercury, polychlorinated biphenyls, and other persistent contaminants over the test duration and grew significantly at only four sites. No apparent relations were observed between exposure to or accumulation of a specific contaminant and reduced growth or survival of fish among all the sites. However, a generalized hazard assessment showed that certain sites exhibited trends in cumulative contaminant presence with reduced fish survival and growth, thereby enabling the identification of the existing riverine habitat most suitable for reintroduction or population augmentation of this endangered fish.
机译：Cape Fear发光器（Notropis mekistocholas）是最近描述的美国北卡罗来纳州Cape Fear河盆地特有的鲤科鱼类。鱼只剩下五个种群。因此，它被美国政府列为濒危物种。确定Cape Fear发光体的栖息地要求，包括水质和自然栖息地，对于该物种的生存和未来恢复至关重要。为了评估残留最好的和历史栖息地的水质，我们对28 d原位生物分析进行了繁育的开普菲尔角（Cape Fear）发光剂。在三个河流的10个地点部署了鱼，每个地点三个网箱，每个网箱20条鱼。收集水和沉积物样品并分析选定的金属和有机污染物。无源采样设备也部署在每个站点，并在测试终止时分析有机污染物。在完成生物测定后，测量鱼的存活率，生长（通过增加总长度来衡量）和污染物积累。笼养鱼的平均存活率为76％（范围53-100％），在不同地点和河流之间差异很大。笼养鱼在测试过程中积累了镉，汞，多氯联苯和其他持久性污染物，并且仅在四个位置显着增长。在所有地点中，特定污染物的接触或积累与鱼类的生长或存活率降低之间没有发现明显的关系。但是，一项广义的危害评估表明，某些地点的污染物累积存在趋势，鱼类的生存和生长减少，从而能够确定最适合该濒危鱼类的再引入或种群增加的现有河沿生境。

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