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首页> 外文期刊>Environmental toxicology and chemistry >A COMPARISON OF THE SENSITIVITY OF STREAM BENTHIC COMMUNITY INDICES TO EFFECTS ASSOCIATED WITH MINES, PULP AND PAPER MILLS, AND URBANIZATION
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A COMPARISON OF THE SENSITIVITY OF STREAM BENTHIC COMMUNITY INDICES TO EFFECTS ASSOCIATED WITH MINES, PULP AND PAPER MILLS, AND URBANIZATION

机译：矿床，纸浆和纸浆以及城市化相关的底栖底栖生物指数对敏感性的比较

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This study examined the relative sensitivities of seven commonly used indices of stream benthic community composition and three multivariate indices to effects associated with mines, pulp and paper mills, and urbanization. The indices included total abundance, number of taxa, diversity (H′), evenness, Hilsenhoff's biotic index (HBI), the BioMAP water quality index (WQI), the percent model affinity (PMA), and the first three ordination axes from a correspondence analysis. The second objective of the study was to determine the degree of redundancy among these indices. Six data sets (two from each of the three types of development) were used to address the objectives. In each data set, replicate benthic samples were collected from reference areas as well as one or more downstream areas exposed to a point-source or non-point-source discharge. The PMA approach and the ordination axes indicated significant differences between the reference and downstream communities for all six data sets (p < 0.05). With the exception of H′, each of the other metrics revealed significant effects associated with one or two, but not all three, types of development. For example, the HBI and WQI indicated significant effects associated with pulp and paper mills and urbanization, but not mining. In all studies, effect sizes (i.e., the standardized difference between means for the reference and exposed areas expressed in units of standard deviations [SDs]) exceeded 2 SDs. However, effect sizes for the PMA and the first or second ordination axis scores were generally larger than effect sizes for the other metrics, indicating that these indices were often the most sensitive indicators of development. In addition, a high degree of redundancy was found among the various metrics, perhaps because the effects were large (i.e., >2 SDs). The greater sensitivity of the ordination axes and the PMA approach emphasizes their value as indices of benthic community composition. As a result, we recommend that any suite of indices used for assessing benthic communities should include these types of multivariate metrics.
机译：这项研究检查了七个常用的河流底栖生物群落组成指数和三个多元指数对与矿山，纸浆和造纸厂以及城市化有关的影响的相对敏感性。指数包括总丰度，分类单元数量，多样性（H'），均匀度，希尔森霍夫生物指数（HBI），BioMAP水质指数（WQI），模型亲和力百分比（PMA）和来自植物的前三个协调轴对应分析。研究的第二个目的是确定这些指标之间的冗余度。六个数据集（三种开发类型中的两种数据集）用于实现目标。在每个数据集中，均从参考区域以及暴露于点源或非点源排放的一个或多个下游区域收集重复的底栖生物样本。 PMA方法和协调轴表明，对于所有六个数据集，参考社区和下游社区之间都存在显着差异（p <0.05）。除了H'，其他每个指标都显示出与一种或两种（但不是全部三种）发育类型相关的显着影响。例如，HBI和WQI指出与制浆造纸厂和城市化有关的重大影响，但与采矿无关。在所有研究中，效果大小（即，参考标准和暴露区域的均值之间的标准差以标准差[SDs]表示）超过2个SD。但是，PMA和第一个或第二个协调轴分数的效果大小通常大于其他指标的效果大小，表明这些指标通常是最敏感的发展指标。另外，在各种指标中发现了高度的冗余，这可能是因为影响很大（即，> 2 SD）。协调轴和PMA方法的敏感性更高，强调了它们作为底栖动物群落组成指标的价值。因此，我们建议用于评估底栖动物群落的任何一套指标都应包括这些类型的多元指标。

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