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首页> 外文期刊>Journal of Freshwater Ecology >Factors influencing the accuracy of a macroinvertebrate bioassessment protocol in South Carolina Coastal Plain streams.
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Factors influencing the accuracy of a macroinvertebrate bioassessment protocol in South Carolina Coastal Plain streams.

机译：影响南卡罗来纳州沿海平原溪流中大型无脊椎动物生物评估方案准确性的因素。

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摘要

The multiple habitat sampling protocol (MHSP) is a bioassment method designed to assess the ecological health of South Carolina streams on the basis of macroinvertebrate samples collected from natural substrates. The MHSP is computed by averaging the EPT (numbers of Ephemeroptera, Plecoptera, Trichoptera taxa) and BI (a biotic index that reflects the pollution tolerances of individual taxa) to produce a bioclassification score. The MHSP produced low bioclassification scores that could falsely indicate environmental degradation in some undisturbed, high quality streams in the Sandhills ecoregion. This problem had two causes. The metrics (especially EPT) were significantly related to stream size, which potentially confounded stream size effects with environmental impacts, and the scoring criteria for EPT were too high for some Sandhills streams. We corrected these problems by developing new scoring criteria for Sandhills streams that utilized residuals from regressions of the metrics on stream width to normalize for stream size. The MHSP and related protocols are effective methods for assessing environmental quality, but allowances must be made for the effects of stream size and the potential ecological heterogeneity that naturally exists among streams in some ecoregions.
机译：多生境采样协议（MHSP）是一种生物评估方法，旨在根据从自然底物收集的大型无脊椎动物样本评估南卡罗来纳州河流的生态健康。 MHSP是通过对EPT（of翅目，鞘翅目，毛鳞翅目分类单元的数目）和BI（反映单个分类单元的污染耐受性的生物指数）取平均值以产生生物分类得分而计算得出的。 MHSP产生的生物分类得分较低，这可能错误地表明了Sandhills生态区一些未受干扰的高质量河流的环境退化。此问题有两个原因。度量标准（尤其是EPT）与河流大小显着相关，这可能将河流大小影响与环境影响混淆，并且对于某些Sandhills河流，EPT的评分标准过高。我们通过为Sandhills流开发新的评分标准来纠正这些问题，该标准使用了流宽度指标回归中的残差对流大小进行归一化。 MHSP和相关协议是评估环境质量的有效方法，但是必须考虑到河流大小和某些生态区域河流中自然存在的潜在生态异质性的影响。

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