Biomonitoring for deposited sediment using benthic invertebrates: a test on 4 Missouri streams
Biomonitoring for deposited sediment using benthic invertebrates: a test on 4 Missouri streams
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利用底栖无脊椎动物对沉积物进行生物监测：对密苏里州 4 条溪流进行的测试
DOI：
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发表时间：
2001
影响因子：
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通讯作者：
C. Rabení
中科院分区：
文献类型：
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作者：
Leanna D. Zweig;C. Rabení
研究了密苏里州4条河流中底栖无脊椎动物对地表沉积物的响应。根据基质粒度分布、深度和流速的相似性，但沉积物数量的差异（从0到100%的表面覆盖范围），在每条河流中选择了20到24个采样点。沉积沉积物的量化有两种方式：一种是对地表覆盖的目测，另一种是对基质嵌入度的测量，这两种方法相互之间以及与沙的数量高度相关。在指定的时间内，在1平方米的区域内使用踢球网收集无脊椎动物。5个常用的生物监测指标（类群丰富度、密度、Ephemeroptera、Plecoptera和Trichoptera [EPT]丰富度、EPT密度和EPT/Chironomidae丰富度）在河流与沉积物之间呈显著相关。Shannon多样性指数、手摇蝇科丰富度、手摇蝇科密度、生物指数和优势分类群百分比与沉积水平的增加无关。建立了30个分类群对沉积沉积物响应的容差值。沉积-沉积物容限值与生物指数容限值不相关，表明类群对沉积-沉积物的响应不同于对有机富集的响应。沉积容许值被用来建立沉积生物指数（DSBI）。计算了所有样本（n = 85）的DSBI，以表征采样溪流的泥沙损伤。每个地点的DSBI值与沉积沉积物的测量高度相关。通过重新采样程序进行的模型验证证实，DSBI是评估沉积沉积物生态效应的潜在有用工具。
The response of stream benthic invertebrates to surficially deposited fine sediment was investigated in 4 Missouri streams. Twenty to 24 sampling sites in each stream were selected based on similarities of substrate particle-size distributions, depths, and current velocities but for differences in amounts of deposited sediment, which ranged from 0 to 100% surface cover. Deposited sediment was quantified 2 ways: a visual estimate of % surface cover, and a measurement of substrate embeddedness, which were highly correlated with each other and with the amount of sand. Invertebrates were collected using a kicknet for a specified time in a 1-m2 area. Five commonly used biomonitoring metrics (taxa richness, density, Ephemeroptera, Plecoptera, and Trichoptera [EPT] richness, EPT density, and EPT/Chironomidae richness) were consistently significantly correlated across streams to deposited sediment. Shannon diversity index, Chironomidae richness, Chironomidae density, a biotic index, and % dominant taxon did not relate to increasing levels of deposited sediment. Tolerance values representing taxa responses to deposited sediment were developed for 30 taxa. Deposited-sediment tolerance values were not correlated with biotic index tolerance values, indicating a different response by taxa to deposited sediment than to organic enrichment. Deposited-sediment tolerance values were used to develop the Deposited Sediment Biotic Index (DSBI). The DSBI was calculated for all samples (n = 85) to characterize sediment impairment of the sampled streams. DSBI values for each site were highly correlated with measures of deposited sediment. Model validation by a resampling procedure confirmed that the DSBI is a potentially useful tool for assessing ecological effects of deposited sediment.