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首页> 外文期刊>Journal of Environmental Science and Health >The relationship of benthic community metrics to pyrethroids, metals, and sediment characteristics in Cache Slough, California
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The relationship of benthic community metrics to pyrethroids, metals, and sediment characteristics in Cache Slough, California

机译：加利福尼亚州Cache Slough底栖生物群落指标与拟除虫菊酯，金属和沉积物特征的关系

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A bioassessment multiple stressor study was conducted at 12 sites in Cache Slough, California during the Spring and Fall of 2012, 2013 and 2014. Specific study goals were to: (1) collect and identify benthic macroinvertebrates and develop a suite of benthic metrics; (2) measure total organic carbon (TOC), grain size, bulk metals, simultaneously extracted metals (SEM) and acid volatile sulfides (AVS), and 8 pyrethroids in sediment; (3) measure basic water quality parameters; and, (4) use univariate and stepwise multiple regressions and canonical correlation analysis to determine the relationship between various benthic metrics (i.e., taxa richness, abundance) and TOC, grain size, metals (bulk metals and SEM/AVS) and pyrethroids using the 3-year database. Five benthic metrics showed statistically significant relationships with environmental variables. Taxonomic Richness, a metric that decreases with stress, tended to be greater in less organic-rich, coarser sediments and the apparent relationships with toxicants such as pyrethroids or metals were diminished when these conditions are taken into account. The % Amphipod metric, which has a variable response to environmental stressors, showed a direct relationship with arsenic, an inverse relationship with chromium and an inverse relationship with % silt. The % Corbicula metric, which has a variable response to environmental stressors, was directly correlated with cypermethrin and nickel. Therefore, it appears that Corbicula tends to be associated with more contaminated sediments in Cache Slough. The metric % Collectors/Filterers & Collectors/Gatherers, a metric that increases in stressed environments, was reported to increase in sediments with higher arsenic concentrations. This relationship makes ecological sense because this metric should increase with an increase in arsenic concentrations. The benthic metric Abundance, a metric that decreases with stress, was reported to be inversely correlated with % TOC and % silt. The abundance of benthic communities increases in coarser, less organic rich sediments. In general, relatively few statistically significant relationships were observed between the various combinations of benthic metrics and environmental variables. Benthic communities in Cache Slough appear to be more closely associated with sediment characteristics and with metals concentrations than with the pyrethroid concentrations.
机译：在2012年春季和秋季，2013年和2014年春季和秋季，在加利福尼亚州的Cache Slough的12个地点进行了生物评估多应激源研究。具体研究目标是：（1）收集和识别底栖大型无脊椎动物，并开发一套底栖指标； （2）测量沉积物中的总有机碳（TOC），粒度，大块金属，同时提取的金属（SEM）和酸挥发性硫化物（AVS），以及8种拟除虫菊酯； （3）测量基本水质参数； （4）使用单变量和逐步多元回归以及典范相关分析来确定各种底栖指标（即，分类单元丰富度，丰度）与TOC，粒度，金属（大块金属和SEM / AVS）和拟除虫菊酯之间的关系。 3年数据库。五个底栖指标显示出与环境变量的统计显着关系。分类学丰富度是一种随压力而降低的度量标准，在有机物含量较低，较粗的沉积物中趋向于更大，考虑到这些条件，与拟除虫菊酯或金属之类的有毒物质之间的表观关系就会减弱。对环境胁迫因素具有可变响应的％ampipod度量标准显示出与砷的直接关系，与铬的反向关系以及与粉沙％的反向关系。对环境胁迫因素具有可变响应的Corbicula百分比指标与氯氰菊酯和镍直接相关。因此，Corbicula似乎倾向于与Cache Slough中受更多污染的沉积物有关。据报道，在受胁迫的环境中增加的度量标准“收集器/过滤器和收集器/收集器百分比”随着砷浓度的升高而增加。这种关系具有生态意义，因为该指标应随砷浓度的增加而增加。底栖度量标准丰度是随压力降低的度量标准，据报告与％TOC和％淤泥成反比。底栖生物群落的丰度在较粗的，有机物较少的沉积物中增加。通常，在底栖指标和环境变量的各种组合之间观察到相对较少的统计显着性关系。 Cache Slough中的底栖生物群落似乎与拟除虫菊酯浓度密切相关，与沉积物特征和金属浓度有关。

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