Benthic Insect Assemblage and Species-Level Responses to Eleven Years of Nutrient Addition in the Kootenai River, Idaho

IF 0.5 4区 环境科学与生态学 Q4 ECOLOGY Northwest Science Pub Date : 2021-10-12 DOI:10.3955/046.095.0105
Bahman Shafii, G. Minshall, Charles E. Holderman, P. Anders, W. Price
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引用次数: 1

Abstract

Abstract Because of their abundance and intermediate trophic level positions, benthic invertebrates can affect trophic dynamics in aquatic ecosystems by routing and regulating energy through aquatic food webs. Significant reductions in nutrient loading and primary production downstream from dams can profoundly affect benthic insect assemblages. The Kootenai River, a large 7th order river in Idaho, Montana, and British Columbia, experienced such changes following construction of Libby Dam in 1972. A nutrient addition program was initiated in 2005 to mitigate the resulting cultural oligotrophication. The goal of this study was to evaluate long-term responses to nutrient addition among benthic insects at the assemblage and species levels, using replicated data collected from 2003 to 2016, and classified into pre-, early post-, and late post-nutrient addition periods. Response metrics included total abundance and biomass measures across all species, as well as aggregated species of major insect orders, five functional feeding groups, and species richness. We also included abundance responses from a substantial number of individual Chironomidae, and non-Chironomidae insect species. Effects of nutrient addition were assessed using before-after-control-impact and before-and-after analyses. Spearman's Rank correlation coefficients were used to express the degree of association between biotic and abiotic factors. Nutrient addition consistently contributed to increased individual and total insect abundance each year for over a decade without inducing substantive changes in community composition or species dominance. Overall, benthic insects responded positively to nutrient addition and did so in a similar fashion in the early and late nutrient addition periods.
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爱达荷州库特奈河底栖昆虫群落和物种水平对11年营养添加的响应
摘要由于底栖无脊椎动物的丰富性和中等营养级位置,它们可以通过水生食物网传递和调节能量,从而影响水生生态系统的营养动态。大坝下游营养物质负荷和初级生产的大幅减少会对底栖昆虫群落产生深远影响。库特奈河是爱达荷州、蒙大拿州和不列颠哥伦比亚省的一条七级大河,在1972年利比大坝建成后经历了这样的变化。2005年启动了一项营养添加计划,以缓解由此产生的培养寡养现象。本研究的目的是利用2003年至2016年收集的复制数据,评估底栖昆虫在群落和物种水平上对营养添加的长期反应,并将其分为营养添加前、营养添加后早期和营养添加后晚期。响应指标包括所有物种的总丰度和生物量测量,以及主要昆虫目的聚集物种、五个功能性进食群和物种丰富度。我们还包括了大量摇蚊科个体和非摇蚊科昆虫物种的丰度反应。使用控制前后影响和前后分析来评估营养添加的效果。Spearman秩相关系数用于表示生物和非生物因素之间的关联程度。在十多年的时间里,营养素的添加每年都有助于昆虫个体和总丰度的增加,而不会引起群落组成或物种优势的实质性变化。总的来说,底栖昆虫对营养添加的反应是积极的,在营养添加的早期和晚期也有类似的反应。
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来源期刊
Northwest Science
Northwest Science 环境科学-生态学
CiteScore
1.30
自引率
0.00%
发文量
23
审稿时长
>36 weeks
期刊介绍: The pages of Northwest Science are open to original and fundamental research in the basic, applied, and social sciences. All submissions are refereed by at least two qualified peer reviewers. Papers are welcome from authors outside of the Pacific Northwest if the topic is suitable to our regional audience.
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