Longitudinal Variations in Macroinvertebrate and Periphyton Communities in a Mountain Stream Receiving Mine Drainage: Are Their Changes in Response to Metal Contamination Different?

Hiroyuki Kagawa, Y. Iwasaki, Hiroshi Kimura, Hironobu Inukai, Keiichi Sasaki, Rui Yasuda, T. Yasutaka, Saburo Yamagata, Yuji Kawamura
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Abstract

We investigated longitudinal variations in metal concentrations and in benthic macroinvertebrate and periphyton communities at 13 sites in the tributaries of the upstream Hida River to assess the ecological impacts of mine drainage. At the sites immediately downstream of the inflow of mine drainage, the concentrations of trace metals such as zinc increased ( e.g., the maximum zinc concentration of 0.94 mg L -1 was observed ) , large reductions in the taxon richness and abundance of macroinvertebrates and in the taxon richness of periphyton were observed, and tolerant taxa ( e.g., chironomids and baetid mayflies, and Achnanthidium diatoms ) , which are known to be present in metal-contaminated rivers, dominated their respective communities. Metal concentrations decreased at the downstream sites, and the macroinvertebrate community composition observed at the most downstream site was similar to those at reference sites. Although the longitudinal variations in the taxon richness and community composition of macroinvertebrates and periphyton were similar in the studied river, we observed some differences such as the markedly increased abundance of periphyton at the sites downstream of the inflow of mine discharge. Thus, the investigaton of multiple biological groups is required for a comprehensive understanding of the ecological impacts of mine drainage on aquatic communities.
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高山溪流中大型无脊椎动物和周边植物群落的纵向变化:它们对金属污染的响应是否不同?
本文研究了飞田河上游支流13个地点金属浓度的纵向变化,以及大型底栖无脊椎动物和周边植物群落的纵向变化,以评估矿山排水的生态影响。的网站立即下游流入我的排水、锌等微量金属浓度增加(例如,最大锌浓度0.94毫克L 1观察),大减少分类单元丰富性和丰富的大型无脊椎动物和固着生物分类单元丰富的观察,和宽容类群(如chironomids baetid蜉蝣,Achnanthidium硅藻),这是已知的在metal-contaminated河流,统治他们各自的社区。金属浓度在下游站点呈下降趋势,大部分下游站点的大型无脊椎动物群落组成与参考站点相似。研究河流中大型无脊椎动物和周边植物的分类丰富度和群落组成的纵向变化相似,但也存在一些差异,例如在矿井排放物流入下游的站点,周围植物的丰度明显增加。因此,为了全面了解矿井排水对水生生物群落的生态影响,需要对多个生物类群进行调查。
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