Impacts of small bypass plants on water chemical characteristics and macroinvertebrate communities in the Lancang River basin of southwest China

Guo, Weijie; Zhao, Liangyuan; Zhao, Wenlong; Tang, Xianqiang; Li, Qingyun; Huang, Zhuo Min

doi:10.5004/dwt.2018.22668

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“…Most Chinese hydropower stations are located in the mountainous rivers of southern China because of the abundant water resources in these rivers. Previous studies have shown that changes in river morphology (e.g., riffles and rapid flow) and hydraulic conditions (e.g., velocity and water depth) influence the benthic community structure [2][3][4]. In addition, the effect of external disturbances in small-scale water ecosystems is particularly evident, and the degradation rate of small watershed systems is faster, but the recovery time is relatively short [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…In summary, most related studies have concentrated on the effect of hydropower stations on hydrological changes and macroinvertebrate community structures. Few studies have focused on the influence of different types of small hydropower stations [3,4]. Many small hydropower stations have been established in China, yet it is unclear whether they have had a significant influence on the macroinvertebrate community structure and whether the influence differs between different types of hydropower station (diversion-type and dam-type).…”

Section: Introductionmentioning

confidence: 99%

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Influence of Different Types of Small Hydropower Stations on Macroinvertebrate Communities in the Changjiang River Basin, China

Zhao

Guo

Zhao

et al. 2019

Water

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Many studies have investigated the influence of hydropower stations on macroinvertebrate communities, but few have clarified the influence of different types of hydropower stations. A total of 133 samples obtained from seven rivers, on which 45 hydropower stations are located, with the rivers distributed across four provinces (Yunnan, Jiangxi, Fujian, and Hubei) were investigated to study the influence of different types of small hydropower stations on macroinvertebrate communities. Samples were collected during 2011–2012. Results showed that 126 taxa of macroinvertebrates were collected, of which 68.3% were insects. The average macroinvertebrate density and biomass were 966 ± 112 ind/m2 and 17.31 ± 1.54 g/m2, respectively. For dam-type hydropower stations, the intercepting effect of the dam was the main factor affecting macroinvertebrate populations, whereas the influence of hydrological period was nonsignificant. Macroinvertebrate taxa richness exhibited a gradual increase from reservoir reaches to down-dam reaches and then to natural reaches (4.4, 6.5, and 9.5, respectively). The Shannon–Wiener index showed a similar increasing trend (1.06, 1.48, and 1.58, respectively), whereas biomass levels exhibited a decreasing trend (56.3, 25.2, and 6.0 g/m2, respectively). For the diversion-type hydropower stations, hydrological period was the main influential factor, whereas the intercepting effect of the dam was nonsignificant. From wet to dry seasons, increases were observed in macroinvertebrate abundance (5.2 to 8.3), density (322.2 to 1170.5 ind/m2), biomass (24.6 to 40.1 g/m2), and Shannon–Wiener index (1.23 to 2.08).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%