Impacts of rapid urbanization on the water quality and macroinvertebrate communities of streams: A case study in Liangjiang New Area, China

Luo, Kun; Hu, Xuebin; He, Qiang; Wu, Zhengsong; Cheng, Hao; Hu, Zhenlong; Mazumder, Asit

doi:10.1016/j.scitotenv.2017.10.068

Cited by 117 publications

(62 citation statements)

References 63 publications

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“…The pollution load increment in the rainy season was regarded as the NPS input. Many researchers employ the rainy season and dry season when exploring the spatiotemporal changes in water quality according to precipitation (Luo et al, 2018;Han et al, 2020). Therefore, June, July and August were regarded as the rainy season in this study.…”

Section: Lasso Regressionmentioning

confidence: 99%

Spatiotemporal variability and key influencing factors of river fecal coliform within a typical complex watershed

et al. 2020

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a b s t r a c tFecal coliform bacteria are a key indicator of human health risks; however, the spatiotemporal variability and key influencing factors of river fecal coliform have yet to be explored in a rural-suburban-urban watershed with multiple land uses. In this study, the fecal coliform concentrations in 21 river sections were monitored for 20 months, and 441 samples were analyzed. Multivariable regressions were used to evaluate the spatiotemporal dynamics of fecal coliform. The results showed that spatial differences were mainly dominated by urbanization level, and environmental factors could explain the temporal dynamics of fecal coliform in different urban patterns except in areas with high urbanization levels. Reducing suspended solids is a direct way to manage fecal coliform in the Beiyun River when the natural factors are difficulty to change, such as temperature and solar radiation. The export of fecal coliform from urban areas showed a quick and sensitive response to rainfall events and increased dozens of times in the short term. Landscape patterns, such as the fragmentation of impervious surfaces and the overall landscape, were identified as key factors influencing urban non-point source bacteria. The results obtained from this study will provide insight into the management of river fecal pollution.

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Section: Lasso Regressionmentioning

confidence: 99%

Spatiotemporal variability and key influencing factors of river fecal coliform within a typical complex watershed

et al. 2020

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“…We then preserved the sample by adding 75% ethanol. Macroinvertebrates were identified in the laboratory at the family level using a stereo dissecting microscope [59][60][61]. The characteristics of the macroinvertebrate community at each site were described using the following metrics-abundance (N), dominance index (Y, Y > 0.02), diversity metrics: Pielou evenness index (J) [62], Shannon-Wiener diversity index (H) [63], and Margalef richness index (D) [64].…”

Section: Macroinvertebrate Samplingmentioning

confidence: 99%

“…However, different nitrogen nutrients had different effects on the diverse family, and may even have negative effects (Figure 3c). Thus, nutrient concentrations may also degrade the structure and function of the macroinvertebrate community and reduce biological diversity [59,75].…”

Section: Effect Of Upwelling Dynamics On Macroinvertebrate Communitiesmentioning

confidence: 99%

Effect of Hyporheic Exchange on Macroinvertebrate Community in the Weihe River Basin, China

Lin

Song

Gualtieri

et al. 2020

Water

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The effect of hyporheic exchange on macroinvertebrates is a significant topic in ecohydraulics. A field study was conducted during May and June 2017 to investigate the impacts of magnitude and patterns of hyporheic exchange on the sediment macroinvertebrate community in the Weihe River basin. The results demonstrate that upwelling flows cause resuspension of riverbed sediment, increasing the proportion of swimmer groups (such as Baetidae) in the macroinvertebrate community. However, large resuspension of river bed sediment results in a reduced abundance of macroinvertebrates. By controlling the transport processes of dissolved oxygen (DO), dissolved organic carbon (DOC), nutrients, temperature, and different patterns of hyporheic exchange strongly influence the structure of macroinvertebrate communities. Downwelling is more likely to produce rich invertebrate communities than upwelling. The magnitude for the hyporheic flux of 150-200 mm/d was optimal for the macroinvertebrate community in the Weihe River Basin. Above or below this rate results in a decline in community abundance and diversity. We suggest that research is conducted to better understand the effects of hyporheic exchange across bedforms on macroinvertebrate communities. The study supports any activities to preserve the ecological functions and health of rivers dominated by fine-grained sediments.

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“…Similarly, the concentration of phosphate was much higher than the critical value .According to (Awoke et al, 2016) maximum allowable concentration of phosphate in irrigation water is 2 mgLˉ¹ in all most all site except upstream and S11and this may be due finoteselam town that domestic waste discharges, and phosphates detergent to the sites through point and non point source in addition to fertilizers run from the catchment. It has been reported that rapid urbanization, waste discharge, and other anthropogenic activities are known causes of nutrient enrichment and threat river deterioration (Luo et al, 2017). .…”

Section: Discussionmentioning

confidence: 99%

“…The result of the current study were quite concurrent with a few earlier studies (Berger et al, 2018;Arimoro & Muller, 2010), which reported that diversity or richness of tolerant species increased and sensitive species dominance decreased considerably a result of anthropogenic threats such as waste discharge ,unplanned urbanization, sand and stone derange and other interrelated activity. Land-use patterns and degree of urbanizations influence species composition of river (Luo et al, 2017). Many taxa including Gompidae,Aeshnidae ,Coenagrionidae, perlidae, Gyrinidae, Caenidae,Notoectidae, Heptagenidae, Hydrophilidae, Hydropsychidae, Libellulidae, Naucoridae,Elmidae, Athericidae, Chloroperlidae, Calopterygidae, Ceratopogonidae, Corixidae and Psychomyiidae were collected exclusively at midstream sites where as low in numbers at downstream sites.…”

Section: Discussionmentioning

confidence: 99%

Influence Of Urbanization On Ecological Status Of River In Amhara Region, Ethiopia 2019

2019

Preprint

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IntroductionUrbanization is one of the main causes for environmental problems due to the introduction of pollutants into water bodies. Lahi is crossing fintoselam. This river has long been used for a variety of purposes including source of public water supply, small scale irrigation, bathing, washing, animal watering, sand and stone dredging and recreation.Objective: To assess the influence of Finoteselam town on ecological status of Lahi river Methods: The assessment were assessed using physicochemical parameters, physical habitat assessment, biotic indices /metrics , human activity by observation as well as macroinvertabretes samples from eleven sampling sites coded S1to S11 along the river using the standard procedures. The assessments were involved in-situ measurements and collection of water samples in April 2019 then, analyzed the water samples in laboratory. Results:The biological analysis reveals a notable reduction of the diversity macroinvertabrates in the downstream direction where the minimum was at midstream sites .Upstream has significantly better macroinvertabrates assemblage than midstream(p-value<0.05).Physical habitat evaluation scores varied from 43 at S8 to173 at S1 and relatively lower score were recorded at midstream sites. Low % of Ephemeroptera, Plecoptera and Trichoptera with high family biotic index and high % of Diptera with low biological monitoring working party also indicated water ecology deteriorated mainly at midstream sites. Multivariate analysis of classical analysis, canonical correspondence analysis and none metric multidimensional scaling also indicated ecological deterioration at midstream sites mainly at S5 , S6,S7 and S8. Conclusion:Midstream was relatively more polluted than upstream due to influence of pollutant from Finoteselam town. The ecological status of upstream segments of the river is very good with slight organic pollutions, and at midstream is poor and significant degree of organic pollutions; whereas the status of the downstream is fair with fairly substantial water pollution showing moderate ecological disturbance. In general, midstream the sampling stations show the deterioration in water ecology and thus necessitated a need for mitigation measure to save the Lahi.

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Impacts of rapid urbanization on the water quality and macroinvertebrate communities of streams: A case study in Liangjiang New Area, China

Cited by 117 publications

References 63 publications

Spatiotemporal variability and key influencing factors of river fecal coliform within a typical complex watershed

Spatiotemporal variability and key influencing factors of river fecal coliform within a typical complex watershed

Effect of Hyporheic Exchange on Macroinvertebrate Community in the Weihe River Basin, China

Influence Of Urbanization On Ecological Status Of River In Amhara Region, Ethiopia 2019

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