Riverine macroinvertebrate responses to chlorine and chlorinated sewage effluents - acute chlorine tolerances of &lt;i&gt;Baetis harrisoni&lt;/i&gt; (Ephemeroptera) from two rivers in KwaZulu-Natal, South Africa

Williams, M. L.; Palmer, CG; Gordon, AK

doi:10.4314/wsa.v29i4.5056

Cited by 4 publications

(7 citation statements)

References 14 publications

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“…As mentioned above, the sensitivities of BFI measurement to SC BF and SC RO were calculated and the uncertainties of CMB results obtained using different parameter determination methods and monitoring durations were evaluated to identify the most accurate parameter calculation method and the shortest appropriate monitoring period. The dimensionless sensitivity index of BFI (output) with SC BF (uncertain input) and SC RO , S(BFI|SC BF ) and S(BFI|SC RO ), reflecting the proportional relationship between the relative error in BFI and the relative error in parameters, were calculated using the following equations (Yang et al, 2019):…”

Section: Quantitative Estimates Of the Sensitivity And Uncertainty Inmentioning

confidence: 99%

“…The average uncertainty in multiple calculation processes is then used to estimate the uncertainty in the baseflow index (BFI, long-term ratio of baseflow to total streamflow), which can be expressed as W BFI-Genereux (Genereux and Hooper, 1998;Miller et al, 2014). On the other hand, Yang et al (2019) found that random measurement errors in y k or SC k for time series exceeding 365 d will cancel each other out, allowing the influence on BFI to be ignored. An additional uncertainty estimation method of BFI can then be derived on the basis of the sensitivity analysis (Yang et al, 2019):…”

Section: Quantitative Estimates Of the Sensitivity And Uncertainty Inmentioning

confidence: 99%

“…On the other hand, Yang et al (2019) found that random measurement errors in y k or SC k for time series exceeding 365 d will cancel each other out, allowing the influence on BFI to be ignored. An additional uncertainty estimation method of BFI can then be derived on the basis of the sensitivity analysis (Yang et al, 2019):…”

Section: Quantitative Estimates Of the Sensitivity And Uncertainty Inmentioning

confidence: 99%

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Key challenges facing the application of the conductivity mass balance method: a case study of the Mississippi River basin

Lyu

Xia

Zhang

2020

Hydrol. Earth Syst. Sci.

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Abstract. The conductivity mass balance (CMB) method has a long history of application to baseflow separation studies. The CMB method uses site-specific and widely available discharge and specific conductance data. However, certain aspects of the method remain unstandardized, including the determination of the applicability of this method for a specific area, minimum data requirements for baseflow separation and the most accurate parameter calculation method. This study collected and analyzed stream discharge and water conductivity data for over 200 stream sites at large spatial (2.77 to 2 915 834 km2 watersheds) and temporal (up to 56 years) scales in the Mississippi River basin. The suitability criteria and key factors influencing the applicability of the CMB method were identified based on an analysis of the spatial distribution of the inverse correlation coefficient between stream discharge and conductivity and the rationality of baseflow separation results. Sensitivity analysis, uncertainty assessment and T test were used to identify the parameter the method was most sensitive to, and the uncertainties of baseflow separation results obtained from different parameter determination methods and various sampling durations were compared. The results indicated that the inverse correlation coefficient between discharge and conductivity can be used to quantitatively determine the applicability of the CMB method, while the CMB method is more applicable in tributaries, headwater reaches, high altitudes and regions with little influence from anthropogenic activities. A minimum of 6-month discharge and conductivity data was found to provide reliable parameters for the CMB method with acceptable errors, and it is recommended that the parameters SCRO and SCBF be determined by the 1st percentile and dynamic 99th percentile methods, respectively. The results of this study can provide an important basis for the standardized treatment of key problems in the application of the CMB.

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Section: Quantitative Estimates Of the Sensitivity And Uncertainty Inmentioning

confidence: 99%

Section: Quantitative Estimates Of the Sensitivity And Uncertainty Inmentioning

confidence: 99%

Section: Quantitative Estimates Of the Sensitivity And Uncertainty Inmentioning

confidence: 99%

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Key challenges facing the application of the conductivity mass balance method: a case study of the Mississippi River basin

Lyu

Xia

Zhang

2020

Hydrol. Earth Syst. Sci.

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“…Wan et al (2000) found that 50% mortality (LC50) in the population of Daphnia magna was caused by 0.017 mg/L exposure to inorganic chloramines over 48 hours. Another study by Williams et al (2003) showed that benthic macro invertebrate community structure (abundance and number of taxa) substantially decreased (sometimes to zero) in river sites exposed to chlorinated sewage.…”

Section: Free Chlorine (Cl2)mentioning

confidence: 99%

Palm oil industry effect on water quality status of Pawan and Jelai Rivers in Ketapang Regency in 2012-2016

Hidayat¹,

Mulyono²

2019

J.Degrade.Min.Land Manage.

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Pawan and Jelai Rivers are two of the three main rivers in Ketapang Regency, West Kalimantan. The extensive growth of palm oil industry in Ketapang might affect the aquatic environment, especially the rivers, due to excessive uses of water. Therefore, the aims of this study were to examine the effect of palm oil industry on the changes in water quality status of Pawan and Jelai Rivers in Ketapang regency during 2012-2016 and to identify critical parameters that might determine the water quality status in the two rivers. This study used the laboratory testing results of Pawan and Jelai Rivers, which were carried out periodically by various companies/institutions. There were 24 physical, chemical, and microbiological parameters that were analyzed to determine the water quality status using STORET method. Critical parameters were determined by comparing parameters analyzed with their threshold values. The results revealed that Pawan and Jelai Rivers passing through oil palm plantations and palm oil mills were moderately to highly polluted in 2012, 2014 and 2016. Critical parameters of the river water quality are BOD, COD, Cl2, phenol, Fe, and total Coliform.

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“…Zokufa et al (2001) showed that groundwater from these pastures still reaches the river via springs and is the main contributing factor to the salinisation problem. The effect of salts on the river's aquatic biota, and in particular macroinvertebrates, has been the topic of a number of laboratory and field-based toxicity studies (Palmer et al 1996, Zokufa et al 2001, Williams et al 2003, Kefford et al 2004. Nevertheless, the extent to which salinisation influences macroinvertebrate community structure in the Elands is still largely unknown.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal variation in the macroinvertebrate community structure of the lower Elands River, Mpumalanga, South Africa

Ferreira¹,

Wepener²,

Vuren³

2009

African Journal of Aquatic Science

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The Elands River, Mpumalanga, is an ecologically sensitive river that is constantly threatened by a variety of human activities. The influence of a pulp and paper mill on the river's macroinvertebrate assemblages was studied in March and June 2005, representing high-and low-flow seasons, respectively. Macroinvertebrates were collected from various biotopes using a standard sampling net, and were preserved and identified to family level. A range of multivariate and univariate statistical analyses was applied to assess the spatial and temporal variations in the macroinvertebrate communities. Diversity loss and dominance by a single taxon, Melanoides tuberculata, were noted directly below the mill. Other sites did not appear to be affected. Macroinvertebrate communities at all sites showed a strong seasonal variation.

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Riverine macroinvertebrate responses to chlorine and chlorinated sewage effluents - acute chlorine tolerances of <i>Baetis harrisoni</i> (Ephemeroptera) from two rivers in KwaZulu-Natal, South Africa

Cited by 4 publications

References 14 publications

Key challenges facing the application of the conductivity mass balance method: a case study of the Mississippi River basin

Key challenges facing the application of the conductivity mass balance method: a case study of the Mississippi River basin

Palm oil industry effect on water quality status of Pawan and Jelai Rivers in Ketapang Regency in 2012-2016

Spatial and temporal variation in the macroinvertebrate community structure of the lower Elands River, Mpumalanga, South Africa

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