Impact assessment of local land use on ecological water quality of the Guayas river basin (Ecuador)

Damanik-Ambarita, Minar Naomi; Boets, Pieter; Nguyen, Thi Hanh Tien; Forio, Marie Anne Eurie; Everaert, Gert; Lock, Koen; Musonge, Peace Liz Sasha; Suhareva, Natalija; Bennetsen, Elina; Gobeyn, Sacha; Ho, Long; Domínguez-Granda, Luis; Goethals, Peter

doi:10.1016/j.ecoinf.2018.08.009

Cited by 20 publications

(16 citation statements)

References 58 publications

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“…2 ). In Ecuador, few studies assessed these chemical parameters in rivers 21 , 24 . Voloshenko-Rossin and colleagues evaluated some physicochemical parameters in the San Pedro, Guayllabamba and Esmeraldas Rivers 21 , obtaining similar values of pH, conductivity, dissolved oxygen (DO), and turbidity when compared to our study.…”

Section: Discussionmentioning

confidence: 99%

“…In 2020, a study evaluated the quality of eighteen rivers located in Quito 23 , identifying Machángara and Monjas Rivers as the most contaminated rivers based on the physicochemical and microbiological parameters. However, little is still known about the microbial and chemical contamination in Ecuador’s main rivers, despite some studies recently realized in rivers of certain major cities (Guayaquil, Esmeraldas, and Quito) of Ecuador 21 , 22 , 24 .…”

Section: Introductionmentioning

confidence: 99%

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Determining the microbial and chemical contamination in Ecuador’s main rivers

Vinueza

Ochoa‐Herrera

Maurice

et al. 2021

Sci Rep

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One major health issue is the microbial and chemical contamination of natural freshwater, particularly in Latin American countries, such as Ecuador, where it is still lacking wastewater treatment plants. This study analyzed the water quality in twelve rivers of Ecuador (Coastal, Andean, and Amazonian regions). All rivers showed levels of E. coli and total coliforms above the maximum limit according to International and Ecuadorian legislations. The most polluted rivers were Zamora, Esmeraldas and Machángara. Also, E. coli pathotypes were found in six rivers. Several physicochemical and metal parameters were detected in high levels, such as CODTOTAL (in eight rivers), TSS (in six rivers), TS (in two rivers), Al (in nine rivers), Zn (in eight rivers), Pb (in three rivers), Cu (in three rivers), Fe (in two rivers), and Mn (in Machángara River). Our results agree with other studies in Latin America (such as Colombia, Brazil, and Peru) reporting similar contamination in water resources used for agriculture, livestock, and human consumption. Overall, Guayas, Guayllabamba, and Machángara Rivers showed the highest levels of physicochemical parameters (such as CODTOTAL and TSS) and metal concentrations (such as copper, zinc, aluminum, iron, and manganese). Further studies should evaluate contamination sources and public health impact.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determining the microbial and chemical contamination in Ecuador’s main rivers

Vinueza

Ochoa‐Herrera

Maurice

et al. 2021

Sci Rep

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“…Various assessment models have been widely used to assess the ecological impacts of land use in urbanization areas. Previous studies have analyzed the effects on ecological water quality [37], net primary productivity [38], dust emissions [39], and ecological functional vulnerability [40]. These evaluation models provide an important reference for regional sustainable land management.…”

Section: County Scalementioning

confidence: 99%

Coastal Landscape Vulnerability Analysis in Eastern China—Based on Land-Use Change in Jiangsu Province

Zhou

Liu

Zhu

2020

IJERPH

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The unreasonable land use in rapid urbanization areas induced by large-scale urban construction activities have caused massive ecological issues. In this study, landscape vulnerability index (LVI) and landscape human interference index (LHAI) were originally addressed and calculated using multi-temporal land-use data from 2000 to 2015. Then, the spatial-temporal relationship assessment model of landscape fragility caused by human activities were constructed for each county of Jiangsu Province, China, so as to analyze the spatial distribution of landscape vulnerability and determine the impacts of artificial disturbance on landscape vulnerability. The results showed: (1) The number of counties with middle and high landscape vulnerability increased from 20 in 2000 to 27 in 2015 with a peak value (33) in 2010. (2) Counties with high-intensity human activities showed an upward trend. (3) Land use generally has a significant and diverse impact on landscape vulnerability. At the county level, the LVI was positively correlated with the LHAI before 2010 and was followed by a negative correlation of them. As concluded from this study, a total of four sub-regions (continuous benefit zones, variable benefit zones, continuous harmful zones, and variable harmful zones) have been identified for sustainable landscape management in the future. (4) The LVI suggests that the landscape vulnerability in Jiangsu did not continue to deteriorate in the study period. Further, accelerated land exploitation has produced a positive impact on regional economic development and ecological protection. This study provided an effective method set for analyzing the environmental impacts caused by human activities and promoting future ecosystem management in coastal areas.

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“…Besides the natural inputs from terrestrial ecosystems, anthropogenic activities such as fertilization or wastewater discharges can lead to elevated nutrient inputs which in turn can lead to an increase in GHG emissions from inland water bodies. In urban areas, land-use changes and the discharges from sewers and wastewater treatment plants (WWTPs) have deteriorated river water quality by causing extensive modification in biochemical reactions and hydro-and morphology characteristics (Damanik-Ambarita et al, 2018). These anthropogenic sources were estimated to account for at least 10% of the global N2O emissions from rivers to the atmosphere (Beaulieu et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effects of land use and water quality on greenhouse gas emissions from an urban river system

Jerves-Cobo

Barthel

et al. 2020

Preprint

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Abstract. Rivers act as a natural source of greenhouse gases (GHGs) that can be released from the metabolisms of aquatic organisms. Anthropogenic activities can largely alter the chemical composition and microbial communities of rivers, consequently affecting their GHG emissions. To investigate these impacts, we assessed the emissions of CO2, CH4, and N2O from Cuenca urban river system (Ecuador). High variation of the emissions was found among river tributaries that mainly depended on water quality and neighboring landscapes. By using Prati and Oregon Indexes, a clear pattern was observed between water quality and GHG emissions in which the more polluted the sites were, the higher were their emissions. When river water quality deteriorated from acceptable to very heavily polluted, their global warming potential (GWP) increased by ten times. Compared to the average estimated emissions from global streams, rivers with polluted water released almost double the estimated GWP while the proportion increased to ten times for very heavily polluted rivers. Conversely, the GWP of good-water-quality rivers was half of the estimated GWP. Furthermore, surrounding land-use types, i.e. urban, roads, and agriculture, significantly affected the river emissions. The GWP of the sites close to urban areas was four time higher than the GWP of the nature sites while this proportion for the sites close to roads or agricultural areas was triple and double, respectively. Lastly, by applying random forests, we identified dissolved oxygen, ammonium, and flow characteristics as the main important factors to the emissions. Conversely, low impact of organic matter and nitrate concentration suggested a higher role of nitrification than denitrification in producing N2O. These results highlighted the impacts of land-use types on the river emissions via water contamination by sewage discharges and surface runoff. Hence, to estimate of the emissions from global streams, both their quantity and water quality should be included.

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Impact assessment of local land use on ecological water quality of the Guayas river basin (Ecuador)

Cited by 20 publications

References 58 publications

Determining the microbial and chemical contamination in Ecuador’s main rivers

Determining the microbial and chemical contamination in Ecuador’s main rivers

Coastal Landscape Vulnerability Analysis in Eastern China—Based on Land-Use Change in Jiangsu Province

Effects of land use and water quality on greenhouse gas emissions from an urban river system

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