Comparative study of carbonic anhydrase activity in waters among different geological eco-environments of Yangtze River basin and its ecological significance

Nzung'a, Sila Onesmus; Pan, Weisan; Shen, Taiming; Li, Wei; Qin, Xiaoqun; Wang, Chenwei; Zhang, Liankai; Yu, Liang

doi:10.1016/j.jes.2017.05.027

Cited by 8 publications

(6 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The concentration of Ca 2+ was measured using a Aquamerck Calcium Kit (Merck) with an accuracy of ±0.1 mg/L. The concentration of DIC was measured using an Aquamerck Alkalinity Kit (Merck) with an accuracy of ±0.05 mmol/L ( Nzung’a et al, 2018 ).…”

Section: Methodsmentioning

confidence: 99%

Community characteristics of autotrophic CO2-fixing bacteria in karst wetland groundwaters with different nitrogen levels

Wang

Cheng

et al. 2022

Front. Microbiol.

Self Cite

View full text Add to dashboard Cite

Karst wetlands are important in the global carbon and nitrogen cycles as well as in security of water resources. Huixian wetland (Guilin) is the largest natural karst wetland in China. In recent years, groundwater nitrogen pollution has increasingly affected the wetland ecosystem integrity due to anthropogenic activities. In this study, it was hypothesized that autotrophic microbial diversity is impacted with the advent of pollution, adversely affecting autotrophs in the carbon and nitrogen cycles. Autotrophic microbes have important roles in abating groundwater nitrogen pollution. Thus, it is of great significance to study the characteristics of autotrophic bacterial communities and their responses to environmental parameters in nitrogen-polluted karst groundwaters. The abundances of the Calvin–Benson cycle functional genes cbbL and cbbM as well as the autotrophic CO2-fixing bacterial communities were characterized in the karst groundwater samples with different levels of nitrogen pollution. The cbbM gene was generally more abundant than the cbbL gene in the groundwater samples. The cbbL gene abundance was significantly positively correlated with dissolved inorganic nitrogen (DIN) concentration (P < 0.01). In the autotrophic CO2-fixing bacterial communities, Alphaproteobacteria, Betaproteobacteria, and Gammaproteobacteria of the phylum Proteobacteria were predominant. At the genus level, Rubrivivax and Methylibium were the dominant cbbL gene containing genera, while Halothiobacillus and Endothiovibrio were the dominant genera for the cbbM gene. The abundance of autotrophic CO2-fixing bacterial communities increased but their diversity decreased with the inflow of nitrogen into the karst groundwater system. The community structure of autotrophic CO2-fixing bacteria in the groundwaters was also significantly affected by environmental factors such as the carbonic anhydrase (CA) activity, dissolved inorganic carbon (DIC) concentration, temperature, and oxidation-reduction potential (ORP). Nitrogen inflow significantly changed the characteristics of autotrophic CO2-fixing bacterial communities in the karst groundwaters. Some key genera such as Nitrosospira and Thiobacillus were clearly abundant in the karst groundwaters with high nitrogen levels. Their respective roles in nitrification and denitrification impact nitrogen removal in this ecosystem. The findings in this study provide an important reference for biological abatement of nitrogen pollution in the karst groundwater system.

show abstract

Section: Methodsmentioning

confidence: 99%

Community characteristics of autotrophic CO2-fixing bacteria in karst wetland groundwaters with different nitrogen levels

Wang

Cheng

et al. 2022

Front. Microbiol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…A GIS-based approach proposes the results of the explicit and feasible multiscenarios, which facilitates the effective management of ecological space. The results show the spatial characteristics of eco-space for maintaining water security, biodiversity, disaster protection and recreation [74][75][76].…”

Section: Introductionmentioning

confidence: 95%

“…The ecological importance evaluation of regional space emphasizes the harmonious development between production space, living space, and ecological space, focuses on the symbiosis between humans and other organisms, and maintains the natural foundation of urban development using applied principles in ecology. Based on the analysis of ecological characteristics, ecological importance evaluation examines the spatial distribution of regional ecological importance and provides measures for preventing ecological security issues from regional development and construction [73][74][75][76]. A GIS-based approach proposes the results of the explicit and feasible multiscenarios, which facilitates the effective management of ecological space.…”

Section: Introductionmentioning

confidence: 99%

Spatial pattern of the ecological environment in Yunnan Province

Wang

Ding

2021

PLoS ONE

View full text Add to dashboard Cite

Ecological science focuses on the structure and function of the natural environment. However, the study of ecological environments primarily focuses on single-element research and lacks a comprehensive perspective. To examine ecological environmental trends on different scales, the present paper selected Yunnan Province as the study area. Chemical oxygen demand, rocky desertification, forest coverage, natural disaster data and spatial analysis methods were used to obtain the ecological environmental characteristics of each county and construct a comprehensive evaluation method of the ecological environment. The present paper revealed that the environmental capacity in Yunnan Province was at a moderate level, the ecological environment fragility was remarkable, the significance of the ecological environment was very high, natural disasters occurred frequently, and spatial differentiation between ecological environments was obvious. The province may be divided into three functional areas: the comprehensive-balanced area, the efficiency-dominated area and the environment-dominated area. Central Yunnan was a key development zone and the main area for the manufacturing and service industries, which were built as a modern industrial system in Yunnan Province. The ecological environment in northwestern Yunnan and southern Yunnan is of high significance, and this region was an ecological environment protection area that was important area for the construction of the modern agricultural system in Yunnan Province. To achieve sustainable development of the ecological environment, the spatial characteristics of the ecological environment must be determined at the county scale.

show abstract

“…[20] Recorded elevated levels of Diazinon, Fenitrothion, Cyhalothrin, Malathion, bis (2-ethylhexyl) phthalate, Dimethoate while analyzing of organic contaminants and the physico-chemical properties of borehole water of Maili-nne Estate and Sosiani village, Uasin Gishu County, Kenya. [21] detected the following from Athi and Kauthulini River water sources; total coliforms mean ranged between 10 and 23,830 CFU/100 mL, Escherichia coli mean range between 10 and 3480 CFU/100 mL, Vibrio cholera, Shigella sp., Salmonella sp., Klebsiella sp., Streptococcus faecalis and Clostridium perfringens were also detected. [22] While assessing microbiological water quality of sand dams in southeastern Kenya indicated that the water from test holes and covered wells was microbiologically of better quality than the scoop holes with median TTC levels of 0/100 mL and 159/100 mL respectively.…”

Section: Introductionmentioning

confidence: 99%

“…[22] While assessing microbiological water quality of sand dams in southeastern Kenya indicated that the water from test holes and covered wells was microbiologically of better quality than the scoop holes with median TTC levels of 0/100 mL and 159/100 mL respectively. However, the median values of turbidity for both scoop holes (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) and covered wells (5-10 NTU) exceed the World Health Organisation (WHO) guideline values. In addition the conductivity of water from 23% of scoop holes and 26% of covered wells is above the recommended WHO limit.…”

Section: Introductionmentioning

confidence: 99%

Sources of Water Pollution and Selected Physicochemical Parameters of the Nyakomisaro River in Kisii County, Kenya

Kerich¹,

Fidelis²

2020

AJBES

View full text Add to dashboard Cite

Water is the most vital natural resource in existence as all forms of life depend on it. However, this resource is constantly polluted by human activities. Pollution of rivers is a big challenge not only in Kisii County but as a Country at large. Purposive sampling was used to identify the study area and random sampling was used to collect questionnaires. Water samples were also collected from the study site and physicochemical parameters were analysed in the laboratory. Primary data was analysed descriptively while laboratory data was analysed descriptively and statistically using t-test. Dumping of liquid and solid waste (37.2%) and farming along the river banks (34.9%) were some of the causes of pollution in River Nyakomisaro. The two main economic activities affecting the river are sand harvesting (30.6%) and farming along the river banks (26.8%). The mean value of COD, BOD, TDS, Do, pH, Ec and Temp in Nyaguru (upstream) sampling points were 74.58±13.

show abstract

Comparative study of carbonic anhydrase activity in waters among different geological eco-environments of Yangtze River basin and its ecological significance

Cited by 8 publications

References 36 publications

Community characteristics of autotrophic CO2-fixing bacteria in karst wetland groundwaters with different nitrogen levels

Community characteristics of autotrophic CO2-fixing bacteria in karst wetland groundwaters with different nitrogen levels

Spatial pattern of the ecological environment in Yunnan Province

Sources of Water Pollution and Selected Physicochemical Parameters of the Nyakomisaro River in Kisii County, Kenya

Contact Info

Product

Resources

About