Precipitation, landscape properties and land use interactively affect water quality of tropical freshwaters

Nobre, Regina L. G.; Caliman, Adriano; Cabral, Camila Rodrigues; Araújo, Fernando de Carvalho; Guérin, Joris; Dantas, Fabíola da Costa Catombé; Quesado, Letícia Barbosa; Venticinque, Eduardo Martins; Guariento, Rafael Dettogni; Amado, André Megali; Kelly, Patrick T.; Vanni, Michael J.; Carneiro, Luciana S.

doi:10.1016/j.scitotenv.2020.137044

Cited by 77 publications

(32 citation statements)

References 74 publications

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“…According to the historical behavior of climatological data, the climatological parameter that displayed the greatest variations during the rainy season was precipitation ( Figure 2A ), with July being the month that historically receives the highest rainfall, and consequently, an intensive runoff of pollutants to the lake. Tropical and subtropical lakes are more susceptible to excessive pollutant runoff, since the rainy season is very intense and changes in water quality parameters are reflected even faster in shallow and small lakes ( Nobre et al, 2020 ). These trends are strongly associated with the lowest ES-WQI values observed during the month of July in Lake Cajititlán ( Figure 2F ), as well as with the greatest variations in the TN:TP ratio observed during the rainy season ( Figure 2E ).…”

Section: Resultsmentioning

confidence: 99%

Rapid Changes in the Phytoplankton Community of a Subtropical, Shallow, Hypereutrophic Lake During the Rainy Season

Díaz-Torres

Anda²,

Lugo-Melchor³

et al. 2021

Front. Microbiol.

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Lake Cajititlán is a small, shallow, subtropical lake located in an endorheic basin in western Mexico. It is characterized by a strong seasonality of climate with pronounced wet and dry seasons and has been classified as a hypereutrophic lake. This eutrophication was driven by improperly treated sewage discharges from four municipal wastewater treatment plants (WWTPs) and by excessive agricultural activities, including the overuse of fertilizers that reach the lake through surface runoff during the rainy season. This nutrient rich runoff has caused algal blooms, which have led to anoxic or hypoxic conditions, resulting in large-scale fish deaths that have occurred during or immediately after the rainy season. This study investigated the changes in the phytoplankton community in Lake Cajititlán during the rainy season and the association between these changes and the physicochemical water quality and environmental parameters measured in the lake’s basin. Planktothrix and Cylindrospermopsis were the dominant genera of the cyanobacterial community, while the Chlorophyceae, Chrysophyceae, and Trebouxiophyceae classes dominated the microalgae community. However, the results showed a significant temporal shift in the phytoplankton communities in Lake Cajititlán induced by the rainy season. The findings of this study suggest that significant climatic variations cause high seasonal surface runoff and rapid changes in the water quality (Chlorophyll-a, DO, NH4+, and NO3–) and in variations in the composition of the phytoplankton community. Finally, an alternation between phosphorus and nitrogen limitation was observed in Lake Cajititlán during the rainy season, clearly correlating to the presence of Planktothrix when the lake was limited by phosphorus and to the presence of Cylindrospermopsis when the lake was limited by nitrogen. The evidence presented in this study supports the idea that the death of fish in Lake Cajititlán could be mainly caused by anoxia, caused by rapid changes in water quality during the rainy season. Based on our review of the literature, this is the first study on the phytoplankton community in a subtropical lake during the rainy season using high throughput 16S rRNA and 18S rRNA amplicon sequencing.

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Section: Resultsmentioning

confidence: 99%

Rapid Changes in the Phytoplankton Community of a Subtropical, Shallow, Hypereutrophic Lake During the Rainy Season

Díaz-Torres

Anda²,

Lugo-Melchor³

et al. 2021

Front. Microbiol.

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“…and that "This is especially relevant for small and shallow lakes." ( [124] and references herein). Simpultaneously considering watersheds ('global pressures', here exemplified by population densities) and small buffer areas around water masses ('local pressures', here the contribution of cropland within 5-km buffer areas) as we did, allows taking into account both the influence of upstream inputs and of lateral 'immediate' inputs.…”

Section: Defining Scales Of Interestmentioning

confidence: 99%

“…There is nevertheless a growing consensus acknowledging that management options need to address both processes at large scales, (e.g., watershed-wide forest land cover and urban expansion), and processes that develop on small scales (e.g., agricultural activities and riparian vegetation near water bodies) [101,123]. This has been for example recently highlighted for lakes and reservoirs of Northeast Brazil, a climatically comparable region of Burkina Faso [124]. Authors emphasized that: "( .…”

Section: Defining Scales Of Interestmentioning

confidence: 99%

Small Reservoirs, Landscape Changes and Water Quality in Sub-Saharan West Africa

Cecchi

Forkuor

Cofie

et al. 2020

Water

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Small reservoirs (SRs) are essential water storage infrastructures for rural populations of Sub-Saharan West Africa. In recent years, rapid population increase has resulted in unprecedented land use and land cover (LULC) changes. Our study documents the impacts of such changes on the water quality of SRs in Burkina Faso. Multi-temporal Landsat images were analyzed to determine LULC evolutions at various scales between 2002 and 2014. Population densities were calculated from downloaded 2014 population data. In situ water samples collected in 2004/5 and 2014 from selected SRs were analyzed for Suspended Particulate Matter (SPM) loads, an integrative proxy for water quality. The expansion of crop and artificial areas at the expense of natural covers controlled LULC changes over the period. We found a very significant correlation between SPM loads and population densities calculated at a watershed scale. A general increase between the two sampling dates in the inorganic component of SPM loads, concomitant with a clear expansion of cropland areas at a local scale, was evidenced. Results of the study suggest that two complementary but independent indicators (i.e., LULC changes within 5-km buffer areas around SRs and demographic changes at watershed scale), relevantly reflected the nature and intensity of overall pressures exerted by humans on their environment, and locally on aquatic ecosystems. Recommendations related to the re-greening of peripheral areas around SRs in order to protect water bodies are suggested.

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“…The water pollution of Taihu Lake has been the focus of public attention [46]. Fast urbanization around the lake has taken place in recent decades, and pose challenges to water quality in the lake [12,47]. Our study area lies in a subtropical monsoon climate, with rainfall accumulated during April to September accounting for 70% of the average annual total rainfall of 1115.5 mm [48].…”

Section: Study Area and In-situ Observations 21 Study Areamentioning

confidence: 99%

Numerical Simulations of Non-Point Source Pollution in a Small Urban Catchment: Identification of Pollution Risk Areas and Effectiveness of Source-Control Measures

Pan

Guo

Yang

et al. 2021

Water

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Urban non-point source pollution is becoming a serious issue under the context of rapid urbanization and its impacts on surface hydrologic processes. The identification of non-point source risk areas and the effectiveness of source-control measures provides important first steps to improve the degrading aquatic environment but is challenged by the complex dynamics and variabilities of surface pollutants in urban environments. In this study, we investigate the spatial and temporal variabilities of non-point source pollution in a small urban catchment based on numerical simulations and in-situ samplings. Our results show that residential, industrial, and commercial land contribute to the most pollutant loadings and are the main constituents of the pollution risk area. Rainfall duration and intensity are the main factors in determining the temporal variations of urban non-point source pollution. There is no correlation between early drought days and pollution load. Numerical simulations show that it is more effective to increase urban vegetation coverage than to enhance road cleaning for effective non-surface pollution control. For enhanced road cleaning, it is more effective to improve the frequency of road cleaning than its efficiency. Our results provide important guidance for effective controls of non-point source pollution as well as the establishment of long-term surface pollutant monitoring network in complex urban environments.

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Precipitation, landscape properties and land use interactively affect water quality of tropical freshwaters

Cited by 77 publications

References 74 publications

Rapid Changes in the Phytoplankton Community of a Subtropical, Shallow, Hypereutrophic Lake During the Rainy Season

Rapid Changes in the Phytoplankton Community of a Subtropical, Shallow, Hypereutrophic Lake During the Rainy Season

Small Reservoirs, Landscape Changes and Water Quality in Sub-Saharan West Africa

Numerical Simulations of Non-Point Source Pollution in a Small Urban Catchment: Identification of Pollution Risk Areas and Effectiveness of Source-Control Measures

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