Nitrogen nutrients in a subtropical river: temporal variation and analysis at different spatial scales

Moncayo‐Estrada, Rodrigo; Escalera-Gallardo, Carlos; Arroyo-Damián, Miriam; Campos-Campos, Oswaldo; Silva-García, José Teodoro

doi:10.1071/mf16344

Cited by 5 publications

(3 citation statements)

References 76 publications

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“…Although this is to be expected because they describe the environment where the organisms directly develop [46], they also indirectly reflect the impacts of the activities that occur at a larger scale around the river such as agricultural activities and (in some other rivers) coal mining [77,78]. This has been described in other studies where the physicochemical variables in the water and the river characteristics are analyzed [5,79]…”

Section: Discussionmentioning

confidence: 96%

Biotic Integrity, Water Quality, and Landscape Characteristics of a Subtropical River

Gudiño-Sosa

Moncayo‐Estrada

Velázquez-Machuca

et al. 2023

Water

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The integrity of rivers is affected by anthropogenic activities at different spatial scales, from basin and landscape levels to the direct effects on the river and aquatic life. Our objective was to study these effects on the subtropical La Pasión River, analyzing environmental, geomorphological, habitat and water quality, and macroinvertebrates. We sampled the dry season (March 2022) because the river presented stable conditions. We selected the most influential variables in each spatial scale and determined their relationship with the indexes of quality characteristics and aquatic life in the river using multivariate statistics. Most sites (≈65%) had medium water and suboptimal habitat quality status, meanwhile half the sites had regular biotic integrity status; without finding coincidence in the quality of the different indexes applied, all sites indicated a high gradient of degradation from the origin to the mouth of the river. The presence of some families (e.g., Culicidae, Chironomidae, Lumbriculidae) indicated organic matter contamination. The main variables that significantly classified the river quality and integrity structure were water flow, turbidity, habitat embeddedness, and sulfates (χ2 = 0.1145, p < 0.01). It is concluded that the affected sites received wastewater without prior treatment and presented physical barriers such as irrigation channels.

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Section: Discussionmentioning

confidence: 96%

Biotic Integrity, Water Quality, and Landscape Characteristics of a Subtropical River

Gudiño-Sosa

Moncayo‐Estrada

Velázquez-Machuca

et al. 2023

Water

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“…This situation is reflected in the organic pollution with mainly domestic pollution sources of the investigated urban river waters. The anthropogenic ammonium sources increasing with the growing population have led to a high concentration of nitrogen in the form of ammonium in the river through the direct discharge of wastewater or via runoff in this kind of low-income cities (Tromboni and Dodds, 2017;Moncayo-Estrada et al 2017). The phosphorus emissions from detergents and household food consumption constituted primary sources of phosphorus pollution in water (Xiong et al 2020).…”

Section: Discussionmentioning

confidence: 99%

Assessment of urban river water pollution with urbanization in East Africa

Chen

Kimirei

Cheng

et al. 2022

Environ Sci Pollut Res

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Anthropogenic pollution plays an important part in deteriorating the water quality of rivers all over the world, especially in urban areas of Africa where water quality monitoring is still seriously constrained by the limited test facility and capability. In this study, for evaluating the impact of urbanization on the river water quality, we investigated four typical urban rivers of Tanzania through the upper-urban-down gradient assessment approach and analyzed by water quality index (WQI) and statistical methods. The physicochemical indices monitored in these rivers revealed that the contents of those indicators of TN, TP, PO43−, NH4+, CODMn, and NO3− were accumulated significantly in the lower reaches of the cities, which indicated the life-type pollution characteristics in such urban rivers of Africa. The following main conclusions are achieved from this study. The water quality of 30% of the investigated river sections is in the medium to good status based on the subjective WQI with sensory factors included. Moreover, the sections with obvious water quality decline are mainly limited to the river segments within the urban central area, and severe pollution of water bodies is closely related to large cities, indicating an increasing pollution tendency with the quickly growing population. Therefore, to help formulate water pollution control policies in response to the rapid urban expansion in African countries, it is necessary to adopt an economical and feasible method to carry out early monitoring of surface water quality timely.

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“…Although the basin has a positive water balance, a continuous degradation trend was reported and it has been related to unbulance human water use, with the consequent reduction in the main river flow, increased discharge of wastewater, deforestation and erosion. In addition, the presence of nutrients in the water was related, at the landscape level, to the agricultural area [23].…”

Section: Study Areamentioning

confidence: 99%

Historical Delineation of Landscape Units Using Physical Geographic Characteristics and Land Use/Cover Change

et al. 2018

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Landscape units are conceived as a part of the territory that share similar physical and geographic characteristics. Their delineation can contribute to identify the physical and social dynamics that emerge in the spatial environment and to propose strategies of planning and management of the territory. The main objective was to make a historical delineation of landscape units in the Duero river basin that demonstrate the dynamics of changes in the territory, the description of the actors involved, and the affectations in the natural and social environment. We analyzed the vegetation change and urban growth from 1983 to 2014, incorporating climatic, edaphic, and topographic variables. A Principal Component Analysis was performed with the information and results were used in Maximum Likelihood procedure to define different clusters based on environmental characteristics. We defined five categories from the Landsat images. Results showed landscape units with homogeneous environmental characteristics and some differences in the units' delineation were mainly influenced by political and socioeconomic factors. Temporally there was an increased tendency of landscape units, three in 1983, nine in 1990, 1995, 2000 and 2011, and eight in 2014. This increase resulted from territory fragmentation because of berries and avocado cultivars expansion over wooded area.

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Nitrogen nutrients in a subtropical river: temporal variation and analysis at different spatial scales

Cited by 5 publications

References 76 publications

Biotic Integrity, Water Quality, and Landscape Characteristics of a Subtropical River

Biotic Integrity, Water Quality, and Landscape Characteristics of a Subtropical River

Assessment of urban river water pollution with urbanization in East Africa

Historical Delineation of Landscape Units Using Physical Geographic Characteristics and Land Use/Cover Change

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