Effects of land-use changes on structural characteristics of tropical high-altitude Andean headwater streams

Taniwaki, Ricardo Hideo; Cassiano, Carla Cristina; Fransozi, Aline Aparecida; Vásquez, Katherine Vásquez; Posada, Raul G; Velásquez, Guillermo; Ferraz, Sílvio

doi:10.1016/j.limno.2018.10.002

Cited by 14 publications

(4 citation statements)

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“…The Environmental Protection Agency from the United States (USEPA) recommends these approaches for non-point water pollution monitoring (Dressing and Meals 2005 ). They have been used by different authors in the study of the relationship between land-use and water quality in high-mountain regions, including páramo ecosystems (Abella and Martínez 2012 ; Carney et al 1993 ; Chittoor Viswanathan et al 2016 ; González-Martínez et al 2019 ; Mojica and Guerrero 2013 ; Restrepo and Syvitski 2006 ; Ruiz et al 2017 ; Taniwaki et al 2019 ).…”

Section: Methodsmentioning

confidence: 99%

Effect of agricultural activities on surface water quality from páramo ecosystems

Rey-Romero

Domínguez

Oviedo-Ocaña

2022

Environ Sci Pollut Res

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Páramos are high mountain ecosystems strategic for water provision in South America. Currently, páramos are under threat due to agricultural intensification that impairs surface water sources. This research analyzed the effect of agriculture (spring onion— Allium fistulosum , potato— Solanum tuberosum , and livestock farming) on water quality in páramo ecosystems. A Hydrographic Unit upstream of the Jordan river catchment (Colombia) was selected and monitored in two different rainfall regimes, following the paired catchments and upstream-downstream approaches to compare water quality from natural and anthropic areas. Twenty-two parameters related to agricultural activities were analyzed (nutrients, salts, organic matter, sediments, and pathogens). The studied agricultural activities increased loads of surface water in quality in nitrates (0.02 to 2.56 mg N-NO 3 /L), potassium (0.13 to 1.24 mg K/L), and Escherichia coli (63 to 2718 FCU/100 mL), generating risks on the human health and promoting eutrophication. Total nitrogen and organic matter in the rainy season were higher than dry. BOD 5 , COD, turbidity, and E. coli were above international standards for direct human consumption. However, water could be used for irrigation, livestock watering, and aquatic life ambient freshwater. The results show that a small land-use change of almost 15% from natural páramo vegetation to agricultural uses in these ecosystems impairs water quality, limiting its uses, and the need to harmonize small-scale livelihoods in the páramo with the sustainability of ecosystem service provision. Supplementary Information The online version contains supplementary material available at 10.1007/s11356-022-21709-6.

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Section: Methodsmentioning

confidence: 99%

Effect of agricultural activities on surface water quality from páramo ecosystems

Rey-Romero

Domínguez

Oviedo-Ocaña

2022

Environ Sci Pollut Res

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“…La remoción de bosque de la zona ribereña de los arroyos de pasto y mixto probablemente explica el aumento de la temperatura del agua, producto del incremento en la incidencia de radiación solar sobre el cauce de los ríos (Lorion & Kennedy, 2009;Studinski et al, 2012;Taniwaki et al, 2019). Aunque la temperatura del agua es afectada por la sombra de la vegetación ribereña presente a lo largo del cauce por distancias que van de cientos de metros a varios kilómetros (Allan, 2004), Figura 4.…”

Section: Bosqueunclassified

Land use changes affect water quality and chlorophyll concentration in tropical streams

Castillo-Uzcanga

2023

Hidrobiológica

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Section: Bosqueunclassified

Untitled

2022

Hidrobiológica

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Background: Algal blooms have increased in frequency and intensity in recent decades. Excess nutrients of anthropogenic origin may be an essential factor that gives rise to these blooms. Goals: This work aimed to study an unusual bloom of the chlorophyte Chlamydomonas in an urban lake from a morphological and chemical approach. Methods: The study site was a small lake located in Cantera Oriente, Mexico City. Sampling was performed in February 2016 (the cold-dry season); environmental variables were measured in situ, and surface samples were obtained for organism abundance and chlorophyll-a concentration. An additional sample was freeze-dried for chemical analyses, and another sample was fixed in glutaraldehyde for ultrastructural studies by SEM, TEM, LM, and confocal microscopy, using the stain Nile red to detect the presence of intracellular lipids. Results: The results of morphological observations agreed with the characteristics of the description of C. reinhardtii. The bloom abundance values were high (6.98 x 10 5 ± 1.37 x 10 5 cells mL -1 ), confirmed by the high values of chlorophyll-a concentration (5548 ± 796 µg L -1 ). The carbohydrate:protein ratio of the cells (0.15) indicates high protein synthesis during the enormous algal proliferation. The low lipid content (6.5 %) is associated with the absence of intracellular lipid granules and may be related to the availability of nitrogen and phosphorus and high vegetative multiplication. C. reinhardtii synthesizes essential fatty acids, such as alpha-linolenic acid (Omega 3), a precursor of beneficial lipids in human cardiovascular and neurological health. Conclusions: The bloom consisted mainly of Chlamydomonas reinhardtii and it significantly correlated with the chlorophyll a concentration, indicating high photosynthetic capacity and active cell division. Linoleic acid (Omega 3), an important substance for human health, was present in the alga composition. A controlled culture of this alga could improve the Omega 3 concentration offering a biotechnological resource for the future.

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Effects of land-use changes on structural characteristics of tropical high-altitude Andean headwater streams

Cited by 14 publications

References 47 publications

Effect of agricultural activities on surface water quality from páramo ecosystems

Effect of agricultural activities on surface water quality from páramo ecosystems

Land use changes affect water quality and chlorophyll concentration in tropical streams

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