Search

The primary objective of this research study is to assess the water quality of La Compañía and Nexapa rivers in Los Volcanes Biosphere Reserve (Mexico) through the analysis of physical and chemical parameters during wet and dry periods. Twelve locations with different land uses are examined from September 2018 until June 2019. Twenty environmental variables are assessed in situ and in the laboratory in accordance with Mexican environmental regulations. Gathered data are compared with the standards established in the regulations for water for human consumption and aquatic life. The results show that BOD, COD, N-NH4+, TSS, SS, and heavy metals (Cd, Cr, Pb and Fe) exceed permissible limits. The soils with the greatest impact on water quality are seasonal agricultural soils and forest disturbed. It is concluded that human activities and volcanic emissions affect river water quality--an improvement alternative is phytoremediation with native species. [ABSTRACT FROM AUTHOR]

Copyright of Revista Ciência & Saúde Coletiva is the property of Associacao Brasileira de Pos-Graduacao em Saude Coletiva and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Environmental & Social Management Journal / Revista de Gestão Social e Ambiental is the property of Environmental & Social Management Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Se identificaron los impactos ambientales que se manifiestan en la cuenca del río Aserrío para evaluar la calidad de las aguas para su uso como agua potable y en la agricultura. Se utilizaron datos hidroquímicos que comprobaron que entre las zonas más afectadas del río se encuentran los repartos La Playa, Moa Centro, El Caribe y El Atlántico. El agua del río no es apta para el consumo humano, pero puede ser utilizada para el riego en la agricultura.

En Colombia, los estudios de calidad del agua se han basado en su gran mayoría en información fisicoquímica o bacteriológica, y solamente en las últimas décadas se ha comenzado a integrar e implementar la bioindicación. El propósito del estudio fue caracterizar la calidad del agua del río Frío, usando macroinvertebrados bentónicos como indicadores biológicos, junto con parámetros fisicoquímicos. Con esta integración entre los índices bióticos y fisicoquímicos se determinó la calidad del agua de forma más precisa, debido a que se generó un acercamiento más detallado al estado del río Frío. Una vez muestreados e identificados los macroinvertebrados, se calcularon los índices de calidad BMWP/Col, ASTP, IBF, EPT, y los índices de biodiversidad Shannon-Weaver, riqueza específica, diversidad de Margalef y Menhinick. El número total de individuos resultado del estudio en la cuenca correspondió a 687, representados por 12 órdenes, 24 familias y 25 géneros. Adicionalmente, se llevaron a cabo un análisis de varianza y un análisis multivariante, a través de una correlación canónica. Finalmente, se determinó que la calidad del agua del río Frío es moderadamente contaminada; además, presenta una baja biodiversidad en las especies de macroinvertebrados, y se encontró que el resultado de los índices son independientes de las temporadas climáticas.

Copyright of Environmental & Social Management Journal / Revista de Gestão Social e Ambiental is the property of Environmental & Social Management Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Biodiversity is confronted globally by multiple stressors. Environmental policies must regulate these stressors to achieve targets, but how should that be done when the outcomes of limits on one stressor are contingent on other stressors, about which there is imperfect knowledge? Deriving regulatory frameworks that incorporate these contingencies is an emerging challenge at the science–policy interface. To be fit for implementation, these frameworks need to facilitate the inherently sociopolitical process of policy implementation and account transparently for uncertainty, such that practitioners and other stakeholders can more realistically anticipate the range of potential outcomes to policy. We developed an approach to quantify stressor limits that explicitly accounts for multistressor contingencies. Using an invertebrate data set collected over 30 years throughout New Zealand, we combined ecological and ecotoxicological models to predict biodiversity loss as a function of one stressor, treating multistressor contingencies as a form of uncertainty about the outcomes of limits on that stressor. We transparently accounted for that uncertainty by presenting regulatory limits as bands bounded between optimistic and pessimistic views that practitioners may have about the local context within which limits are applied. In addition to transparently accounting for uncertainties, our framework also leaves room for practitioners to build stakeholder consensus when refining limits to suit different local contexts. A criticism of this open, transparent approach is that it creates too much scope for choosing limits that are lenient on polluters, paralyzing on‐the‐ground management of multiple stressors, but we demonstrate that this is not necessarily the case. [ABSTRACT FROM AUTHOR]

Water quality varies along the stream network; thus, considering the directional, dendritic nature of stream networks with surrounding landscape variables is essential in explaining spatial variations of water quality. Using a spatially extensive stream temperature monitoring effort in the Clackamas River Basin in the United States, we first compare spatial scales of analysis of atmospheric, landscape, and in-stream explanatory variables through their correlation with summer stream temperatures. We then derive a predictive stream temperature model with factors representing the spatial variation of local climate, recent wildfire effects, and discharge. Finally, we compare nonspatial multiple linear regression to a spatial stream network (SSN) model to assess the combined importance of the spatial scale of analysis and flow-connected stream distance in explaining total variation in stream temperatures. Most explanatory variables show the most highly significant relationships to stream temperature when derived as a percentage of the total upstream area above observation sites. Elevation and vegetation cover, however, were most significantly correlated to stream temperature at the riparian buffer area scale and the local reach contributing area scale, respectively. Multiple regression analysis using total upstream burned area, total upstream area with underlying High Cascades geology, and the elevation within the 100-m-wide riparian area explained 81 percent of variation in stream temperature. SSN outperformed this nonspatial statistical model, however, in explaining the total variation in stream temperature. These comparisons of scaled data sets demonstrate both the local and cumulative upstream effects on stream temperature, providing a spatial network-informed framework to those prioritizing watershed restoration and wildfire recovery activities. [ABSTRACT FROM AUTHOR]

The article focuses on the reassessment of the Integrated Watershed Health Assessment Framework (IWHF) and its application in Ethiopia's Weyib watershed. Topics include the evaluation of global and local weights of the IWHF, the current status of the Weyib watershed health index, and the implications for Ethiopian water policy and management practices.

Objetivo: Examinar la base de datos de monitoreo de calidad del agua del Fideicomiso Río Sonora durante el período 2014-2019. Metodología: En primer lugar, los valores reportados en el monitoreo se confrontaron con los límites máximos permitidos en la norma oficial vigente, la guía de la OMS y los lineamientos para la protección de vida acuática; después, se resumieron los casos fuera del límite por sitio y mes para tener una perspectiva espacio-temporal de la base de datos. Resultados: Se encontraron ausencias de meses sin muestreo alguno, inclusive en los períodos más críticos posteriores al derrame; aun así, se confirmó la presencia extraordinaria de valores por fuera del límite permitido en el período más cercano al derrame y la permanencia de ciertos parámetros en los años subsecuentes a la contingencia. Limitaciones: Por tratarse de un primer acercamiento a la base de datos ya completa, no se analizaron las agrupaciones de parámetros por fuera del límite que se presentaron en ciertos meses y sitios, sin profundizar en todos los riesgos toxicológicos posibles. Valor: Alto mérito empírico para el estudio de los impactos de los desastres de origen minero. Conclusiones: El análisis de la base de datos del fideicomiso permite tener una perspectiva global del impacto en la calidad del agua del derrame del río Sonora y, asimismo, deja ver las fallas en la atención al desastre en cuanto al monitoreo.

La calidad del agua está relacionada con parámetros biológicos, químicos y físicos y el grado de concentración de estos componentes presentes en el agua y que, de acuerdo a su nivel de presencia, afectan el consumo del recurso hídrico. Por ello, es necesario analizar la presencia de estos elementos en el agua del Estero El Macho en la ciudad de Machala, Ecuador a través de la aplicabilidad del método estadístico. El diseño de la investigación es correlacional con el apoyo de métodos estadísticos, regresión lineal múltiple y análisis de componentes principales presentes en las aguas. Los resultados evidenciaron la presencia de agentes tales como: Coliformes fecales, demanda bioquímica de oxígeno, demanda química de oxígeno, hierro y oxígeno disuelto fuera de los límites permitidos para un agua de calidad, por consiguiente, el agua del estuario de El Macho no cumple los criterios de calidad para poder ser consumida sin problemas. Se concluye que se deben desarrollar políticas para mitigar la presencia e impacto de estos componentes identificados, que afectan la calidad del agua.

La cuenca baja del río Lurín es una de las últimas grandes extensiones de áreas verdes en Lima, capital de Perú, sin embargo es afectada por diversas actividades antrópicas. Ante esta situación, y con el objetivo de mejorar el manejo de los recursos hídricos, se implementó un modelo de calidad del agua con el módulo GESCAL del sistema de soporte a la decisión AQUATOOL. La construcción de la red hidrográfica del río se hizo a partir de los datos recogidos en salidas de reconocimiento, mientras que para modelar la calidad del agua del tramo bajo del río se desarrolló un programa de monitoreo que tuvo como principales parámetros al oxígeno disuelto, DBO5 y Escherichia coli. Con la información obtenida se determinaron primero los coeficientes de degradación de materia orgánica, desoxigenación y reaireación de las secciones del río, y finalmente se parametrizó el modelo. La calibración del modelo en oxígeno disuelto obtuvo un rendimiento de “bueno” a “muy bueno”, con valores de 0.77, 0.23 y 0.8058 para E, RSR y r2, respectivamente; para el caso de la DBO5, se obtuvieron valores de 0.99, 0.01 y 0.9995 para E, RSR y r2, respectivamente; y para la Escherichia coli, valores de 0.99, 0.01 y 0.9993 para E, RSR y r2, respectivamente. Finalmente, se simularon cuatro escenarios, a partir de los cuales se determinó que para alcanzar los objetivos ambientales es necesario mejorar los procesos de las plantas de tratamiento de aguas residuales (PTAR) Manchay y San Bartolo; clausurar el canal de regadío proveniente de la capilla de la zona, e implementar una PTAR en el distrito de Pachacámac. El estudio demuestra la utilidad del sistema AQUATOOL/GESCAL en la toma de decisiones informadas para la gestión de los recursos hídricos a nivel de cuenca.

The quality of water for human consumption is extremely important, and its access is a fundamental challenge, especially in areas with contaminated water sources. This study evaluated the efficiency of pathogen removal through the implementation of Biosand Filters (FBA) in the waters from the Rimac River, to improve its quality. In the communities (115 users) Los Girasoles and Los Frutales, 13 FBA and two slow intermittent sand filters (FLAI) were randomly installed, this home water treatment system operated continuously for 113 days, where surveys were applied to the 30 participants. before and after the installation of the FBA, evaluating aspects related to waterand food consumption, such as water drinking practices, responsible use of water, hygiene, food purchase and exposure to contamination. The results showed that, during periods of greater water turbidity (flushes), the flow rate of the filters decreased, but the FBA achieved an efficiency of 99%, while the FLAI demonstrated greater stability in the water quality parameters. This makes them suitable for community applications of large volumes of water and use of technologies as public health tools, considering that the granulometry of the filter material is crucial for pathogen retention, and that the biological layer acts as an effective barrier for the elimination of microorganisms. contributing to obtaining purified water. [ABSTRACT FROM AUTHOR]

The article aims to review existing methodologies to assess heavy metal (HM) pollution associated with road sediment, which is discharged into urban water bodies. The systematic literature review used a citation frequency index (Q) to establish the importance of the variables considered. The results indicate that the key variables to be considered are as follows: Precipitation (Q = 0.83), total solids (0.70), heavy metals (0.61), hydrocarbons (0.32), solid waste (0.27) and runoff (0.23). The most relevant HMs are the following: Zn (0.79), Cu (0.76), Ni (0.68), Cr (0.65) and Pb (0.46). The evaluation methodologies detected are as follows: Chemical analysis (0.30), biological impact (0.29), numerical modeling (0.29), granulometric analysis (0.29) and laboratory simulations (0.22). The major HMs in road environments are Zn and Ni, and total solids can be used as indicators of HMs in road runoff. [ABSTRACT FROM AUTHOR]

The growing processes of urban expansion have led to changes in the biochemical and physical properties of the hydrological systems in watersheds, not only by altering the hydrological conditions of the territory, but also by introducing pollutants into water bodies. Thus, diffuse pollution from stormwater runoff is considered one of the main causes of water quality degradation in receiving waters in urban areas, especially in rainy regions such as the South American tropics, where urban development and management processes are generally poorly planned. This article presents the results of an evaluation of the relationship between land use and runoff water quality, taking into account different rainfall characteristics. Sampling was carried out in Medellín, Colombia, in areas with different land uses. Basic water quality parameters and some sources of urban pollution were studied. The results showed that parameters such as total suspended solids have a high variability, especially in the residential area, which makes it difficult to control the activities carried out there. The highest levels of pollution were found in the industrial area, where the presence of covers with very low or no permeability and the increase in anthropic activity cause a strong alteration in the quality of runoff water. These results open the door to question the impact of land use on the chemical composition of rainwater and promote a better understanding of surface runoff water pollution processes, thus providing a complete vision of the interactions in an urban ecosystem, establishing a key tool for water management in urban watersheds. [ABSTRACT FROM AUTHOR]

Copyright of Water & Landscape (WAL) / Agua & Territorio (AYT) is the property of Editorial de la Universidad de Jaen and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Environmental & Social Management Journal / Revista de Gestão Social e Ambiental is the property of Environmental & Social Management Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tecnología y Ciencias del Agua is the property of Instituto Mexicano de Tecnologia del Agua (IMTA) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Tecnología, Ciencia & Educación is the property of Centro de Estudios Financieros SL and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of World Water Policy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article analyzes the ruling of the Superior Court of Justice of Andalusia on March 20, 2024, which resolves an appeal by the Provincial Federation of Ecologists in Action against the dismissal of a license application for a livestock farm and pig farm. Issues such as the suspension of licenses due to urban planning modifications, the lack of reasoned response from the Administration, and the assessment of environmental impacts are discussed. Despite meeting the formal requirements, the Court dismisses the appeal, sparking debate on the importance of the precautionary principle and comprehensive evaluation of environmental impacts. [Extracted from the article]

Copyright of Revista de Ciencias Sociales (13159518) is the property of Revista de Ciencias Sociales de la Universidad del Zulia Venezuela and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This is a review of studies related with the effects generated by the fast-growing exotic plantations (PECR) of Pinus radiata and Eucalyptus spp. on water quality of watersheds in south-central Chile, at different spatial and temporal scales. The analyzed data comes from a region between 36° - 40° S in the Central Valley and includes both mountain ranges, the Coastal and the Andes. Studies on the watershed's capacity to export nutrients indicate that the conversion from native forests to forest plantations implies a net loss in nitrogen (N) and phosphorus (P) retention capacity. Consequently, watersheds with plantations coverage experience a net loss of these nutrients. Similarly, in watersheds dominated by Eucalyptus globulus, nitrogen retention decreases, especially NO3-N, and is partially reversed as a wider riparian vegetation is maintained. Studies of soil erosion and sediment transport losses show that clearcut harvesting has significant impacts on water quality, increasing sediment transport rates in streams. However, when soil conservation measures are practiced, erosion rates decrease significantly during forest harvesting. Some of the physical-chemical characteristics of the water, such as pH and temperature, are similar between streams with native forests and forest plantations. There is also a tendency for a decrease of richness and abundance of the macrobenthic invertebrates community due to the replacement of riparian vegetation by Eucalyptus spp. [ABSTRACT FROM AUTHOR]

Copyright of Revista Cientifica de la Facultade de Veterinaria is the property of Universidad del Zulia, Facultad de Ciencias Veterinarias and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Foco (Interdisciplinary Studies Journal) is the property of Revista Foco and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of World Water Policy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Son muchos los desafíos asociados a los microplásticos (MPs), destacando su presencia y efectos perjudiciales tanto en la salud humana como en el medio ambiente. Este trabajo presenta una posible solución propuesta por Captoplastic S.L (Captoplastic), una tecnología de captura y control de MPs en cualquier medio acuoso que se basa en la aglomeración y separación magnética de las partículas, logrando una alta eficacia de eliminación. También, se describe un método propio patentado por Captoplastic para el control de los MPs en cualquier muestra de agua, abordando las limitaciones actuales en las técnicas analíticas existentes, como el análisis en muestras complejas. Este estudio también determina la presencia y concentración de MPs en el vertido de una estación depuradora de agua residual urbana (EDAR). Se detalla la metodología utilizada, desde la preparación de muestras hasta los resultados experimentales, demostrando la efectividad del método en la detección y cuantificación de MPs en muestras reales de aguas residuales, validando la recuperación de estos contaminantes en un 96 %. Este avance tecnológico se presenta como una respuesta efectiva y prometedora para enfrentar el desafío global de la contaminación por MPs.

Este estudio propone estrategias de mejora continua y sostenibilidad para la Planta Tratamiento de Agua Potable (ptap) de la Institución Universitaria Antonio José Camacho (uniajc), utilizando herramientas de Lean Manufacturing. El objetivo es impactar positivamente en variables críticas como el desperdicio, el consumo de agua, el consumo energético, la capacidad de la planta y la calidad del agua tratada. Se realizó una caracterización completa de la planta y se identificaron los problemas existentes. Mediante un análisis detallado se determinó que el desperdicio de agua y la calidad del producto eran los principales desafíos por abordar. Se aplicaron herramientas como el diagrama de proceso, Jidoka, Value Stream Mapping, diagrama de causa raíz, amef, control visual, Andon y mantenimiento autónomo para proponer soluciones y mejorar la eficiencia de la planta, reduciendo los costos operativos y los problemas ambientales asociados, permitiendo a la planta adaptarse a las crecientes demandas futuras. Además, se evaluó el consumo energético y se propusieron medidas para reducirlo. Los resultados de la implementación de estas mejoras muestran un beneficio claro en términos de costos y bienestar para la Universidad y sus estudiantes.

Se sistematiza una experiencia de articulación entre universidad, escuelas y movimientos sociales involucrados en conflictos ambientales por contaminación del agua. Se promovió la educación ambiental y la apropiación social de tecnologías de desarrollo libre mediante el monitoreo participativo de contaminación del agua en humedales urbanos del Área Metropolitana de Buenos Aires (Argentina). Para ello, se utilizó un bioensayo basado en microalgas, acoplado a tecnologías de la información y la comunicación (TIC), desarrolladas por el grupo de Sensores Comunitarios (CoSensores). Se presentan reflexiones en torno al desarrollo de tecnologías libres desde una perspectiva de educación popular vinculada al pensamiento ambiental latinoamericano.

RESUMEN | El empleo de probióticos en el agua de cultivos acuícolas ha representado mejoras sustanciales en los rendimientos y en la calidad del agua. En este estudio se evaluó el desempeño del probiótico Lactiplantibacillus plantarum en el cultivo del camarón Penaeus vannamei entre las etapas de desarrollo nauplio a juvenil. Se utilizaron 10.000 nauplios distribuidos en dos tratamientos, desarrollados en estanques de cemento hasta llegar a la etapa de postlarva, cuando fueron traslados a estanques de geomembranas. En el tratamiento T1 se administró el probiótico en el agua de cultivo con una concentración de 109 UFC/ml, en una dosis inicial de 10 ml, que se incrementó gradualmente cada 15 d hasta alcanzar 50 ml; el tratamiento T2 (control) no recibió probiótico. Las variables evaluadas fueron: peso final (PF), longitud total final (LT), conversión alimenticia (FCA) y tasa de mortalidad (TM). Los resultados para T1 fueron: 4,42 ± 0,2 g (PF); 8,04 ± 0,12 cm (LT); 0,88 (FCA) y 10% (TM). Mientras que para T2 se alcanzaron los siguientes valores 3,76 g ± 0,2 (PF); 7,04 cm ± 0,13 (LT); 0,91 (FCA) y 40% (TM), encontrándose que en el T1 las variables PF, LT y TM tuvieron diferencias significativas con respecto al T2. Los valores promedio de los parámetros abióticos fueron: oxígeno disuelto 5,22 (T1) y 5,73 mg/L (T2); temperatura 29,2 (T1) y 29,9°C (T2); y pH 7,32 (T1) y 7,2 (T2). Se concluye que el uso del probiótico L. plantarum en el agua del cultivo es una alternativa viable para mejorar la producción de camarones P. vannamei durante su etapa de crecimiento. ABSTRACT | The use of probiotics in the water of aquaculture crops has represented substantial improvements in yields and water quality. In this study, the performance of the probiotic Lactiplantibacillus plantarum was evaluated in the culture of the shrimp Penaeus vannamei between nauplius and juvenile developmental stages. A total of 10,000 nauplii was used distributed in two treatments, developed in cement ponds until reaching the post larval stage, which were then transferred to ponds covered with geomembrane. Treatment T1 consisted of the administration of the probiotic in the culture water with a concentration of 10 CFU/mL, with an initial dose of 10 ml, which was gradually increased every 15 days until reaching 50 mL; treatment T2 (control) did not receive probiotics. The variables evaluated were final weight (PF), total final length (LT), feed conversion (FCA) and mortality rate (TM). The results for T1 were: 4.42 ± 0.2 g (PF); 8.04±0.12 cm (LT) ; 0.88 (FCA) and 10% (TM); while for T2 were: 3.76 ± 0.2 g (GP); 7.04 ± 0.13 cm (LT); 0.91(FCA) and 40% (TM). The parameters PF, LT, and TM in T1 were significantly different from T2. The average values of the abiotic parameters for treatments were dissolved oxygen 5.22 and 5.73 mg/lt; temperature 29.2 and 29.9°C; and pH 7.2 and 7.32, for treatment T1 and T2, respectively. It is concluded that the probiotic L. plantarum is a viable alternative to improve the production of the srhimp P. vannamei during its growth stage.

El presente estudio evalúa la variabilidad hidroquímica del río Asana por influencia de la quebrada Millune en Moquegua, Perú. Se analizó la información de monitoreos de calidad de agua durante el periodo 2010-2018 a través de los diagramas de Gibbs, las relaciones molares, el diagrama de Piper, el diagrama de Stiff y el modelo hidrogeoquímico PHREEQC para la identificación de los índices de saturación de los principales minerales a los que están expuestos los cuerpos de agua en evaluación. El análisis por componentes principales permitió la identificación de la variabilidad de la hidroquímica en función de la naturaleza de la fuente y su estacionalidad. Los resultados obtenidos muestran que las aguas de la quebrada Millune, afluente del río Asana, son de naturaleza ácida con presencia de iones de aluminio y manganeso en concentraciones elevadas respecto a lo establecido en el ECA agua (estándar de calidad ambiental de agua), a diferencia del río Asana, que presenta concentraciones bajas; ambos ríos son de naturaleza sulfatada cálcica. Se determinó que los iones aluminio y manganeso se deben a la meteorización del mineral alunita y erosión del suelo, aporte mineral, por el deshielo paulatino del nevado Arundani, ubicado en la cabecera de cuenca del río Asana. Finalmente, el río Asana, por su capacidad de amortiguamiento, neutraliza las aguas ácidas y disminuye la solubilidad de los cationes disueltos.

Water is among the inexhaustible resources but due to the admissible of chemical effluents in large quantities by dumping waste, sewage wastes, and industries discharge into the rivers; contamination of water in some other ways; uncontrollable biological activities; the weather conditions; havoc created by the humans, the quality of water become deteriorating day by day and also from the renewable resources it came to the verge of exhaustible resources. In the present scenario, there is a desideratum to control these particulates which directly or indirectly affect the quality of the water, and also there is a need to stop the overutilization of these precious resources and to deal with the amalgam of the biggest problem of the society i.e., to maintain water quality and quantity with the Multi-Criteria Decision Analysis (MCDA) to provide us a clear view of the parameters which impact the quality. Different parameters like Dissolved Oxygen, pH, Nitrate, and Feacal Coliform of water quality of river Yamuna at different locations are studied using the Entropy method which is used to find the objective weights of the criteria i.e., particulates here. This study majorly reveals the parametric estimations of water quality parameters to find the weightage of the parameters using the Entropy Method of MCDA so that government can take advanced and immediate steps concerning the parameters and also pose strict legal actions against those who are responsible for this major havoc. [ABSTRACT FROM AUTHOR]

The paper analyzes the quality of the water supplied by the potable water treatment plant Altos of Quintero to the city of Santiago de Cuba through the study of five consumers. The quality of the parameters analyzed was determined for pH, color, turbidity, residual free chlorine and determination of total and fecal coliforms, resulting in La Colonia, La Cervecería Hatuey and the Combined Milk, which residual free chlorine and turbidity are outside the norm in some occasions. The effects of the quality of drinking water coming from the potabilizer were mainly the deterioration of the infrastructure of the supply networks and poor storage conditions of the liquid in the above mentioned institutions. Options are presented to ensure that water quality is maintained in the different consumption centers and a predictable model is proposed that allows the maximum time that guarantees the minimum level of allowable residual chlorine that a consumer source should have. [ABSTRACT FROM AUTHOR]

Ecological trails are places that promote ecotourism, aiming to raise awareness about the preservation and conservation of natural resources. However, many trails have not been valued by environmental agencies or owners, depreciating their environmental function. Much of this is due to the lack of mapping and environmental characterization, also of its important natural resources such as bodies of water that can be used for drinking and/or bathing. In this sense, the aim of this study was to apply geoprocessing tools to the environmental characterization of a trail used by pilgrims in Delfim Moreira, southern Minas Gerais, and to evaluate five water points of interest to users regarding their potability (human consumption) and balneability (recreation), through microbiological analysis of total coliforms and Escherichia coli. The thematic maps generated were of location, vegetation, classification by the Normalized Difference Vegetation Index (NDVI), hypsometric and slope with longitudinal profile, soils, climate, hydrography and permanent preservation areas (PPA). The results of microbiological analysis showed that the waters of the springs that intersect the trail (points 3, 4 and 5) are contaminated with fecal coliforms (E. coli), being unsuitable for human consumption immediately. However, the water of the waterfall and river (points 1 and 2) showed excellent for recreational activities. The mapping and environmental characterization showed that it is a protected area trail, with easy access and low degree of physical effort by users, exuberant Atlantic Forest landscape, with strong tourist and economic appeal by environmental and tourism managers in the region. [ABSTRACT FROM AUTHOR]

Objective: The article aims to diagnose the water supply system of the municipality of Conceição das Pedras - State of Minas Gerais, from the evaluation of the user's perception, in order to evaluate the quality of the service provided. Methodology: The population's perception was raised through the application of a data collection form on the water supply system, containing 17 closed questions and 3 open questions. The form was applied via Google Forms in March 2022 and 108 responses were obtained. Relevance: The users' perception is essential for the management and planning of actions to meet the water supply. Still, the provision of public sanitation services, especially in municipalities operated by local institutions, needs research and greater attention. Main Results: Important information was collected, such as notes that water sometimes has color, taste and odor. There are also complaints of greasy water. From the users' perception, the system has a low number of interruptions in the water supply and a brief resolution of the issue. With this, it can be pointed out that, even with the water supply system presenting some possible problems, the majority of the population considers the water quality to be good or regular, which is extremely important for the population's quality of life. Contributions: We hope that the information gathered by this research can contribute to a better management of the city's water supply system, as well as the applied methodology can serve as a guide for other papers. [ABSTRACT FROM AUTHOR]

Objective. The study evaluated the performance and survival of Colossoma macropomum larvae at different temperatures and concentrations of prey. Materials and methods. Two temperatures (28 and 32°C) (T) and two initial daily concentrations (500 and 1,000 Artemia nauplii per larva) (CP) of prey were used. These concentrations were increased every 5 days during the first 15 days of cultivation. From the 16th to the 30th day, the larvae received exclusively a commercial diet. Results. In the first 7 days, weight (P), total length (TL) and daily specific growth rate (SGR) were higher for T32 treatments (p<0.05). After 15 days, P, TL and SGR were higher for CP1000 (p<0.05). After 22 days, P and TL suffered the effect of the initial concentration of prey and water temperature with higher values for CP1000 and T32 (p<0.05). At the end of 30 days of cultivation, P was affected only by water temperature with higher values for T32 (p<0.05). The TL showed an effect of temperature and initial concentration of prey with higher values for CP1000 and T32 (p<0.05). During feeding with a commercial diet (days 16-30 of cultivation), survival was higher for T32 (94.38±6.12%) (p<0.05), with no difference for initial prey concentration. Conclusions. It is concluded that the larviculture of C. macropomum must be carried out with a temperature of 32° C and that the food management must be differentiated during the first 15 days, positively influenced in the period of feeding with ration. [ABSTRACT FROM AUTHOR]

The management of water resources in community systems faces several challenges when it comes to meeting the population's water demand. The efficiency of the water service provided by the Drinking Water Administrative Boards (JAAP) of the province of Los Ríos was diagnosed, through the identification of compliance (C) and non-compliance (NC), interviews and perception surveys based on the indicators: continuity of service, satisfaction with water quality, presence/absence of diseases, and perception of the work carried out by the directors of the JAAP. SPSS Statistic software was used, "Cronbach's alpha" (degree of reliability) was applied, Principal Component Analysis (PCA), KMO test (Kaiser--Meyer--Olkin Measure) showed a variable ratio of (0.78). The commonality matrix indicated a correlation criterion greater than (0.7), while the total variance explained for the principal component analysis was (76.14%). The majority of users considered it to be an optimal service, although 17.64% considered the pressure with which the water resource is received to be limiting, associating the presence of impurities. [ABSTRACT FROM AUTHOR]

This article correlates the results of three studies carried out between 2019 and 2022, on the situation of women in the context of the palm oil industry, water quality, and the dynamics of expansion of oil palm cultivation, with the period 2010-2020, in seven municipalities of the Northern Lowlands of Guatemala (Ixcán, Sayaxché, Chisec, Raxruhá, Fray Bartolomé de las Casas, Panzós and El Estor). The results of these analyses allow the authors to draw some conclusions that corroborate the complaints of local communities regarding the socio-environmental impacts of this monocrop. The article concludes with the need for the Guatemalan State to exercise its role as guarantor of human and environmental rights. At the same time, the international community must advance in approving regulations that ensure that transnational corporations observe "due diligence" throughout supply chains. [ABSTRACT FROM AUTHOR]

Context: The intensifying utilization of glyphosate has provoked global scientific concern due to the potential large-scale impact on ecosystems. In 2015, the International Agency for Research on Cancer (IARC) reclassified glyphosate and its degradation byproduct, aminomethylphosphonic acid (AMPA), as Category 2A, indicating probable human carcinogenicity. Knowledge Gap: A review of the existing literature reveals a relative scarcity of information on the aquatic impact of glyphosate and its degradation products. Purpose: To determine the scope and implications of the impact of glyphosate and its degradation products on aquatic ecosystems, in order to better understand their ecotoxicological effects and provide a foundation for future research and policy decisions in this area. Methodology: A systematic review of ecotoxicological studies published in Spanish and English over the last 12 years was conducted to assess the effects of glyphosate and its degradation products on aquatic ecosystems and the risks to vari-ous species. Approximately 95 documents were reviewed, including data from 69, addressing toxicity, biodegradation, contamination, and international regulations. Results: Studies have shown that chronic exposure to glyphosate can alter the metabolism in fish and affect the life cycle of organisms such as Daphnia Magna. The composition of glyphosate, along with its adjuvants, can increase its toxicity and pose risks to the aquatic ecosystem, making it crucial to understand the specific formulations and their concentrations. Conclusions: The increased use of glyphosate raised global scientific concerns due to its potential impact on ecosystems, with the IARC classifying it as possibly carcinogenic to humans. Studies showed acute toxicity to aquatic organisms and highlighted the need for risk assessment methodologies for long-term impacts on ecosystems and human. [ABSTRACT FROM AUTHOR]

Resumen: Se evaluó la calidad del agua de los ríos de una subcuenca árida del norte de Argentina en un gradiente longitudinal, durante el período de sequía máxima de 2017. Se estudió la composición y estructura del fitobentos mediante índices bióticos. Se determinaron 126 spp. en total, con predominio de diatomeas y cianobacterias. La mayoría de las especies de diatomeas encontradas eran de meso a polihalobas y tolerantes a la contaminación orgánica. A pesar de que los ríos de la cuenca atraviesan zonas con usos de la tierra muy diferentes, no se registraron diferencias en las abundancias de fitobentos entre los sitios. Según el Índice de Saprobiedad de Pantle & Buck, la subcuenca se clasificó en el rango de α‐mesosaprobiedad, y el Índice de Eutrofización/Contaminación por Diatomeas asigna una calidad baja a la mayoría de los sitios. La salinidad debe inducir una homogeneización de la ficoflora que limita la sensibilidad de los índices bióticos a los impactos antropogénicos. [ABSTRACT FROM AUTHOR]

Copyright of Acta Universitaria is the property of Universidad de Guanajuato/Acta Universitaria and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Ciencia e Ingenieria Neogranadina is the property of Ciencia e Ingenieria Neogranadina and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Salud, Ciencia y Tecnología is the property of Fundacion Salud, Ciencia y Tecnologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Caldasia is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Risk, Hazards & Crisis in Public Policy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Foco (Interdisciplinary Studies Journal) is the property of Revista Foco and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

México cuenta con una gran variedad de lagos de diferentes características y de gran importancia tanto para aspectos biológicos como sociales. El presente trabajo muestra el desarrollo de un sistema computacional para el análisis de la calidad del agua en cuerpos lacustres mediante la medición de parámetros fisicoquímicos de relevancia, como son temperatura, turbiedad y niveles de oxígeno disuelto. A través del diseño y construcción de un sistema de medición sumergible se automatiza el proceso de análisis de calidad del agua. El desarrollo de un software especializado para la gestión y medición de los datos obtenidos permite agilizar el proceso de evaluaciones de calidad del agua. Asimismo, se definen modelos matemáticos para la estimación de los parámetros de la calidad del agua a diferentes profundidades. Las mediciones experimentales realizadas se llevaron a cabo en el Lago de Zirahuén, localizado en el estado de Michoacán de Ocampo, México, debido a la importancia para el ecosistema de la localidad y a la diversidad de especies endémicas que habitan en él. Como resultado se obtiene una herramienta para facilitar la toma de decisiones con el propósito de conservar los cuerpos de agua, permitiendo realizar análisis más avanzados.

En Guatemala, el método de desinfección más económico para el tratamiento de aguas residuales es la cloración, generando trihalometanos (THM) como principal contaminante. Este estudio evaluó los niveles de trihalomentanos totales (TTHM) en plantas de tratamiento de agua residual (PTAR) aerobias y anaerobias que utilizan cloración. Se empleó el método HACH 10132 para análisis, diseñado para agua potable adaptado a aguas residuales domésticas. Se tomaron muestras de seis PTAR en cinco zonas de la ciudad de Guatemala. De las 30 muestras analizadas, el 83% superó los límites de TTHM establecidos por la USEPA (80 µg/l). Los resultados de cloro residual indicaron que el tricloro fue la fuente predominante de TTHM. Se identificaron correlaciones significativas (coeficiente > 0.6) entre el tricloro y parámetros como DBO5, sólidos suspendidos y turbiedad en el 50% de las variables estudiadas. Estas asociaciones sugieren la influencia de la materia orgánica en la formación de TTHM. Este estudio destaca la necesidad de reconsiderar la eficacia y sostenibilidad de la cloración en el tratamiento de aguas residuales, así como la importancia de monitorear y controlar los niveles de TTHM para garantizar la calidad ambiental y la salud pública.

En Cuba la Oficina Nacional de Normalización estableció un procedimiento de cálculo para la delimitación de las zonas de protección sanitarias (ZPS), vigente en la NC 1192: 2017. Además de este procedimiento, existen modelos matemáticos que son aplicados en todo el mundo como es el caso del modelo matemático utilizando el programa WhAEM. Estos dos métodos fueron aplicados en cuatro de las fuentes de abasto de San José de las Lajas. Arrojando como resultado que los dos métodos presentan resultados favorables, con una relación entre ellos de un 99% de precisión, por lo que se justifica la utilización del programa WhAEM, en las zonas donde no se cuente con todos los datos hidrogeológicos necesarios para la utilización de la NC 1192: 2017. Lo cual garantiza que todos los pozos de abasto cuenten con la determinación de ZPS.

Copyright of Revista Foco (Interdisciplinary Studies Journal) is the property of Revista Foco and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)