Further development of small hydropower facilities will significantly reduce sediment transport to the Pantanal wetland of Brazil

Small hydropower (SHP) facilities, which are defined by installed capacities 20% net retention of suspended sediments, two others retained between 10 and 20%, seven were within 10%, and six showed >10% net release. Bedload sediment transport was a small component of total sediment transport in rivers with high total sediment loads. Multiyear series of satellite images confirm sediment accumulation in several cases. Model predictions of the impacts of future hydropower facilities on suspended sediment concentrations and transport show retention of a large fraction (often much >20%) of sediment inputs. Summing riverine transport rates for inflows into the Pantanal indicates that currently envisioned future hydropower development would reduce the suspended sediment transport by ∼62% from the current rate. This study shows that if SHPs are built on sediment-rich rivers, this may prove problematic for the facilities as well as for downstream ecosystems. These results support recommendations that several river systems presently lacking dams in their lower reaches should be excluded from future hydropower development to maintain the sediment supply to the Pantanal

Simulating land use changes, sediment yields, and pesticide use in the Upper Paraguay River Basin: Implications for conservation of the Pantanal wetland

As a consequence of accelerated and excessive use of pesticides in tropical regions, wilderness areas are under threat; this includes the Pantanal wetlands in the Upper Paraguay River Basin (UPRB). Using a Land Cover Land Use Change (LCLUC) modelling approach, we estimated the expected pesticide load in the Pantanal and the surrounding highlands region for 2050 under three potential scenarios: i) business as usual (BAU), ii) acceleration of anthropogenic changes (ACC), and iii) use of buffer zones around protected areas (BPA). The quantity of pesticides used in the UPRB is predicted to vary depending on the scenario, from an overall increase by as much as 7.4% in the UPRB in the BAU scenario (increasing by 38.5% in the floodplain and 6.6% in the highlands), to an increase of 11.2% in the UPRB (over current use) under the AAC scenario (increasing by 53.8% in the floodplain and 7.5% in the highlands). Much higher usage of pesticides is predicted in sub-basins with greater agricultural areas within major hydrographic basins. Changing the current trajectory of land management in the UPRB is a complex challenge. It will require a substantial shift from current practices, and will involve the implementation of a number of strategies, ranging from the development of new technologies to achieve changes in land use policies, to increasing dialogue between farmers, ranchers, the scientific community, and local or traditional communities through participatory learning processes and outreach

Health risk behavior of Brazilian university men

The insertion of men in the university environment is a complex and worrying phenomenon permeated by vulnerabilities, which are associated with the adoption of risky behaviors for health. The objective of this study was to evaluate the health behavior of Brazilian university men. A cross-sectional study with 663 men students. The study used a questionnaire on health-related life habits. All the questions were extracted from the Surveillance of Risk and Protection Factors for Chronic Diseases through Telephone Interviews. Logistic regression was used to estimate odds ratios (OR) and 95% confidence intervals and chi-square tests. The analysis of the joint relationships between nutritional status, physical activity and diet was conducted by the multiple correspondence analysis. Of the 663 students, 67.8% were between 20-29 years of age, 69.2% consumed alcohol, 34.5% did not do physical activity, and 34.2% were overweight. The students who did not engage in physical activity smoked more (p=0.05), consumed less fruit (p<0.01), less salad (p<0.01), and consumed full fat milk (p=0.05). In the physically inactive students, a high prevalence of acquiring diabetes mellitus (p<0.01) and high cholesterol (p<0.01) was observed. University students were found to have unhealthy lifestyles. More public policies aimed at promoting preventive measures at universities are needed to encourage healthier health behaviors.La inserción de los varones en el ámbito universitario es un fenómeno complejo y preocupante permeado por vulnerabilidades, las cuales están asociadas a la adopción de conductas de riesgo para la salud. El objetivo del trabajo fue evaluar el comportamiento de salud de los varones universitarios brasileños. Estudio transversal con 663 varones. El estudio utilizó un cuestionario sobre hábitos de vida relacionados con la salud. Todas las preguntas fueron extraídas de la Vigilancia de Factores de Riesgo y Protección de Enfermedades Crónicas mediante entrevistas telefónicas (Vigitel). Se utilizó la regresión logística para estimar los odds ratios (OR) y los intervalos de confianza del 95% and pruebas del test chi-cuadrado. El análisis de las relaciones conjuntas entre estado nutricional, actividad física y dieta se realizó mediante el análisis de correspondencias múltiples. De los 663 varones, el 67,8% tenía entre 20 y 29 años, el 69,2% consumía alcohol, el 34,5% no hacía actividad física y el 34,2% tenía sobrepeso. Los varones que no realizaron actividad física fumaron más (p = 0,05), consumieron menos fruta (p<0,01), menos ensalada (p<0,01) y consumieron leche entera (p = 0,05). En los varones físicamente inactivos, se observó una alta prevalencia de diabetes mellitus (p<0,01) y colesterol alto (p<0,01). Se descubrió que los varones universitarios tenían estilos de vida poco saludables. Se necesitan más políticas públicas orientadas a promover medidas preventivas en las universidades para fomentar comportamientos de salud más saludables

Further development of small hydropower facilities will significantly reduce sediment transport to the Pantanal wetland of Brazil

Small hydropower (SHP) facilities, which are defined by installed capacities 20% net retention of suspended sediments, two others retained between 10 and 20%, seven were within 10%, and six showed >10% net release. Bedload sediment transport was a small component of total sediment transport in rivers with high total sediment loads. Multiyear series of satellite images confirm sediment accumulation in several cases. Model predictions of the impacts of future hydropower facilities on suspended sediment concentrations and transport show retention of a large fraction (often much >20%) of sediment inputs. Summing riverine transport rates for inflows into the Pantanal indicates that currently envisioned future hydropower development would reduce the suspended sediment transport by ∼62% from the current rate. This study shows that if SHPs are built on sediment-rich rivers, this may prove problematic for the facilities as well as for downstream ecosystems. These results support recommendations that several river systems presently lacking dams in their lower reaches should be excluded from future hydropower development to maintain the sediment supply to the Pantanal

The end of an entire biome? World's largest wetland, the Pantanal, is menaced by the Hidrovia project which is uncertain to sustainably support large-scale navigation

The resurgent navigation project known as the Hidrovia Paraguay-Paraná threatens the integrity of the Pantanal, the world's largest wetland, which is considered a biome of its own. Intensive barge navigation is intended to transport crops (soybean, sugar, corn) and cement, iron and manganese from areas of production in Brazil, Paraguay and Bolivia to the oceanic ports of the Plata River. This short communication assembles the information available on the potential impacts of the planned deepening of the natural channel of the Paraguay River in its ~700 km-long upper section. These river channel alterations would disconnect the river from its floodplain, shorten the inundation period, and shrink the wetland area, resulting in severe degradation of the globally outstanding biological and cultural diversity of the Pantanal. The river sediments are mostly sandy and would require perpetual dredging. The reaches needing the most intensive dredging are those of the highest ecological value, protected as a National Park, UNESCO World Heritage and Biosphere Reserves, and various Indigenous reserves and Ramsar sites. Climate change is projected to increase the occurrence of low water periods. Between 2019 and 2021, navigation was impossible even in the already-deepened reaches of the Paraguay River between Corumbá and Asuncion during long periods of the year. Thus, despite considerable financial and technical efforts, the success of the navigation project is doubtful, whereas enormous environmental, cultural, and social impacts can be anticipated. For these reasons, the Brazilian government had already turned down the project in 2000. We suggest alternative, less impactful modes of transport of commodities, e.g., via railway