Evaluating pollution-related damage and restoration success in urban forests with participatory monitoring and digital tools

Peri-urban forest monitoring requires indicators of vegetation damage. An example is the sacred fir (Abies religiosa) forests surrounding Mexico City, which have been heavily exposed to tropospheric ozone, a harmful pollutant, for over 4 decades. We developed a participatory monitoring system with which local community members and scientists generated data on ozone tree damage. Santa Rosa Xochiac rangers (13) used the digital tool KoboToolBox to record ozone damage to trees, tree height, tree ages, tree condition, tree position, and whether the tree had been planted. Thirty-five percent of the trees (n = 1765) had ozone damage. Younger trees had a lower percentage of foliage damaged by ozone than older trees (p < 0.0001), and asymptomatic trees tended to be younger (p < 0.0001). Symptomatic trees were taller than asymptomatic trees of the same age (R²_c = 0.43, R²_m = 0.27). Involving local communities facilitated forest monitoring and using digital technology improved data quality. This participatory system can be used to monitor forest condition change over time and thus aids restoration efforts driven by government or local communities’ interests, facilitating local decision-making.     

Source-term development for a contaminant plume for use by multimedia risk assessment models

Multimedia modelers from the US Environmental Protection Agency (EPA) and US Department of Energy (DOE) are collaborating to conduct a comprehensive and quantitative benchmarking analysis of four intermedia models: MEPAS, MMSOILS, PRESTO, and RESRAD. These models represent typical analytically based tools that are used in human-risk and endangerment assessments at installations containing radioactive and hazardous contaminants. The objective is to demonstrate an approach for developing an adequate source term by simplifying an existing, real-world, ⁹⁰Sr plume at DOE's Hanford installation in Richland, WA, for use in a multimedia benchmarking exercise between MEPAS, MMSOILS, PRESTO, and RESRAD. Source characteristics and a release mechanism are developed and described; also described is a typical process and procedure that an analyst would follow in developing a source term for using this class of analytical tool in a preliminary assessment.     

“We are free when water is available”: gendered livelihood implications of sporadic water supply in Northern Ghana

ABSTRACT

Water shortages may present different and diverse implications for gender subgroups particularly in low-income settings. Yet, little research has documented the gendered livelihood implications of water shortages in Ghana. Based on a cross-sectional mixed method research involving a survey of 250 household heads and complemented with a qualitative study of 86 participants, the paper examines the differential effects of sporadic water supply in Tatale-Sanguli District of Northern Ghana. Our findings suggest that the livelihood effects of sporadic water supply in Tatale-Sanguli area are gendered, with females being disproportionately affected as compared to males. These differential effects are often framed by both gender role differentiation and inequities in access to vital productive resources and critical assets such as bicycles, tricycles and motor bikes. These findings highlight not only the need for local government and non-governmental organisations to step up efforts in water provision, but also to recognise the gendered effects of water shortages in Tatale-Sanguli District. Key to policy is also to ensure that programmatic interventions during water shortages take account of the likely gendered effects and differentiated burdens.     

Human health and sustainable water resources development in Nigeria: Schistosomiasis inartificial lakes

In the last three decades, there has been an unprecedented upsurge in dam construction in Nigeria to store water for year-round water supply, irrigation and fisheries. Out of a total of 323 dams identified in the literature, 246 (76.2%) were constructed since 1970. Although only 47 of the reservoir lakes have been surveyed for snail intermediate hosts and 11 of the 47 for human infection, the results obtained by the various workers are very revealing. Snail hosts of schistosomiasis were found in 20 (42.6%) of the 47 lakes and human infection in 10 (90.9%) of the 11 lakes investigated for the respective purposes. These findings show that dam construction is contributing to schistosomiasis transmission in Nigeria and, unless urgent steps are taken to reverse the situation, the adverse health consequences of the dams will more than balance their socio-economic benefits. This paper discusses these problems in the context of existing institutional and legal frameworks in Nigeria and identifies appropriate measures, that could achieve sustainable water resources development in the future.     

Development of termites severity probability map of futa campus area using geographical information system (GIS) technology

Environment, Development and Sustainability - Siting of buildings in rural urban development requires that the prevalence of termite activities is considered. The severity of termite activities...     

Differential use of conspecific-derived information by sexual and asexual parasitic wasps exploiting partially depleted host patches

When foraging partially depleted patches (i.e., a fraction of hosts are already parasitized), female parasitoids must decide: 1—whether to superparasitize, and 2—whether to stay in their current patch (thus missing the opportunity of finding a better patch elsewhere). To make these decisions, parasitoids may rely on different cues, produced both by the environment and by conspecifics. Animals thriving in different environments may differ in cues they use. In the solitary parasitoid Venturia canescens, thelytokous (asexual) and arrhenotokous (sexual) individuals are found in two contrasting environments. Thelytokous females, from anthropogenic conditions, are known to cope with superparasitism in an adaptive way. On the other hand, little is known about superparasitism by arrhenotokous females. We compared the host exploitation strategies of thelytokous and arrhenotokous females in partially depleted patches. Hosts parasitized by thelytokous females were more frequently avoided than those parasitized by arrhenotokous females, suggesting a stronger chemical marking of the former. Only thelytokous females used information from conspecifics for patch-leaving decisions. The conformity of the differences in the behavior of thelytokous and arrhenotokous females with the environmental conditions they experience in their habitat is discussed.     

Analysis of the transitions between flow patterns in open-channel lateral cavities with increasing aspect ratio

Environmental Fluid Mechanics - The flow pattern within a storage zone governs the efficiency of passive scalar accumulation, spreading and homogenization. The present paper aims at characterizing...     

Geochemical provenance and spatial distribution of fluoride in groundwater of Mayo Tsanaga River Basin, Far North Region, Cameroon: implications for incidence of fluorosis and optimal consumption dose

The 500,000 inhabitants of Mayo Tsanaga River Basin are vulnerable to a “silent” fluorosis from groundwater consumption. For the first time, the groundwater is investigated for the purpose of identifying the provenance of fluoride and estimating an optimal dose of fluoride in the study area. Based on the fluoride content of groundwater, fluorine and major oxides abundances in rocks from the study area, mean annual atmospheric temperature, and on-site diagnosis of fluorosis in children, the following results and conclusions are obtained: Fluoride concentration in groundwater ranges from 0.19 to 15.2 mg/l. Samples with fluoride content of <1.5 mg/l show Ca–HCO₃ signatures, while those with fluoride >1.5 mg/l show a tendency towards Na-HCO₃ type. Fluor-apatite and micas in the granites were identified as the main provenance of fluoride in the groundwater through water-rock interactions in an alkaline medium. The optimal fluoride dose in drinking water of the study area should be 0.7 mg/l, and could be adjusted downward to a level of 0.6 mg/l due to the high consumption rate of groundwater, especially during drier periods.