Peri-urban Locations Research Articles

Detection of Beta-Lactam-Resistant Escherichia coli and Toxigenic Clostridioides difficile Strains in Wild Boars Foraging in an Anthropization Gradient.

Simple SummaryThe wild boar (Sus scrofa) has been identified as a reservoir of zoonoses and food-borne pathogens. Wild boar populations are growing worldwide, also near urban centers such as Barcelona (Catalonia, Spain). The aim of this study was to assess the presence of zoonotic agents in the wild boar populations from the Metropolitan Area of Barcelona (MAB). The detection of Escherichia coli carrying critical antimicrobial resistance genes to β-lactams and, for the first time in Spain, the detection of toxigenic Clostridioides difficile strains in wild boars foraging in urban areas show the value of this game species as a sentinel of antimicrobial-resistant bacteria (AMRB) and zoonotic agents in the environment. Moreover, the wild boars foraging in urban and peri-urban locations were more exposed to AMRB sources than the wild boars dwelling in natural environments. The responsible health agencies should undertake specific actions to fully assess the potential implications for the human population and/or environmental health. Zoonotic diseases and hazards beyond the compulsory surveillance diseases should be specifically targeted in the growing human–wildlife interface of urban environments such as the MAB under the One Health approach.Disease transmission among wild boars, domestic animals and humans is a public health concern, especially in areas with high wild boar densities. In this study, fecal samples of wild boars (n = 200) from different locations of the Metropolitan Area of Barcelona were analyzed by PCR to explore the frequency of β-lactamases and extended cephalosporin and carbapenem resistance genes (ESBLs) in Escherichia coli strains and the presence of toxigenic Clostridioides difficile. The prevalence of genes conferring resistance to β-lactam antimicrobials was 8.0% (16/200): blaCMY-2 (3.0%), blaTEM-1b (2.5%), blaCTX-M-14 (1.0%), blaSHV-28 (1.0%), blaCTX-M-15 (0.5%) and blaCMY-1 (0.5%). Clostridioides difficile TcdA+ was detected in two wild boars (1.0%), which is the first report of this pathogen in wild boars in Spain. Moreover, the wild boars foraging in urban and peri-urban locations were more exposed to AMRB sources than the wild boars dwelling in natural environments. In conclusion, the detection of E. coli carrying ESBL/AmpC genes and toxigenic C. difficile in wild boars foraging in urban areas reinforces the value of this game species as a sentinel of environmental AMRB sources. In addition, these wild boars can be a public and environmental health concern by disseminating AMRB and other zoonotic agents. Although this study provides the first hints of the potential anthropogenic sources of AMR, further efforts should be conducted to identify and control them.

Dogs as Sentinels for Flavivirus Exposure in Urban, Peri-Urban and Rural Hanoi, Vietnam.

Diseases caused by flaviviruses, including dengue fever and Japanese encephalitis, are major health problems in Vietnam. This cross-sectional study explored the feasibility of domestic dogs as sentinels to better understand risks of mosquito-borne diseases in Hanoi city. A total of 475 dogs serum samples from 221 households in six districts of Hanoi were analyzed by a competitive enzyme-linked immunosorbent assay (cELISA) for antibodies to the pr-E protein of West Nile virus and other flaviviruses due to cross-reactivity. The overall flavivirus seroprevalence in the dog population was 70.7% (95% CI = 66.4–74.8%). At the animal level, significant associations between seropositive dogs and district location, age, breed and keeping practice were determined. At the household level, the major risk factors were rural and peri-urban locations, presence of pigs, coil burning and households without mosquito-borne disease experience (p < 0.05). Mosquito control by using larvicides or electric traps could lower seropositivity, but other measures did not contribute to significant risk mitigation of flavivirus exposure in dogs. These results will support better control of mosquito-borne diseases in Hanoi, and they indicate that dogs can be used as sentinels for flavivirus exposure.

Effect of Modified Septic Tank on Groundwater Quality around Federal University of Agriculture, Abeokuta, South-west Nigeria

Groundwater forms a very important part of the water supply chain and its quality can be affected by improperly constructed septic tanks used by homeowners in peri-urban locations such as Abeokuta in recent times. Sixty groundwater samples collected from hand-dug wells ≤15m from septic tanks were analysed for physicochemical and bacteriological parameters using standard procedures. Results were integrated with multivariate and hydrogeochemical analyses to assess the effect improperly built septic tanks have on groundwater quality around the Federal University of Agriculture, Abeokuta. The range of values for the measured parameters include: pH (6.26 – 8.66), EC (83 – 1035 μS cm-1), TDS (42 – 621 mg L-1), Mg2+ (2 – 60 mg L-1), NO3- (5.09 – 17 mg L-1), Fe (-.04 – 5.32 mg L-1), BOD (0.1 – 13.2) and E. Coli (ND – 41×10 cfu mL-1). The abundance of major ions are in the order Ca2+˃Mg2+˃K+˃ Na+ and Cl- ˃SO42- &gt;HCO3- &gt;NO3- ˃PO42-. The piper trilinear plot shows that the dominant hydrochemical facies in the study area is the Ca2+–Cl- type. A correlation analysis and a principal component analysis both reflect intrusions from biological wastes such as surrounding septic tanks or municipal waste disposals as well as dissolutions from basal rocks. The possibility of infiltration from sewage into groundwater is confirmed by the number of samples with high BOD, NO3-, and E. coli concentrations. Contamination of groundwater with sewage exposes the populace to acute excreta-related illness. This therefore calls for stringent monitoring and management measures to be put in place by relevant regulatory authorities to safeguard the human health and environment within the study area.

New Dimensions of Vulnerability to Energy and Transport Poverty

As we decarbonise societies, we need to consider how such transitions interconnect energy and transport systems. In this Commentary, we argue that we need a better understanding of who may be vulnerable in low-carbon transitions. Current energy poverty definitions and metrics focus overwhelmingly on energy service consumption within the home, yet similar issues in the transport sector are often neglected. Failure to account for the intersections between energy and transport poverty may deepen structural forms of deprivation and worsen social and material inequalities, therefore preventing equitable transitions.

Refugee entrepreneurship and self-reliance: the UNHCR and sustainability in post-conflict Sierra Leone

AbstractEntrepreneurship has been advocated as a path to self-reliance for refugees, but little scholarship has been produced about refugee entrepreneurs operating in their country of origin during reintegration. In 2003–04, the United Nations High Commissioner for Refugees (UNHCR) implemented a group of ‘entrepreneurial ventures’ in urban and peri-urban locations in Kambia, Sierra Leone. Fifteen years later, 20 per cent of these ventures were still operating—a figure comparable with the success of start-ups in the United States. This paper examines the reasons for the sustainability of some ventures and the limited lifespan of others, using five interrelated metrics: ownership, management, mission and activities, financing and physical capital. It will be argued that, in the start-up phase, the UNHCR had a positive impact on the formation of entrepreneurial ventures by negotiating rules about property rights and credit, and by adopting a bottom-up approach to promote innovation among returnees. In the transition phase, however, the UNHCR’s planned handover to other UN agencies as part of the 4 R’s process largely failed because of inadequate attention to transition funding. In the mature phase, refugee enterprises survived if they could secure property rights to their facilities and adapt their management structures, activities and financing, while still preserving their social missions.

Smartphone Usage in the Greater Accra Region of Ghana: What are the Critical Drivers?

Smartphone usage has increased significantly in recent times across rural, peri-urban and urban locations. However, the key underlying factors that drive the increased demand and usage are unclear. This study analyses the factors that influence people’s choice for smartphones across different geographical settings in the Greater Accra Region of Ghana, using a sample of 305 respondents. Data was collected using programmable tablets through a case study survey that sampled individuals across different locations randomly. By employing probit regression analysis, the study established that geographical location matters in the choice of smartphone usage. Urban and peri-urban locations significantly influence smartphone use while rural location was found to be insignificant. Education, age, access to mobile applications and access to mobile money services are positive and significant drivers of smartphone usage. Besides, the number of registered Subscriber Identity Module (SIM) cards used and affordability, negatively and significantly impacts on smartphone use. These findings are relevant to electronic consumers and companies, regulators and policymakers.

Spatial Analysis of Human Settlement Expansion Rate in Nigeria: A Case Study of Akure Per-Urban Locations

The purpose of this research is to study the rate of horizontal expansion of human settlement in Akure from 2007 to 2018 with focus on three peri-urban locations that has experienced massive growth in most recent times. Efforts were made to make predictions of possible expansion for the next 20 to 32 years in these areas. To achieve the objectives of this research Google earth images were obtained for all three selected locations for the years 2007 and 2018. For the three locations the same square area was maked out for analysis. The area covered by human settlement for the years 2007 and 2018 was obtained for all three locations using the polygon tool on Google earth. Futher mathematical calculations were done to help determine the rate of horivontal settlements between the two time periods. Calculations were also done to predict the rate of future expansion in all three locations. The results shows that built up area in the three selected locations is rapidly expanding, as a result large vegetation are lost. Predictions show that Akure is tending towards a fully developed conurbation. It concludes by affirming that there is a need to adopt the use of sustainable high-rise mixed-use buildings as a better approach to the current trend of human settlement in Nigeria based on low-rise structures and continuous deforestation to make rooms for new settlements.

Biomonitoring by epiphytic lichen species-Pyxine cocoes (Sw.) Nyl.: understanding characteristics of trace metal in ambient air of different landuses in mid-Brahmaputra Valley.

This study presents a comparative assessment of the trace metal air pollutants of urban, peri-urban, and rural areas of the Brahmaputra Valley plain in the Eastern Himalayan region using biomonitoring of Pyxine cocoes. In situ collection of the thalli growing on Bombax sp. from representative locations was done, which was analyzed for Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn using ICP-OES. The metals, viz. Cd, Cr, Ni, Pb, and Zn, were highly enriched, indicating anthropogenic influences. The coefficients of variation (CV) of Co, Cr, and Ni were also high, pointing at their accumulation from local sources. Influence of local sources was also observed for Cd, Fe, and Mn in peri-urban and Cd in urban samples. Metals related to automobiles were accumulated in greater volume in samples of peri-urban locations, which implies the impact of the highway that runs through these locations and other associated human activities. The samples of urban areas were found to be enriched with metals originating from both vehicular emissions and road dust. Also, accumulations of Co, Cr, Cu, Fe, Mn, and Ni in the lichen thalli were found to be around tea gardens. Inter-species correlations were found to be positively significant for most of the elements. Principal component analysis (PCA) of the metal data revealed that vehicular emission and coal burning, street dust, and crustal dust were the major sources of trace metals in the ambient air of the region.

Integrating Teaching and Learning with Inter-Disciplinary Action Research in Support of Climate Resilient Urban Development

The capital cities of the South Pacific are experiencing rapid urbanisation pressures as increasing numbers of people migrate to the primary cities either in search of employment and greater access to healthcare and education, or as a consequence of environmental ‘push’ factors. However, the limited capacity of municipal Governments to respond to the scale and pace of change is leading to a growth of informal settlements in peri-urban locations. Factors of exposure, sensitivity, and adaptive capacity combine to make these informal settlements the most vulnerable areas to natural hazards. In response to this critical urban resilience agenda, this paper looks at how participatory action research is providing inter-disciplinary scientific support for the implementation of urban resilience and climate actions in Honiara, Solomon Islands. Adaptation measures involve a combination of hard and soft actions; as well as activities designed to strengthen local capacity to respond to contemporary resilience challenges. Addressing the adaptive capacity component, this paper also highlights the opportunities for Australian universities to integrate teaching and learning with action research to achieve a substantive real-world impact in the Pacific region, as well as illustrating the capacity strengthening benefits that can be achieved through sustained engagement and collaborative partnerships with local organisations.

Groundwater Policy and Ground Water Dependencies: Reflecting on the Evolving Socio-Environmental Dynamics in Peri-Urban Kathmandu Valley

Groundwater is an increasingly important source of water supply in Kathmandu Valley, ‘the hub of Nepal’s urbanisation’. Past studies have revealed that groundwater extraction in Kathmandu Valley exceeds its recharge, thus having negative consequences like drying of traditional water sources, decreasing yield of wells, and declining groundwater levels. The groundwater policy 2012 was formulated with the aim of managing groundwater use in the valley. Yet, with rapid urban growth, groundwater exploitation has continued increasing in the city and the peri-urban areas in Kathmandu Valley. But little is known regarding how urbanisation shapes increasing groundwater exploitation in the peri-urban settings. This study unfolds the underexplored socio-environmental dynamics underlying groundwater exploitation in peri-urban areas of Kathmandu Valley. The findings from the case study using qualitative research methods, conducted in peri-urban locations of Kathmandu Valley show increasing competition for water and growing use of as well as dependence on groundwater in these rapidly evolving peri-urban spaces, despite growing protests and worries about its consequences. However, the existing groundwater policy lacks attention to peri-urban dynamics of change and growth and does little to address the increasing groundwater use in peri-urban locations in the valley. The polarised views and local conflicts around groundwater exploitation emerging in peri-urban spaces are the outcome of multiple entanglements: sectoral divides and overlapping responsibilities in water institutions, weak governance and management; socio-economic transformations in peri-urban spaces, the invisibility of groundwater and ambiguity in the hydrological dynamics of conjunctive water use. Based on my findings, I stress on the need for addressing the existing macro-micro gaps (ground)water management by improving the understanding of local hydro-geological complexities and paying critical attention to the socio-economic, political and institutional drivers of increasing groundwater use.

Evidence from Measuring Community Flood Resilience in Asia

Disaster risk and subsequent loss and damage in Asia are increasing at an alarming rate, threatening socioeconomic gains. Arresting this rapid increase in exposure requires risk-informed development and urban planning—a challenging proposition complicated by multiple economic and political incentives. To reduce these risks, action at the national and regional levels must be complemented by action at the community level. Measuring community disaster resilience can help lead to novel and systemic investments that build community resilience. Our analysis of community flood resilience data finds deficiencies and potential for substantial improvements in community flood resilience investment across the region, with different recommendations for urban, peri-urban, and rural locations. Our evidence from case studies shows that interventions prioritized by the measurement-informed process are more likely to succeed and be sustainable and have cobenefits for community development.

Community-led housing and urban livelihoods: Measuring employment in low-income housing delivery

This paper explores a significant gap in knowledge about the employment impacts of community-led, low-income housing production, and the complex intersections between rights to housing, rights to work, and international attempts to define these rights, such as the ILO's ‘decent work’ agenda. We develop a four-way classification to understanding the livelihoods impact of housing interventions and how to measure it and, using evidence from construction workers and beneficiaries of the low-income housing developments supported by CLIFF (the Community Led Infrastructure Finance Facility) in Nairobi, this paper moves towards contextually-relevant definitions of ‘a job’. We argue that existing employment multipliers used by evaluation agencies underestimate livelihood needs, and that the ILO's ‘decent work’ agenda should be contextually reviewed, particularly for informal economy workers with multiple livelihood streams, where sustainability may be more important than formalised work. We suggest that ‘rights to housing’ and ‘rights to work’ may conflict, particularly where in-situ upgrading is not feasible and developing housing in peri-urban locations is necessitated by the contextual realities of fast-growing cities.

Assessment of potentially toxic elements in vegetables cultivated in urban and peri-urban sites in the Kurdistan region of Iraq and implications for human health.

Vegetable fields in and around urban areas in the Kurdistan region of Iraq may have higher than background concentrations of potentially toxic elements (PTEs) from contamination sources including municipal waste disposal and wastewater used for irrigation. The purpose of this study was to assess PTE concentrations in soils and the edible parts of field-grown vegetables to quantify potential health risks to the local population. In this survey, 174 soils and 26 different vegetable and fruit types were sampled from 15 areas around Sulaymaniyah and Halabja cities. Sampling was undertaken from fields in urban, peri-urban and rural locations including sites close to areas of waste disposal. The soils are calcareous (pH 7.67-8.21) and classified as silty loam, sandy or silty clay with organic matter content between 6.62 and 11.4%. Concentrations of PTEs were typically higher in waste disposal areas compared with urban, peri-urban and rural areas. Pollution load indices suggested that agricultural soils near waste disposal sites were contaminated with some trace elements. Potentially toxic element concentrations in vegetables were highly variable. Higher total concentrations of PTEs were measured in vegetables from the waste areas with decreasing concentrations in urban, peri-urban and rural areas. Risks to human health were assessed using hazard quotients (HQ). Vegetable consumption poses no risk for adults, whereas children might be exposed to Ni, As and Cd. Although HQs suggest elevated risk for children from consumption of some vegetables, these risks are likely to be lower when realistic dietary consumption levels are considered.

Facilitating Circular Economy in Urban Planning

A shift towards a more Circular Economy is crucial to achieve a more sustainable and inclusive built environment that meets future demands. Circular Economy is a promising concept for industry and society. If implemented well, Circular Economy can deliver environmental benefits and economic advantages for which innovation is essential. To achieve a resource-efficient built environment the Circular Economy should be developed and implemented systemically and on a large scale, going beyond cities. To realise this, local authorities, citizens, and other stakeholders need a collaborative and science-informed decision environment that allows for developing different waste and resource management options, and assessing their impacts on the environment, resilience, spatial quality and quality of life. The articles in this special issue all discuss different aspects of research to deliver solutions and strategies for a circular economy in urban planning throughout Europe, focusing on peri-urban locations. The first rticle introduces Living Labs as a methodology to co-create circular solutions and strategies with local stakeholders. The second article focuses on governance for the shift towards a Circular Economy, unravelling hindrances and revealing objectives, whereas the third article develops a means to transfer circular strategies and solutions from one location to another. The fourth article presents an open-source tool based on the geodesign approach which links the co-creation of design proposals to impact simulations informed by geographic contexts, systems thinking, and digital technology—the Geodesign Decision Support Environment. Finally, the fifth article presents the first results of incorporating the concept of Circular Economy in an integrative manner in urban design and planning courses.

EPIDEMIOLOGY OF CHLAMYDIA-INDUCED REPRODUCTIVE DISEASE IN MALE KOALAS (PHASCOLARCTOS CINEREUS) FROM SOUTHEAST QUEENSLAND, AUSTRALIA AS ASSESSED FROM PENILE URETHRAL SWABS AND SEMEN

Declining population sizes of koalas (Phascolarctos cinereus) in SE Queensland (QLD), Australia can partially be attributed to chlamydiosis, with the majority of epidemiological studies focusing on the prevalence of infection and associated pathology in female koalas, with lesser attention given to males. We aimed to explore the epidemiology of Chlamydia pecorum infection in the male urogenital tract from wild (hospitalized and free-ranging) koalas in SE QLD. Although 67% of male koalas were infected with C. pecorum in their urogenital tract and 55% were shedding the organism in their semen, only a third of the males sampled presented with overt signs of urogenital disease. Infection with C. pecorum was lower in populations from rural locations, compared with periurban locations, with a corresponding low association between urogenital infection and clinical disease. The presence of C. pecorum in penile urethral swabs was a good predictor of the presence of C. pecorum in semen, with a significant correlation (P=0.006) in 58% of males. In contrast, the C. pecorum load in penile urethral swabs was not a good predictor of the C. pecorum load in semen, with no significant correlation. In addition, 57% of male koalas had large numbers of bacterial copy numbers in the penile urethra (upper quartile) and 40% shedding into semen with no overt signs of disease. Investigation of the association of C. pecorum infection, body condition score, and age revealed that the highest incidence of urogenital infection occurred in males with the lowest body score (1 out of 10). Furthermore, 63% of sexually mature male koalas (>2 yr old) had urethral infections and 50% had C. pecorum in their semen. Our study suggested that the role of chlamydia in male koala infertility has been previously underestimated.

Prevalence of Leptospira Infection in Rodents from Bangladesh.

Worldwide, Leptospira infection poses an increasing public health problem. In 2008, leptospirosis was recognised as a re-emerging zoonosis of global importance with South-East Asia being one of the most significant centres of the disease. Rodents are thought to be the most important host for a variety of Leptospira serovars. Because Bangladesh offers a suitable humid climate for the survival of these pathogenic bacteria, the presence of rodents could be a serious risk for human infection, especially in peri-urban areas or locations where food is stored. In order to gain more understanding of the multi-host epidemiology, a prevalence study was conducted in Comilla, Bangladesh to determine the presence of pathogenic Leptospira species in rodents. Real-time Polymerase Chain Reaction (qPCR) and sequencing showed that 13.1% (61/465) of the trapped rodents were infected with pathogenic Leptospira. Sequencing of the qPCR products identified the presence of three species: Leptospira interrogans, Leptospira borgpetersenii, and Leptospira kirschneri. Rodents of the genus, Bandicota, were significantly more likely to be positive than those of the genus, Rattus and Mus. Our results confirm the importance of rodents as hosts of pathogenic Leptospira and indicate that human exposure to pathogenic Leptospira may be considerable, also in places where food (rice) is stored for longer times. This study emphasizes the need to improve rodent management at such locations and to further quantify the public health impacts of this neglected emerging zoonosis in Bangladesh.

Dengue in Fiji: epidemiology of the 2014 DENV-3 outbreak.

IntroductionDengue virus serotype-3 caused a large community-level outbreak in Fiji in 2013 and 2014. We aimed to characterize the demographic features of affected individuals and to determine dengue mortality during the outbreak.MethodsAll laboratory-confirmed dengue cases and deaths were included in this study. Incidence and mortality were calculated according to demographic variables.ResultsA total of 5221 laboratory-confirmed cases of dengue were included in this analysis. The majority of patients were male (54.5%) and indigenous Fijians (iTaukei) (53.5%). The median age was 25 years old. The overall incidence was 603 per 100 000 population. The age-specific incidence was highest among people between 20 and 24 years of age (1057 per 100 000) for both sexes. The major urban and peri-urban areas of Suva and Rewa subdivisions reported the highest incidence of > 1000 cases per 100 000 population.​A total of 48 deaths were included in this analysis. The majority of dengue-related deaths occurred in males (62.5%) and in the iTaukei (60.4%) population. The median age at death was 35 years old. The overall dengue-related deaths was estimated to be 5.5 deaths per 100 000 population. Dengue mortality was higher for males (6.8 per 100 000) than females. The highest age- and sex-specific mortality of 18 per 100 000 population was among males aged 65 years and older.DiscussionDengue morbidity and mortality were highest among males, indigenous people and residents of urban and peri-urban locations. Effective and integrated public health strategies are needed to ensure early detection and appropriate outbreak control measures.

A predator in the park: mixed methods analysis of user preference for coyotes in urban parks

ABSTRACTThis mixed methods study explores the relative preference people in the United States have for sharing leisure space in their local urban parks with coyotes. Two rounds of survey data (n= 482) and a series of interviews (n= 28) were conducted. In both survey samples, people preferred to share park space with coyotes less than all other species options (e.g., people experiencing homelessness, off-leashdogs). Interview data suggest that the primary reason for this lack of desire to share park space with coyotes is a perception that coyotes are dangerous for people and pets. This strong level of preference against coyotes has implications for current efforts to promote human-wildlife coexistence strategies in many urban and peri-urban locations.

The Eastern Grey Kangaroo: A Modern Conservation Dilemma

ABSTRACT The interaction between Eastern Grey Kangaroos (Macropus giganteus) and humans in peri-urban locations is one that excites great passion between conflicting views. Are the kangaroos a prob...

Effects of Water Quality and Post-Harvest Handling on Microbiological Contamination of Lettuce at Urban and Peri-Urban Locations of Ouagadougou, Burkina Faso.

Vegetable production in urban gardens of Ouagadougou contributes to food security, but water for irrigation is often of low quality. This is particularly acute if irrigation water is taken from wastewater polluted channels. This study aimed at (i) verifying to what degree irrigation water quality is correlated with contamination of lettuce with Escherichia coli, total coliforms, and Salmonella spp., and (ii) assessing effects of post-harvest handling on pathogen development during the trade chain. We tested pathogen removal efficiency on lettuce by applying post-harvest washing. Irrigation water of production areas in Ouagadougou (n = 10) showed a mean E. coli load of 2.1 × 105 CFU 100 mL−1. In 60% of the cases, irrigation water did not meet the standards of the World Health Organization (WHO) for safe irrigation water, and in 30% of the cases, irrigation water was contaminated with Salmonella spp. Loads of total coliforms on lettuce leaves ranged from 2.9 × 103 CFU g−1 to 1.3 × 106 CFU g−1, while E. coli averaged 1.1 × 102 CFU g−1. Results on post-harvest handling revealed that microbial loads increased along the trade chain. Overall, half of all lettuce samples (n = 60) were tested positively for Salmonella spp. The experiment showed that appropriate post-harvest handling could prevent the increase of total coliforms.