Improving confidence in tree species selection for challenging urban sites: a role for leaf turgor loss

High species diversity is argued to be the most important requisite for a resilient urban forest. In spite of this, there are many cities in the northern hemisphere that have very limited species diversity within their tree population. Consequently, there is an immense risk to urban canopy cover, if these over-used species succumb to serious pests or pathogens. Recognition of this should motivate the use of less commonly used species. Analysis of plant traits, such as the leaf water potential at turgor loss (Ψ_P0), can provide useful insights into a species’ capacity to grow in warm and dry urban environments. Therefore, the aim of this study was to evaluate Ψ_P0 of 45 tree species, the majority of which are rare in urban environments. To help evaluate the potential for using Ψ_P0 data to support future decision-making, a survey of professionals engaged with establishing trees in urban environments was also used to assess the relationship between the measured Ψ_P0 and the perceived drought tolerance of selected species. This study demonstrates that Ψ_P0 gives strong evidence for a species’ capacity to tolerate dry growing conditions and is a trait that varies substantially across species. Furthermore, Ψ_P0 was shown to closely relate to the experience of professionals involved in establishing trees in urban environments, thus providing evidence of its practical significance. Use of plant traits, such as Ψ_P0, should, therefore, give those specifying trees confidence to recommend non-traditional species for challenging urban environments.     

Transition to Work: Effects of Preparedness and Goal Construction on Employment and Depressive Symptoms

This study examines the mediating role of employment preparedness in improving employment, mental health, and construction of work‐life goals among young vocational school graduates who participated in the School‐to‐Work effectiveness trial. The trial included a 1‐week intervention program that focused on enhancing employment preparedness. In this trial, 416 graduates of secondary vocational institutes were randomized into a control and experimental group. All the study participants were assessed at baseline, immediately after the intervention, and 10 months later. The results showed that the School‐to‐Work intervention increased employment preparedness, which in turn increased employment at the 10‐month follow‐up. Furthermore, employment predicted work‐life‐related personal goals and lower financial strain, which in turn was associated with lower depressive symptoms. The implications for theory and practice are discussed.     

Extracting a revised labor supply theory from Becker's model of the household

Conflicting assumptions about labor supply behavior lie at the nexus of ideological and theoretical debates regarding the reality of involuntary unemployment, the efficacy of Keynesian macro-policy, and the appropriate nature of welfare policy. This can in part be attributed to the fact that orthodox theory is effectively predicated upon describing the behavior of individuals whose level of affluence enables them to voluntarily withhold their labor from the market. Ironically, a means of resolution appears if we extend Gary Becker's utility producing model of the household to recognize two latent behavioral concerns: (1) the ‘need’ of households for money income in order to produce utility, and (2) the presence of work activity in the home. The resulting generalized labor supply model extends Becker's analysis to explicitly encompass both the behavior of the affluent, and the behavior of the poor who need to work in order to sustain their existence.     

Under One Roof: A Review of Research on Intergenerational Coresidence and Multigenerational Households in the United States

What motivates adult children, parents, and even grandchildren to live together? To answer this question, we review the sociological and social gerontological research on multigenerational households and families. We first provide a snapshot of multigenerational coresidence in the US and then discuss the primary theoretical perspectives used to explain these patterns: exchange theory, altruism, and norms and obligations. Structural conditions including economic crises tend to facilitate adult children moving in with parents (often with dependent children in tow), while spousal loss and declining health act as catalysts for parents moving in with adult children. Furthermore, economic struggles often facilitate the formation of grandparent-headed families where the middle generation parents may or may not be present. We suggest that the current economic recession and housing crises will have profound effects on multigenerational households and may also encourage more coresidence. Changes in social welfare policies, increases in coresident grandparenting, and changes in the racial and ethnic composition of the US also have implications for multigenerational households’ economic and social security.     

Relational sociology,pragmatism, transactions and social fields

Starting from the idea that relational sociology has been founded on various and incompatible social ontologies, I argue that it is at risk of losing its raison d'être if we do not answer two fundamental practical and ontological questions: (1) Why do we need relational sociology? and (2) What do we study in relational sociology? In this respect, I propose a deep, transactional sociology partly and freely inspired by the work of J. Dewey which clearly detaches relational sociology from social determinism and co-determinism.     

‘I nearly lost my work’: chance encounters,legal empowerment and the struggle for disability rights in Ghana

This article uses a case study from Ghana to argue that rights-based legal instruments are important but insufficient steps towards securing disability rights in non-western societies. Despite Ghana’s implementation of a Disability Act and ratification of the United Nations Convention on the Rights of Persons with Disabilities, a grassroots perspective shows that legislation and the model of legal empowerment will not automatically produce equal access to human rights. The paper will present this argument through a case study of an individual who became disabled in 2008 and struggled for four years to secure his rights to healthcare and employment. I also argue that the case has a wider significance for disability rights in Ghana and beyond.     

Soil microbial community of urban green infrastructures in a polar city

Urban and technogenic landscapes in subarctic zones are not considered comfortable habitats for soil microbiota. However, green infrastructures in polar cities can provide a new niche for the development of a microbial soil community. Soil microbial biomass and the diversity of cultivable microfungi have been studied in relation to the chemical and morphological properties of urban soils in the polar city of Apatity. The quantitative indicators based on fluorescence microscopy and PCR real-time methods as well as the qualitative composition of the cultivable microfungal community were used to characterize the microbial community. Changes in the morphological and chemical composition of urban soils included a shift in pH and increased C and N content compared with forest soil. Studies have shown that the biomass of microfungi and actinomycetes in urban soils was lower than in forest soils and equals 0.12–0.19 mg/g and 0.06–0.44?×?10^?3 mg/g, respectively. Bacterial biomass, on the contrary, increased in urban soils up to 2.6?×?10^–3 – 5.6?×?10^–3 mg/g. The number of ITS gene copies of fungi in urban soils varied from 5.0?×?10⁹ to 1.45?×?10¹⁰ copies/g of soil, reaching the highest values in the courtyard. The number of rRNA gene copies of bacteria and archaea in urban soils increased compared with forest soil and amounted to 2.37?×?10¹⁰ – 9.99?×?10¹⁰ and 0.4?×?10¹⁰ – 0.8?×?10¹⁰ copies/g of soil, respectively. In urban soils, morphological changes in microfungi, including the predominance of small spores, were revealed in comparison with forest soils, where mycelium prevailed. An increase in the diversity of microfungi in urban soil and changes in the structure of their communities compared with forest soil was noted. Microfungi found in urban soils are not typical of the background soils of the region and would be expected in more southern conditions. Among them, opportunistic fungi species have been identified in humans, which increases the risk of diseases in residents of the northern region.

     

Local spatial log-Gaussian Cox processes for seismic data

AStA Advances in Statistical Analysis - In this paper, we propose the use of advanced and flexible statistical models to describe the spatial displacement of earthquake data. The paper aims to...