Foliar nitrogen characteristics of four tree species planted in New York City forest restoration sites

Urban forests provide important environmental benefits, leading many municipal governments to initiate citywide tree plantings. However, nutrient cycling in urban ecosystems is difficult to predict, and nitrogen (N) use in urban trees may be quite different from use in rural forests. To gain insight into these biogeochemical and physiological processes, we compared foliar N characteristics of several common northeastern deciduous tree species across four newly planted New York City afforestation sites as well as at the Black Rock Forest (BRF), a rural oak-dominated forest in the Hudson Highlands, New York. Foliage sampled at BRF was consistently depleted in ¹⁵N compared to urban foliage, and Amelanchier canadensis, Nyssa sylvatica, Prunus serotina, and Quercus rubra showed significant variation in foliar nitrogen isotope signatures (δ¹⁵N) among the four urban sites. A. canadensis and P. serotina showed significantly greater ability to assimilate nitrate at BRF compared to urban sites, as measured through nitrate reductase activity (NRA). There were no significant differences in NRA among tree species growing at the four urban sites. Only P. serotina and N. sylvatica showed significant variation in foliar N concentrations (%N) both among urban sites and compared to BRF. The isotopic and %N data suggest greater N availability but less available nitrate at the newly planted urban sites compared to BRF, possibly due to different anthropogenic inputs or higher rates of nitrification and nitrate leaching at the recently planted urban sites compared to likely lower rates of N cycling in the intact rural forest. In addition, the tree species varied in their response to N availability at the urban sites, with potential implications for growth and survival. Understanding N cycling in urban systems and the associated physiological changes in vegetation is critical to a comprehensive evaluation of urban forest restoration, and may have implications for carbon sequestration and water quality issues associated with nitrate export, two important areas of management concern.     

On adaptive Metropolis–Hastings methods

This paper presents a method for adaptation in Metropolis–Hastings algorithms. A product of a proposal density and K copies of the target density is used to define a joint density which is sampled by a Gibbs sampler including a Metropolis step. This provides a framework for adaptation since the current value of all K copies of the target distribution can be used in the proposal distribution. The methodology is justified by standard Gibbs sampling theory and generalizes several previously proposed algorithms. It is particularly suited to Metropolis-within-Gibbs updating and we discuss the application of our methods in this context. The method is illustrated with both a Metropolis–Hastings independence sampler and a Metropolis-with-Gibbs independence sampler. Comparisons are made with standard adaptive Metropolis–Hastings methods.     

Malaysian researchers talk about the influence of culture on research misconduct in higher learning institutions

Based on a previous survey by the Office of Research Integrity (ORI) in the USA, a considerable number of foreign research scientists have been found guilty of research misconduct. However, it remains unclear as to whether or not cultural factors really contribute to research misconduct. This study is based on a series of interviews with Malaysian researchers from the local universities regarding their own professional experiences involving working with researchers or research students from different countries or of different nationalities. Most of the researchers interviewed agreed that cultures do shape individual character, which influences the way that such individuals conduct research, their decision-making, and their style of academic writing. Our findings also showed that working culture within the institution also influences research practices, as well as faculty mentorship of the younger generation of researchers. Given the fact such misconduct might be due to a lack of understanding of research or working cultures or practices within the institution, the impact on the scientific community and on society could be destructive. Therefore, it is suggested that the institution has an important role to play in orienting foreign researchers through training, mentoring, and discussion with regard to the “does” and “don’ts” related to research, and to provide them with an awareness of the importance of ethics when it comes to conducting research.     

School-Based Racial and Gender Discrimination among African American Adolescents: Exploring Gender Variation in Frequency and Implications for Adjustment

The present study examined school-based racial and gender discrimination experiences among African American adolescents in Grade 8 (n = 204 girls; n = 209 boys). A primary goal was exploring gender variation in frequency of both types of discrimination and associations of discrimination with academic and psychological functioning among girls and boys. Girls and boys did not vary in reported racial discrimination frequency, but boys reported more gender discrimination experiences. Multiple regression analyses within gender groups indicated that among girls and boys, racial discrimination and gender discrimination predicted higher depressive symptoms and school importance and racial discrimination predicted self-esteem. Racial and gender discrimination were also negatively associated with grade point average among boys but were not significantly associated in girls’ analyses. Significant gender discrimination X racial discrimination interactions resulted in the girls’ models predicting psychological outcomes and in boys’ models predicting academic achievement. Taken together, findings suggest the importance of considering gender- and race-related experiences in understanding academic and psychological adjustment among African American adolescents.     

Multilevel relationships between organizational-level incivility,justice and intention to stay

Abstract

This study extends incivility theory and research by applying multilevel theory and analysis to explain the effect of group-level incivility on intention to remain. Previous research has shown that experiencing workplace incivility is associated with adverse individual well-being and behaviour, such as turnover intentions, but the majority of research has been at the individual level of analysis. Consequently it is unknown whether incivility is also a group-level phenomenon, and what the effects of group-level incivility are on the individual. Results from over 34,000 employees working in 179 organizations across Australia and New Zealand showed that target reports of incivility could be aggregated to the level of the organization to form a shared stressor, incivility environment, which affected employees’ intention to remain over and above their personal experience of incivility. This shared or environmental incivility also had a cross-level interaction effect on the negative relationship between individual incivility and intention to remain, highlighting the importance of context on targets of incivility. The role of interactional justice climate was also examined and the data are consistent with justice having a mediating effect on the cross-level relationship between environmental incivility and intention to remain. The findings are relevant to studies of bullying and harassment.     

The Bene‐Anthony Family Relations Test

David, aged twelve, is seated comfortably at a long desk. Arrayed in front of him, within easy reach, are twelve outline drawings of people attached to little cardboard boxes, which serve as bases and have slots at the top for the ‘posting’ of message cards. David has chosen the figures from a larger range that I set out before him at the start of our session, to represent the members of his family. The drawings vary in size, shape, clothing, and hairstyle, but the faces are empty of other features. David found it easy to recognise the figures as adult males and females, plus boys and girls of various ages. The empty faces allowed him to choose figures for each family member, without needing to search for a photographic likeness. The same set of figures used by David can thus be employed by other children to represent their own unique set of family members. David is about to enter the world of the Family Relations Test.     

Rural population density: its impact on social and demographic aspects of rural communities

Using the settled areas of South Australia as a case study, this paper seeks to demonstrate the specific importance of rural population and settlement density as an important variable in understanding the social, population and settlement geography of sparsely settled rural regions, where sparse and falling density presents both practical and conceptual problems for rural planners. After a review of the literature on population density, the case is argued for the use of net rural rather than gross density in the analysis of settlement patterns. The paper then tests a series of hypotheses on the empirical relationship between rural density as independent variable and selected demographic and socio-economic indicators as dependent variables, at two specific points in time. For the same region, points in time and set of indicators, it goes on to compare the predictive power of rural density as an independent variable with that of three other important qualities of rural settlement patterns (remoteness, settlement size and urban concentration). Rural density is found to be a significant explanatory variable, both in its own right and in comparison with the three other variables tested. In conclusion, the findings are related to policy development measures for rural Australia.     

Cultural Valorization and African American Literary History: Reconstructing the Canon

The determinants of and variations in processes of cultural valorization are of increasing interest to sociologists. In the case of high-culture literary texts, the central evaluation process takes place through canon formation. We explore the mechanisms of canon formation and of cultural valorization processes more generally by analyzing the critical history of Zora Neale Hurston's novel Their Eyes Were Watching God. Published in 1937 to lukewarm reviews, the novel is currently considered a core canonical text. We specify three processes involved in the reconstruction of Hurston's novel and in the establishment of the African American literary canon: (1) the application of new evaluative criteria, (2) the reconstruction of textual meaning through newly available interpretative strategies, and (3) changes in the institutional and organizational environment that allowed new claims on high-status critical positions to be made by those previously outside the literary hierarchy. The implications of this study for theoretical models of cultural valorization in sociology are considered.