Foraging in the tropics: relationships among species’ abundances,niche asymmetries and body condition in an urban avian assemblage

Two main theories attempt to explain species coexistence: the neutral theory considers all the species as equivalents so biodiversity is mainly regarded as a function of total available resources (i.e. niche expansion), while the niche theory stresses the relevance of differences in niche use between species (i.e. niche packing). The relative importance of these forces is under discussion and has been largely tested in natural ecosystems. However, few studies have addressed this issue in tropical-urban environments. In this work we studied niche overlap asymmetries among the most common urban resident birds, and the effect of habitat type on this pattern, in a subtropical location of South China (Nanning, Guangxi). We found differences in abundances and niche use among species and urban habitats (parks, streets and orchards). We also recorded strong asymmetries in niche use between species, which we divided into three categories: species with positive asymmetries, which showed highly specific niches and were able to exploit other species’ niches; species with neutral asymmetries, which showed high levels of niche overlap with the rest of species; and species with negative asymmetries, which showed low specificity in their niches and were unable to exploit other species’ niches. These differences in niche use correlated with differences in fat scores. Species from the first group showed higher fat scores than other two groups. Ultimately, niche asymmetries correlated with species’ body condition and mediated their differences in abundance, which supports the view that in this urban context niche theory is more appropriate than neutral theory.     

Expanding “Irish Family” Repertoires: Exploring Gay Men's Experiences as Parents in the Republic of Ireland

ABSTRACT

This article explores gay men's parenting experiences and practices in order to seek insight into how gay men accept or challenge heterosexual family norms and how “family” is understood in the Irish context. It is based on small-scale qualitative research (interviews) with seven gay fathers. Despite the limited routes to parenthood for gay men in Ireland, the research findings indicate that the participants enjoy parenting and that they are motivated in their parenting practices. The gay fathers in this study are participative parents who have made significant decisions in their lives in order to prioritize their children's welfare. The diversity of family constellations and care arrangements that surround gay fathering in Ireland can expand family and care repertoires beyond the traditional biparent heterosexual norm. Gay fathers in Ireland appear to enjoy some security at the private familial level and in the responses from their families and communities, but they are keenly aware that nontraditional families are given less status in Irish society. Unlike other jurisdictions, gay parenting is not articulated by the gay fathers in this research as a rights-based argument. Instead, these Irish gay fathers are de facto activists who seek to “humanize” gay parenting.     

DEA-Like Efficiency Ranking of Regional Health Systems in Spain

The last decades have witnessed an increasing international concern in assessing how efficiently health care resources are used in producing health. At a country level, comparing the efficiency of regional health systems and ranking the regions accordingly promotes transparency policies and represents an important incentive for the design and implementation of specific programs aimed at improving the quality of health care services within the country. The use of data envelopment analysis (DEA) as a tool for efficiency analysis in the health sector is well-established, but its use with a ranking purpose is discouraged due to lack of discrimination and comparability issues. Using data from the competent health authority in Spain, the purpose of this study is to assess the efficiency of the regional health systems in Spain and identify those regions that are using their health care inputs more efficiently than others, given the observed level of health outcomes. To this aim, a DEA-based model that operates under a common weights basis is used in order to improve discrimination and establish a common scale for a proper comparison of the regional health systems in Spain that can be subsequently ranked by their efficiency score.     

The influence of top management support for ICTs on organisational performance through knowledge acquisition,transfer, and utilisation

This research analyses, first, whether top management support for information and communications technologies has positive consequences for knowledge management by analysing the specific influence of top management support for ICTs on each of the knowledge management processes (knowledge acquisition, transfer, and utilisation). Second, it analyses the influence of each knowledge management process on organisational performance. The theoretical model is tested using data collected from March to May 2010 from 201 CEOs in Spanish technology organisations. The results indicate that the stage-based disaggregation of the knowledge management process into knowledge acquisition, transfer, and utilisation, and the three-stage management process are the mediating mechanisms in the relationship between top management support for ICTs and organisational performance. CEOs should thus support the information and communication technologies necessary to improve all of the interrelated stages of knowledge management as a mechanism for achieving better organisational performance. Various strategic actions should be stimulated within the organisation to intensify the interrelation between these stages of acquisition, transfer, and utilisation of knowledge.     

On the estimation of serial correlation in Markov-dependent production processes

In this paper, we present a study about the estimation of the serial correlation for Markov chain models which is used often in the quality control of autocorrelated processes. Two estimators, non-parametric and multinomial, for the correlation coefficient are discussed. They are compared with the maximum likelihood estimator [U.N. Bhat and R. Lal, Attribute control charts for Markov dependent production process, IIE Trans. 22 (2) (1990), pp. 181–188.] by using some theoretical facts and the Monte Carlo simulation under several scenarios that consider large and small correlations as well a range of fractions (p) of non-conforming items. The theoretical results show that for any value of p≠0.5 and processes with autocorrelation higher than 0.5, the multinomial is more precise than maximum likelihood. However, the maximum likelihood is better when the autocorrelation is smaller than 0.5. The estimators are similar for p=0.5. Considering the average of all simulated scenarios, the multinomial estimator presented lower mean error values and higher precision, being, therefore, an alternative to estimate the serial correlation. The performance of the non-parametric estimator was reasonable only for correlation higher than 0.5, with some improvement for p=0.5.     

The role of right-wing authoritarianism,sexism and culture of honour in rape myths acceptance / El papel del autoritarismo de derechas,del sexismo y de la cultura del honor en la aceptación de los mitos sobre la violación

The purpose of this work is to analyse how some ideological variables (ambivalent sexism, culture of honour, and right-wing authoritarianism) affect rape myths acceptance (RMA). Two hundred and fourteen university students (83 men and 131 women), mean age 20.39 years old, participated. The results show that there is a high correlation between RMA and hostile sexism, benevolent sexism, culture of honour, and right-wing authoritarianism. Hostile sexism and right-wing authoritarianism predict RMA in both male and female samples. Benevolent sexism predicts RMA in the female sample. In addition, in the male sample right-wing authoritarianism interacts with hostile sexism to predict RMA, while in the female sample right-wing authoritarianism interacts with benevolent sexism to predict RMA. These results show the close relationship existing between certain ideological variables and RMA.     

Effect of product and geographic diversification on company performance: Evidence during an economic crisis

Based on a novel sample of Spanish listed companies from nonfinancial sectors, we explore the effect of product and geographic diversification on company performance during an economic downturn. The study develops comprehensive models to understand the interaction effect of both strategies on company performance. We find a U-shaped geographic diversification–performance relationship and no evidence of a positive effect from product diversification, unless combined with high levels of geographic diversification. The results show that companies improved their performance by combining these strategies. The results are robust after controlling for the endogeneity of both types of diversification. Our findings highlight that geographic diversification is an effective and valuable strategy in economic downturns. Furthermore, this study confirms the importance of the interaction between product and geographic diversification to determine the total effect of product or geographic diversification on company performance.     

Lights and shadows on sustainability rating scoring

Many organizations currently publish sustainability ratings that quantify the sustainability of firms by aggregating scores. These organizations analyze companies in economic, social, environmental and corporate governance terms. However, some of these scores are associated with problems of how positive and negative assessments are offset. This work proposes a methodology for using fuzzy logic in the design of a comprehensive sustainability rating for firms. This technique for measuring sustainability addresses the complexity of the concept and enables the incorporation of expert knowledge into the system of assessment. This approach is applied to organizational information taken from the 2008 Accountability Rating and corrects one of the weaknesses revealed by methodologies based on the aggregation of scores—the offset effect—enabling decision-maker to manage it. This is considered an important research topic because of the growth of social responsible financial markets, and the fact that investors are demanding more accurate information.     

Spatial Distribution of Social Inequality in the Metropolitan District of Quito,Ecuador

Social Indicators Research - Exploring the spatial variation of regional social inequality allows the design of public policies; therefore, this study analyzes this phenomenon in the Metropolitan...