Assessing the diversity of the benthic oligochaete communities in urban and woodland ponds in an industrial landscape (Upper Silesia,southern Poland)

Studies were carried out in two mining pond complexes in an industrial landscape. The first complex (consisting of six ponds) was located in an urban area and the second one (consisting of six ponds) in a woodland area. The aims of the study were to assess the diversity of benthic oligochaetes and to evaluate which environmental variables are most important in determining variations in the community structure in ponds of varying location. In total, 21 oligochaete species were recorded (7–11 in the urban ponds, 11–15 in the woodland ponds). Aulodrilus pluriseta, Aulodrilus japonicus and Ophidonais serpentina were only found in the woodland ponds, while Potamothrix bavaricus only occurred in the urban ponds. Limnodrilus hoffmeisteri, Limnodrilus claparedeanus, Chaetogaster diaphanus and Ophidonais serpentina dominated in the woodland ponds, whereas Limnodrilus hoffmeisteri, Limnodrilus claparedeanus, Potamothrix bavaricus and Tubifex tubifex prevailed in the urban ponds. The total density of oligochaetes was higher in the urban ponds thought the values of the diversity indices were higher in the woodland ponds. The local diversity of the ponds was high, while the among-site diversity made only a small contribution to the regional diversity. Nonetheless, a cluster analysis divided all of the ponds into two distinct groups depending on their location. CCA analysis showed that conductivity, pH, total hardness, alkalinity, the concentration of chlorides and the content of organic matter in the bottom sediments were most associated with the distribution of some oligochaete species among the ponds studied.     

Does Consumer Confidence Forecast Household Saving and Borrowing Behavior? Evidence for Poland

Consumer confidence plays an important role in households’ decision-making processes. This study investigates the effects of consumer confidence on household saving and borrowing behavior that are unsatisfactorily considered in previous discussions. The questions of interest are first, whether indexes of consumer confidence have any predictive power on their own for future household saving and borrowing rates, and second, whether they contain information about future household saving and borrowing rates aside from the information contained in other available indicators. In addition to aggregate confidence indicators, their components are used to provide more precise information. Overall, the multiple linear regression analysis (OLS technique) of Polish time-series data gives positive answers to both questions. This finding supports the recommendation of combining the strengths of objective indicators (such as economic fundamentals) and subjective indicators (such as consumer confidence) to improve household financial behavior forecasts.     

Educational attainment of childhood immigrants: how does immigration type matter?

This study examines the extent to which the way immigrant parents are selected and admitted matters in the educational attainment of childhood immigrants above and beyond the effects of conventional factors of immigrant vulnerability and resources. Using Canada’s 2011 National Household Survey linked with immigrant landing records, this study finds large differences by admission class in university completion rates for childhood immigrants. Children of skilled workers and business immigrants had much higher university completion rates than children of refugees who, in turn, had higher rates than children of live-in caregivers and in the family class. Advantages or disadvantages associated with the admission class of immigrant parents are passed on to their children, resulting partly from group differences in the education and language ability of parents, and partly from the unique pre- and post-migration circumstances experienced by each immigrant class.     

The Role of Facebook Intrusion,Depression, and Future Time Perspective in Sleep Problems Among Adolescents

The main aim of the study was to examine the determinants of sleep problems including Facebook intrusion, depression, and future time perspective. The participants were 426 adolescents, aged M = 14.68. The Future Time Perspective Scale, the Center for Epidemiologic Studies Depression Scale, the Facebook Intrusion Questionnaire, and the Medical Outcomes Study Sleep Scale were used. It was found that FTP goals were a negative predictor of Facebook intrusion and depression was a positive predictor of Facebook intrusion and sleep problems. Additionally, Facebook intrusion turned out to contribute positively to sleep problems. The results contribute to knowledge on excessive social media use and its relations with mental health; they can be applied in the treatment of addictive social media use.     

An Assessment of Life Satisfaction Responses on Recent Statistics Canada Surveys

Statistics Canada’s General Social Survey (GSS) and Canadian Community Health Survey (CCHS) offer a valuable opportunity to examine the stability of life satisfaction responses and their correlates from year to year within a consistent analytical framework. Capitalizing on the strengths of these surveys, this paper addresses two questions. First, how much variability is observed from year to year and across surveys in the distribution of life satisfaction responses and what accounts for it? Second, how much variability is observed in the direction and magnitude of the correlation between life satisfaction and a consistent set of socioeconomic characteristics? The study shows that the mean level of life satisfaction reported varies from year to year in the GSS but remains stable in the CCHS. This pattern in variability is associated with survey content preceding the life satisfaction question. In contrast, the direction and magnitude of the relationships between life satisfaction and common socioeconomic characteristics is generally consistent between the two surveys and over time.

     

Social Costs of Gambling in the Czech Republic 2012

Evidence about social costs of gambling is scarce and the methodology for their calculation has been a subject to strong criticism. We aimed to estimate social costs of gambling in the Czech Republic 2012. This retrospective, prevalence based cost of illness study builds on the revised methodology of Australian Productivity Commission. Social costs of gambling were estimated by combining epidemiological and economic data. Prevalence data on negative consequences of gambling were taken from existing national epidemiological studies. Economic data were taken from various national and international sources. Consequences of problem and pathological gambling only were taken into account. In 2012, the social costs of gambling in the Czech Republic were estimated to range between 541,619 and 619,608 thousands EUR. While personal and family costs accounted for 63% of all social costs, direct medical costs were estimated to range from 0.25 to 0.28% of all social costs only. This is the first study which estimates social costs of gambling in any of the Central and East European countries. It builds upon the solid evidence about prevalence of gambling related problems in the Czech Republic and satisfactorily reliable economic data. However, there is a number of limitations stemming from assumptions that were made, which suggest that the methodology for the calculation of the social costs of gambling needs further development.     

Variability of bumblebee communities (Apidae,Bombini) in urban green areas

Based on current research the agglomerations are potentially desirable habitats for bumblebees. However, the relationship between the biodiversity of these bees and the green areas where they live is poorly understood. The aim of the study was to estimate the influence of green areas (ranging from 8 to 102 ha) of big cities on bumblebee species richness, composition, and the relative number of these insects. The studies were conducted within the administrative borders of the city of Wroc?aw (Poland) in 2011–2012 in 12 green areas such as parks, cemeteries and other places with trees and shrubs. Species richness and abundance of bumblebees was determined by direct observation during 30 min. The gathered materials were used to calculate how areas of urban green space affected qualitative and quantitative bumblebee community structure. In total, 13 species of bumblebees (Bombus Latr.) were recorded, of which 3 belonged to cuckoo bumblebees (Psithyrus subgenus). The share of the most similar groups was congregated in green areas not smaller than 30 ha. This was proved by analysis of qualitative structure (Sørensen index), quantitative structure (Renkonen index), and qualitative-quantitative structure (Cody’s index). The number of bumblebee species in the surveyed green areas (r = 0.7497) was decisive for the arrangement of the mutual similarity of group structure. Green urban areas should be created in a size of at least 30 ha. Such sites provide conditions for the most diversified bumblebee species communities. Sites smaller than 30 ha can play an important role as refuges, and allow migration to all pollinators.     

Reversal of Fortunes or Continued Success? Cohort Differences in Education and Earnings of Childhood Immigrants1

Using several years of Canadian census data, this study examines cohort differences in educational attainment and earnings among childhood immigrants who arrived in Canada between 1960 and 1989. Successive cohorts of childhood immigrants had increasingly higher university completion rates than their Canadian-born peers by age 25–34. We find that this lead was tempered by declining earnings of immigrant parents relative to Canadian-born parents, particularly among the 1980s cohort. Despite rising university completion rates, wages of male (but not female) childhood immigrants lagged behind those of their Canadian-born peers. This gap can be accounted for largely by the rising share of members of racial minority groups and the decreasing incidence of full-time employment.     

Physical activity of middle-age adults aged 50–65 years in view of health recommendations

The objective of the study was to assess the level of habitual physical activity, mainly its frequency and duration, of middle-age adults aged 50–65 years in a typical week of their life in comparison to the level of these parameters recommended for health benefits. The study carried out in the Upper Silesia region in Poland in May 2010 included 456 deliberately selected subjects (234 women and 222 men) aged 50–65 years. Numeric data were collected by diagnostic survey method using the short version of IPAQ. The surveyed men were characterized by higher level of physical activity than the surveyed women (longer duration and higher frequency) (p?p?相似文献