Riparian woody plant diversity and forest structure along an urban-rural gradient

Changes in riparian woody plant assemblages are anticipated in the southeastern United States due to increases in urbanization rates. Because riparian forests serve important roles in maintaining water quality and biodiversity, understanding how they respond to urbanization is crucial. The objective of this study was to examine forest structure and woody vegetation diversity indices of riparian communities in response to an urbanization gradient in West Georgia, USA. Measures of forest structure and diversity were compared to measures of urbanization and land cover. Although Liquidambar styracifluaand Quercus nigrawere dominant species in the forest stand and regeneration layer for all riparian communities, the invasive, non-native shrub Ligustrum sinense was the most dominant species observed in the regeneration layer for urban, developing, and agriculture communities. The proportion of non-native species in the forest stand and regeneration layer decreased and Shannon diversity of the regeneration layer increased with increasing distance from the urban center. Shifts in diversity indicate that anthropogenic disturbance may subdue the ability of diverse communities to resist non-native plant invasions.     

Evaluating the Social Environment Component of Social Work Courses on Human Behavior and the Social Environment

SUMMARY

This analysis of 117 foundation of Human Behavior and Social Environment (HB&SE) course outlines gathered from 60 graduate schools of social work is based on the HB&SE standards of the Council on Social Work Education (2001). It draws upon an analytic framework for integrating content related to the social environment. Specific criteria for assessment included how well the course outline reflected the reciprocal nature of human behavior and the social environment, presented a strengths perspective, incorporated diversity content, and covered material related to families, groups, organizations, communities, and political economy. Four types of HB&SE course outlines were identified (lifespan-oriented, systems-oriented, theory-oriented, and combination), and results are presented by course outline type. The findings suggest that increased attention to content related to the macro social environment, human diversity, well-being, and theory for practice is needed to strengthen HB&SE foundation courses.     

Political Economy,Ecological Modernization,and Energy Use: A Panel Analysis of State‐Level Energy Use in the United States, 1960–1990

The present study will examine energy consumption from two competing perspectives within environmental social science: political economy and ecological modernization. These frameworks will be evaluated with a fixed‐effects panel analysis of state‐level energy use between the years 1960 and 1990, based on data for 50 states plus Washington, DC, from the Energy Information Administration’s State Energy Data System. The results from the panel analysis show that the increase in total energy use between 1960 and 1990 depended on both increasing economic growth and urbanization, even after controlling for population size, industrialization, and inflation‐adjusted energy prices. The results challenge the claims of ecological modernization theory and support a political economic approach to the study of changes in energy use. In the conclusion, the study’s findings will be framed within the context of the early twenty‐first‐century economic and ecological crises. In light of efforts to reduce greenhouse gas emissions, this study can also further advance the renewable energy debate by reminding us of the social drivers of energy use.     

Nest design in a changing world: Great tit <Emphasis Type="Italic">Parus major</Emphasis> nests from a Mediterranean city environment as a case study

Investigations of urbanization effects on birds have focused mainly on breeding traits expressed after the nest-building stage (e.g. first-egg date, clutch size, breeding success, and offspring characteristics). Urban studies largely ignored how and why the aspects of nest building might be associated with the degree of urbanization. As urban environments are expected to present novel environmental changes relative to rural environments, it is important to evaluate how nest-building behavior is impacted by vegetation modifications associated with urbanization. To examine nest design in a Mediterranean city environment, we allowed urban great tits (Parus major) to breed in nest boxes in areas that differed in local vegetation cover. We found that different measures of nest size or mass were not associated with vegetation cover. In particular, nests located adjacent to streets with lower vegetation cover were not smaller or lighter than nests in parks with higher vegetation cover. Nests adjacent to streets contained more pine needles than nests in parks. In addition, in nests adjacent to streets, nests from boxes attached to pine trees contained more pine needles than nests from boxes attached to other trees. We suggest that urban-related alterations in vegetation cover do not directly impose physical limits on nest size in species that are opportunistic in the selection of nesting material. However, nest composition as reflected in the use of pine needles was clearly affected by habitat type and the planted tree species present, which implies that rapid habitat change impacts nest composition. We do not exclude that urbanization might impact other aspects of nest building behaviour not covered in our study (e.g. costs of searching for nest material), and that the strengths of the associations between urbanization and nest structures might differ among study populations or species.     

Toward a Sociology of Nature

Although we often believe that nature stands apart from social life, our experience of nature is profoundly social. This paper unpacks this paradox in order to (1) explain sociology's neglect of the environment and (2) introduce the articles in this special issue on “the sociology of nature.” I argue that sociology's disinterest in the biophysical world is a legacy of its classical concern with tracing society's “Great Transformation” from gemeinschaft to gesellschaft: while early anthropologists studied “primitive” societies that allegedly had not yet completed “the passage from nature to culture” (Lévi‐Strauss 1963 : 99), pioneering sociologists presumed that industrialization and urbanization liberated “modern” society from nature and therefore focused their attention on “urbanism as a way of life” (Wirth 1938 ). As exemplified by the articles in this symposium, environmental sociology critiques the nature‐culture and town‐country dualisms. One of environmental sociology's core contributions has been demonstrating that nature is just as much a social construction as race or gender; however, its more profound challenge to the discipline lies in its refutation of the sociological axiom that social facts can be explained purely through reference to other social facts. “Environmental facts” are a constitutive feature of social life, not merely an effect of it.     

NON‐MONETARY INCENTIVES AND OPPORTUNISTIC BEHAVIOR: EVIDENCE FROM A LABORATORY PUBLIC GOOD GAME

This study reports data from a laboratory experiment that investigates the incentive effect of three distinct social communication schemes on free‐riding behavior. We use performance‐based approval and disapproval ratings and a linear public good game to address the above issues. The treatments vary in terms of subjects' opportunities to anonymously assign (1) only the approval ratings to other group members, (2) only the disapproval ratings to other group members, and (3) either the approval or the disapproval ratings to other group members (but not both to the same group member), after they play a standard linear public good game. Despite the Nash prediction of zero individual contribution in all three treatments, the data show that the disapproval points generate significantly higher contribution than the approval points. The treatment in which subjects could communicate either the approval or the disapproval points produces the highest level of contribution. We discuss the implications that these findings may have for efficient design of organizations. (JEL D03, H41, C72, C92)     

Bird community responses to different urban conditions in La Paz,Bolivia

Urbanization alters ecosystems worldwide, but little is known about its effects in the Neotropical region. In the present research we examined the relative influence of different levels of urbanization and of some urban development measures on bird species richness, abundance and composition. We surveyed 104 observation stations at which we collected data on the relative abundance of bird species, and also data on seven environmental variables as measures of urban development and human activity. We registered 57 native bird species. Bird species richness and bird abundance increased with lower urbanization levels. Both variables were positively related to vegetation cover and native vegetation, and negatively to built-up cover, abundance of Rock Pigeon (Columa livia), pedestrian rate and car rate. A canonical correspondence analysis produced a significant model that explained 37% of the total variation in species data. This analysis segregated bird species along two important gradients: urbanization and elevation. The most urbanized areas were dominated by a few synanthropic species tolerant to human disturbance, such as Rufous-Collared Sparrow (Zonotrichia capensis), Eared Dove (Zenaida auriculata) or Chiguanco Thrush (Turdus chiguanco). Areas with lower urbanization levels had more species typically associated with native vegetation, such as Plain-Mantled Tit-Spinetail (Leptasthenura aegitaloides) or D’Orbigny’s Chat-Tyrant (Ochthoeca oenanthoides), among others. Elevation had a significant influence in structuring bird communities, with some species restricted to higher elevations and some to lower elevations. Although changes in elevation had an important influence, urbanization had a stronger effect on structuring bird communities. This study provides valuable information and an important baseline for future studies.     

Marital Quality and Personal Well‐Being: A Meta‐Analysis

This study examines the association between marital quality and personal well‐being using meta‐analytic techniques. Effects from 93 studies were analyzed. The average weighted effect size r was .37 for cross‐sectional and .25 for longitudinal effects. Results indicate that several variables moderate the association between marital quality and personal well‐being, including gender, participants’ marital duration, source of measurement, data collection year, and dependent variable. These results suggest that longitudinal effects are more likely to be uncovered when using standard measurement and that future research should use samples homogenous in marital length. The longitudinal finding that the strength of the association is stronger when personal well‐being is treated as the dependent variable supports previous theorizing.     

The Environmental Consequences of Rural and Urban Population Change: An Exploratory Spatial Panel Study of Forest Cover in the Southern United States, 2001–2006

This exploratory study examines the effects of rural and urban population change on forest cover at the local level across the southern United States. Using county‐level data from the National Land Cover Database and other U.S. government sources, we regressed the total area of forest cover on rural and urban population size in spatial panel models with two‐way fixed effects. When we controlled for several other factors, including the number of forestry operations at the county level, regression results indicate that urban change had no effect, but rural population size was positively related to total forest area, and this effect was most pronounced in and around Georgia. Thus, in areas of the southern United States, rural growth was associated with afforestation, not deforestation. We speculate on how this unusual finding contributes to the debate between ecological modernization and urban political economy implicated in previous cross‐national research.     

Trampling tolerance of understorey vegetation in different hemiboreal urban forest site types in Finland

The effects of trampling on the understorey vegetation were studied in boreal urban forests of different fertility in the greater Helsinki area, Finland. The three studied forest types in decreasing order of fertility were: 1) herb-rich heath forest, 2) mesic heath forest, and 3) sub-xeric heath forest. We inventoried the cover percentages of understorey vegetation in 40 herb-rich, 75 mesic and 40 sub-xeric biotopes located in 51 urban forests varying in size (0.6–502 ha). Cover percentages were compared to those of untrampled reference areas. In our study, trampling tolerance increased with increasing fertility of the forest type. Wear of understorey vegetation correlated positively with the number of residents (i.e. recreational pressure) around the forest patch. In general, understorey vegetation cover in all three forest types was lower than in the same forest types in untrampled reference areas. Ground layer cover in urban forests was less than half of that in reference areas. Mosses, lichens, and dwarf shrubs, especially Vaccinium vitis-idaea, proved to be sensitive to trampling and consequently decreased in cover. The cover of tree saplings, mainly Sorbus aucuparia, and some resilient herbs increased.     

Distribution and activity of bats at local and landscape scales within a rural–urban gradient

We examined the relationship between bat species activity and composition and the extent of forest cover and urbanization in and adjacent to 11 U.S. National Park Service, National Capital Region Parks in Maryland, Virginia, West Virginia, and Washington, D.C., from 2003–2004, using mist nets, harp traps, acoustical detectors, and visual observations in a variety of habitats. Our efforts included 363 trap nights across 74 sites along with acoustical sampling at 362 sites. We captured 383 bats and identified 6,380 echolocation passes of 6 species. Both overall and species-specific activities were affected more by forest fragmentation within parks than by urbanization adjacent to parks. With an ability to exploit anthropogenic structures for day-roosts, big brown bats (Eptesicus fuscus) were the most ubiquitous and probably the most abundant species in NCR Parks, particularly in forested, urban parks. Northern myotis (Myotis septentrionalis), and to a lesser extent, little brown myotis (Myotis lucifugus) were more prevalent in forested, rural parks of the Ridge and Valley and Blue Ridge than in eastern, less forested urban parks of the Piedmont and Coastal Plain physiographic provinces. Retention of larger, residual forest tracts and day-roosting habitat (i.e., trees and snags) would be beneficial to most species, as urban expansion continues throughout the region.     

Interorganizational network portfolios of nonprofit organizations: Implications for collaboration management

Increasingly, nonprofit organizations engage in interorganizational collaboration to address large‐scale social problems. Scholarship typically focuses on the characteristics of both within‐sector and cross‐sector partnerships of two collaborating organizations or all partnering organizations involved in a collaboration, but we know little about the patterns of interorganizational relationships that single nonprofit organizations maintain. This research draws upon surveys from 452 nonprofits and introduces nonprofit network portfolios, which we define as the number, integration, intensity, and duration of relationships that nonprofits purposefully develop with other organizations. Using 12 network measures, Ward cluster analysis revealed three distinct network portfolios: restricted within‐sector (n = 319, 70.58%), which included limited collaboration and prioritized within‐sector partnerships; robust within‐sector (n = 80, 17.70%), which included more nonprofit partnerships than restricted within‐sector portfolios; and cross‐sector (n = 53, 11.72%), which had a rich assemblage of integrative partnerships with nonprofits, businesses, and government agencies. Further, nonprofits that maintained each type of portfolio differed in their revenue and social mission, suggesting these factors are related to the types of collaboration that nonprofits maintain. This study makes contributions to existing research on interorganizational networks and cross‐sector collaboration and suggests practical and policy implications for nonprofit network management.     

Social Work Academics as Humboldtian Researcher‐Educators: Discussion of a Survey of Staff Profiles from Schools in Denmark,England and Germany

A survey of social work academics' education profiles in Denmark, England and Germany is discussed. Material was collected in 2004, mainly from schools' Internet websites. Findings were classified by highest achieved level of qualification, using British terminology: ‘diploma’, ‘degree’ and ‘doctoral’. Findings are discussed with reference to the status of social work knowledge and social work education. This discussion is framed by drawing on the model of the teacher‐researcher developed by Wilhelm von Humboldt (1767–1835). The German sample showed the highest proportions of social work academics with doctoral qualifications, with the lowest levels being found in the Danish sample and the English sample being situated in‐between.     

WHEN DO SHELTER‐IN‐PLACE ORDERS FIGHT COVID‐19 BEST? POLICY HETEROGENEITY ACROSS STATES AND ADOPTION TIME

This study explores the impact of Shelter‐in‐Place Orders (SIPOs) on health, with attention to heterogeneity in their impacts. First, using daily state‐level social distancing data, we document that adoption of a SIPO was associated with a 9%–10% increase in the rate at which state residents remained in their homes full‐time. Using daily state‐level coronavirus case data, we find that approximately 3 weeks following the adoption of a SIPO, cumulative COVID‐19 cases fell by approximately 53.5%. However, this average effect masks important heterogeneity across states‐early adopters and high population density states appear to reap larger benefits from their SIPOs. (JEL H75, I12, I18)     

Aversive Peer Experiences on Social Networking Sites: Development of the Social Networking‐Peer Experiences Questionnaire (SN‐PEQ)

Cyber victimization is an important research area, yet little is known about aversive peer experiences on social networking sites (SNSs), which are used extensively by youth and host complex social exchanges. Across samples of adolescents (n = 216) and young adults (n = 214), we developed the Social Networking‐Peer Experiences Questionnaire (SN‐PEQ) and examined its psychometric properties, distinctiveness from traditional peer victimization measures, and associations with internalized distress. The SN‐PEQ demonstrated strong factorial invariance and a single‐factor structure that was distinct from other forms of peer victimization. Negative SNS experiences were associated with youths' symptoms of social anxiety and depression, even when controlling for traditional peer victimization. Findings highlight the importance of examining the effects of aversive peer experiences that occur via social media.     

Between “Here” and “There”: Immigrant Cross‐Border Activities and Loyalties

This paper provides an empirical assessment of the prevalence and determinants of cross‐state social exchanges and attachments among Latin American immigrants living in the United States. As we shall show, using data from a recent survey of Latin American migrants living in the United States, migrant cross‐state social action comes in a variety of types, with the direction of conditioning factors differing from one type to another. Moreover, social and political incorporation in the United States reduces affective ties and provision of material support, all the while facilitating other forms of cross‐state social action. Consequently, while international migrants regularly engage in trans‐state social action, the paper shows that neither transnationalism as condition of being, nor transmigrants, as distinctive class of people, is commonly found.     

The ecology of littoral zone Chironomidae in four artificial,urban, tropical Malaysian lakes

Urbanization is increasingly compromising lakes in the rapidly developing countries of tropical Southeast Asia. Greater understanding of the ecology of tropical lakes is essential in order to determine the best ways to protect and manage them. A comparison was made of the species richness, abundance and diets of Chironomidae in two forest lakes (both created by damming rivers - one in an urban forest reserve, one adjacent to an urban area) and two urban park lakes (ex- tin mine lakes) in Kuala Lumpur, Malaysia. 19 species of chironomids were recorded (10 collector-gatherers, one collector-filterer, one shredder, 3 predators and 4 predators/grazers). The most abundant species were Polypedilum leei, Tanytarsus formosanus, Zavreliella marmorata and Procladius sp.. Conductivity was highest in the urban park lakes due to pollution. Temperature was also highest in the urban park lakes due to lower riparian canopy cover and lower macrophyte abundance. Larval abundance (mostly collector-gathering Chironominae) was significantly higher in the forest lakes compared to the urban park lakes, which could be related to cleaner water and higher vegetation cover which provided more food resources (leaf litter and periphyton) and more microhabitats. Predatory tanypods were most abundant in forest lakes which also had the highest numbers of their prey (Chironominae). Four predatory species of Tanypodinae supplemented their diet with blue-green algae in two of the urban lakes. Only one collector-filterer (Corynoneura sp.) was recorded (only in the forest lakes).

     

A Strengths Perspective on Caregiving at the End-of-life

Abstract

The most recent version of the Australian Association of Social Workers Code of Ethics includes substantial reference to social workers’ professional responsibilities for environmental awareness and advocacy. This article reports on a qualitative study of 20 Australian environmentally-conscious social workers from a variety of fields of practice. The study found that while there was a high level of awareness of the relevance of environmental issues for social work practice, participants reported professional and organisational constraints, which prevented them from aligning their environmental concerns with their professional practice. The findings from this study suggest that proenvironmental views and actions may not yet be accepted as a legitimate aspect of social work practice, despite strong recognition of the links between social justice, human rights, social work, and the environment in the Australian Association of Social Workers Code of Ethics.     

A Longitudinal Examination of Support,Self‐Esteem,and Mexican‐Origin Adolescent Mothers' Parenting Efficacy

Guided by a risk and resilience framework, this study used a prospective longitudinal, multiple‐reporter design to examine how social support from a mother figure during pregnancy interacted with Mexican‐origin adolescent mothers' self‐esteem to inform their parenting efficacy when their children were 10 months old. Using reports of perceived social support by adolescent mothers (M_age = 16.24, SD = 0.99) and their mother figures (M_age = 40.84, SD = 7.04) in 205 dyads, and controlling for demographic factors (i.e., adolescent age, adolescent nativity, family income, mothers' educational attainment, adolescent – mother coresidence) and adolescents' social support from a significant other, the findings indicated that social support during pregnancy was positively associated with adolescent mothers' future parenting efficacy when adolescent mothers had relatively lower self‐esteem. The findings were consistent for adolescents' and mothers' reports and emphasize the value of social support from a mother figure among adolescent mothers with lower self‐esteem. Implications for interventions are presented.     

A Basic Accounting of Variation in Municipal Solid‐Waste Generation at the County Level in Texas, 2006: Groundwork for Applying Metabolic‐Rift Theory to Waste Generation

Abstract Environmental social scientists debate whether or not modern development reduces society's impact on the biosphere. The empirical research informing the discussion has not yet adequately examined the social determinants of municipal solid‐waste (MSW) generation, an increasingly relevant issue, both ecologically and sociologically. A primary problem for this research concerns the increasing exchange of MSW across state and county borders. A convenient way to avoid this problem is to examine variation between counties with landfills that service only the county in which the landfills are located. I applied this restriction to a cross‐sectional analysis of total MSW generated in Texas at the county level for 2006. Using robust regression, this study found that two basic measures of modern development, population per square mile and per capita income, are both positively related to total MSW generated at the county level and together explain about 73 percent of the variation in the dependent variable. The evidence corroborates the metabolic‐rift theory. The concentration of people onto smaller land areas, or urbanization, and increasing wealth in a capitalist economy contribute to the metabolic rupture between human society and the environment.