Browsing by Subject "Diversity"

This thesis introduces readers to the rich tradition of the ecumenical movementand explores how emerging new strategies can benefit congregations as well as facilitate healing in our fractured and divisive world. It argues that the same principles used in ecumenical dialogue can and should be used in the local church. First, the history and significant steps and missteps of the ecumenical movement are briefly examined, before turning to the contemporary strategies of receptive, spiritual and kenotic ecumenism. Then, the paper considers 21st century examples of thriving ecumenical ministries, including survey feedback that provides an intimate look at how one church (Snowmass Chapel) has committed itself to unity across various denominations. Finally, a process is provided for effective ecumenical leadership both within, and outside of, the local church context. Ecumenical work takes courageous leaders who are willing to acknowledge difference without judgement, listen deeply, and be committed to Christian unity in love. The ecumenical movement has made significant strides in the past century and half, yet it has not made a significant move into the local church. This thesis argues that by introducing the concept of ecumenism to local congregations, leaders can initiate change that has far-reaching impacts across all areas of life.

The value of task-related conflict to team effectiveness continues to generate controversy in organizational studies. I argue that this debate reflects as much differences in the conceptualization of conflict by scholars from separate traditions as it does variation in empirical settings and methods. The model proposed in this research is a more general framework for the study of team conflict that clarifies, accommodates, and reconciles to a large degree the divergent findings of prior research. It suggests that recent pessimism about the value of team conflict is overstated, and it offers a number of promising paths through which task-related conflict may improve team performance and satisfaction. Chapter 1 reviews the history of this debate and introduces the model of team conflict. Chapter 2 documents a test of the model's propositions in a correlational study of 223 MBA teams conducting a decision-making exercise. Chapter 3 features an experimental test of the model with a forecasting task completed by 60 3-person groups. And Chapter 4 revisits the conflict over conflict in light of the studies presented herein.

Although many organizations aspire to be diverse, both in their internal composition and external collaborations, diversity's consequences for organizational outcomes remain unclear. This project uses three separate studies to examine how diversity within and across organizations influences organizational outcomes. The first study uses original data from a national study of organizations to analyze how an organization's internal social composition is associated with its performance. It advances diversity-performance research by demonstrating how the mechanisms of social bridging and social bonding can work together within a diverse organization to improve its performance. The findings suggests that an organization can improve its performance by having socially diverse members who interact often and in ways that engage their social differences. The second study integrates social capital theory and network analysis to explore the relationship between interorganizational networks and organizational action. It uses cross-sectional and panel data from a national study of congregations to analyze the collaborative partnerships congregations form to provide social services. This study demonstrates that a congregation's network ties, net of the effects of its internal characteristics, are significantly associated with the number and types of social service programs it offers. The third study illustrates how an organization's external ties can shape its action by examining black churches and their responses to people living with HIV/AIDS. It uses data from a nationally representative sample of black congregations and draws on institutional theory to analyze congregations as open systems that can be influenced by their surrounding environment. This study indicates that black churches that are engaging their external environment are significantly more likely to have an HIV/AIDS program. Overall, by analyzing how individuals interact within organizations and how organizations interact with one another, these three studies demonstrate how diverse networks influence organizational outcomes.

Human welfare depends heavily on ecosystem services like water purification and nutrient cycling. Many of these ecosystem services, in turn, rely on reactions performed by microbes and yet remarkably little is known about how anthropogenic impacts are affecting the structure and function of microbial communities. To help address this knowledge gap, this dissertation uses field surveys and laboratory experiments to examine how watershed urbanization affects microbial communities in receiving streams. We focus on a specific functional group and its associated function - the denitrifying bacteria and denitrification. Denitrifying bacteria use reactive nitrogen and organic carbon as substrates to perform denitrification. Denitrification is one of the few ways to permanently remove reactive nitrogen from ecosystems. Since excess reactive nitrogen in water contributes to serious water quality and human health problems like toxic algal blooms and bowel cancer, denitrification in streams can be considered a valuable ecosystem service. Watershed urbanization, however, may alter the structure of denitrifying bacteria communities in ways that constrain their capacity to remove reactive nitrogen from streams.

Watershed urbanization leads to drastic changes in receiving streams, with urban streams receiving a high frequency of scouring flows, together with increased nutrient (nitrogen and carbon), contaminant (e.g., heavy metals), and thermal pollution. These changes are known to cause significant losses of sensitive insect and fish species from urban streams. Microbes like denitrifying bacteria may be similarly affected. In the first part of this dissertation, we describe results from four repeated surveys of eight central North Carolina streams affected to varying degrees by watershed urbanization. For each stream and sampling date, we characterized both overall and denitrifying bacterial communities and measured denitrification potentials. Differences in overall and denitrifying bacteria community composition were strongly associated with the urbanization gradient. Denitrification potentials, which varied widely, were not significantly associated with substrate supply. By incorporating information on the community composition of denitrifying bacteria together with substrate supply in a linear mixed-effects model, we explained 45% of the variation in denitrification potential (p < 0.001). Results suggest that 1) watershed urbanization can lead to significant changes in the composition of bacterial communities in streams and 2) such changes may have important functional consequences.

The second part of this dissertation examines how urbanization-driven changes to the structure of denitrifying bacteria communities might affect the way they respond to stress or disturbance. Some communities can resist changes to functionality in response to disturbance, potentially as a result of previous exposure and subsequent adaptation (legacy hypothesis) or high diversity (insurance hypothesis). We compare the resistance of two structurally distinct denitrifying bacteria communities to experimental disturbances in laboratory microcosms. Communities originated from either a polluted, warm urban streams or a relatively pristine, cool forest stream. In this case, the two communities had comparable compositions, but forest communities were more diverse than their urban counterparts. Urban communities experienced significant reductions in denitrification rates in response to the most severe increased pollution and temperature treatments, while forest communities were unaffected by those same treatments. These findings support the insurance, but not the legacy hypothesis and suggest that the functioning of urban streams may be more susceptible to further environmental degradation than forest streams not heavily impacted by human activities.

In the third part of this dissertation, we discuss results from a one-time survey of denitrifying bacteria communities and denitrification potentials in 49 central North Carolina streams affected to varying degrees by watershed urbanization. We use multivariate statistics and structural equation modeling to address two key questions: 1) How do different urban impacts affect the structure of denitrifying bacteria communities and 2) How do abiotic (e.g., temperature) versus biotic (denitrifying bacteria community structure) factors affect denitrification potentials in urban streams? Denitrifying bacteria community structure was strongly affected by the urban impacts measured. Community composition responded to increased temperatures, substrate supply, and contamination, while diversity responded negatively to increased temperatures and hydrologic disturbance. Moreover, increased temperatures and substrate supply had significant positive effects, while urbanization-driven changes to denitrifying bacteria community structure had significant negative effects on denitrification potential. The structural equation model captured 63% of the variation in denitrification potential among sites and highlighted the important role that microbial community structure can play in regulating ecosystem functioning. These findings provide a novel explanation for recent observations of decreasing denitrification efficiency with increasing urbanization. Ultimately, we hope findings from this dissertation will help inform more effective stream management and restoration plans and motivate ecologists to consider including microbial community structure in ecosystem models of microbe-mediated processes.

Rising demographic diversity and persistent social inequality are two defining features of youths’ social worlds, and schools and neighborhoods are key developmental contexts where this component of contemporary life plays out. This dissertation aimed to better understand the developmental implications of these twin phenomena, focusing specifically on adolescence, a critical period of development characterized by profound neurobiological and social cognitive changes. Across three studies, I asked, (1) how does exposure to different types of diversity and inequality in schools and neighborhoods relate to adolescent mental health and academic engagement? and (2) how do these relations differ across contexts and according to individual socioeconomic and racial-ethnic identity?The first chapter examined the relation between how schools say they value diversity and adolescent belonging, mental health, and academic engagement across racial groups. Results indicate that when schools’ mission statements conveyed explicit support for diversity (versus exhibiting color-evasive ideologies), racial disparities in mental health, educational aspirations, and reading achievement were smaller. However, when there was a mismatch between how schools said they value diversity and how such values were put into practice, schools’ proclaimed support for diversity was negatively associated with mental health, especially among White youth. The second chapter examined how exposure to rising inequality within neighborhoods—vis-à-vis gentrification—may impact educational outcomes. I found small positive associations between living in a gentrifying (versus chronically disinvested) neighborhood and 12th grade cumulative grade point average, intentions to pursue higher education, and one dimension of school quality: exposure to experienced teachers. However, these potential benefits of gentrification were concentrated among youth who were not economically disadvantaged and White youth. Further, for Black youth, the relation between gentrification and postsecondary plans varied according to the degree of racial turnover occurring in gentrifying neighborhoods—Black gentrification was positively associated with intentions to pursue college, but White gentrification was not. The third chapter examined two psychological mechanisms through which living in a gentrifying neighborhood may impact reading and math achievement: educational aspirations and psychological distress. Overall, there was a positive direct association between gentrification and achievement, and limited evidence of mediation. However, the pathways linking gentrification to educational aspirations, psychological distress, and achievement differed across socioeconomic and racial groups in nuanced ways that illuminate the potential costs and benefits of living in a changing neighborhood during adolescence. These three studies contribute to advancing the education, adolescent, and neighborhood literatures by examining understudied aspects of schools and neighborhoods. Findings suggest that the relation between context, identity, and development is more nuanced than is often assumed, with policy implications for how schools and neighborhoods can better address rising demographic diversity and persistent inequality.

Invasive species are rapidly expanding in riparian wetlands while concurrently anthropogenic causes are increasing nitrogen (N) into these ecosystems. Microstegium vimineum (Microstegium) is a particularly abundant invasive grass in the Southeast United States. To evaluate impacts of Microstegium on both plant diversity and N cycling in a riparian floodplain, paired plots of Microstegium hand-weeded and unweeded were established for three years. Plots without Microstegium increased from 4 to 15 species m-2 and 90% of the newly establishing species were native. The Microstegium community accumulated approximately half the annual N in biomass of the diverse community, 5.04 versus 9.36 g-N m-2 year-1, respectively (p=0.05). Decomposition and release of N from Microstegium detritus was much less than in the diverse community, 1.19 versus 5.24 g-N m-2 year-1. Rates of soil N mineralization estimated by in-situ incubations were relatively similar in all plots. While Microstegium invasion appears to greatly diminish within-ecosystem circulation of N through the under-story plants, it might increase ecosystem N losses through enhanced denitrification (due to lower redox potentials under Microstegium plots). Microstegium removal ceased in the fourth growing season and formerly weeded plots increased to 59% (± 11% SE) Microstegium cover and species richness decreased to <8 species m-2.

To learn how Microstegium responds to increased N, we conducted a greenhouse competition experiment between Microstegium and four native plants across an N gradient. There was a unique competition outcome in each species combination, yet Microstegium was most dominant in the high levels of N.

Last, we disturbed a floodplain similar to wetland restoration disturbance and tracked available N. We also established a native community of plants with and without Microstegium in three levels of N. Disturbance to the floodplain dramatically increased inorganic N, especially in the form of NO₃ which was five times higher in the disturbed floodplain than the undisturbed floodplain. N levels remained elevated for over a year. Microstegium was N responsive, but did not show negative effects to the planted vegetation until the second year. Ironically, restoration activities are increasing available N, and favoring invasive species which in turn detracts from restoration success.

Microbial communities associated with animals and plants (i.e., microbiomes) are implicated in the day-to-day functioning of their hosts, and there has been an explosion of research on them. Much of this research has focused on surveys of microbial diversities across a variety of host species, including humans, with a view to understanding how these microbiomes are distributed across space and time, and how they correlate with host health, disease, phenotype, physiology and ecology. Fewer studies have focused on how these host-microbiome associations evolve. In this dissertation, we develop a computational agent-based frameworks for modelling the long-term evolution and short-term dynamics of microbiomes within a population of hosts. Our frameworks allow different ecological processes and evolutionary forces to directly or indirectly affect microbiome composition. By incorporating a Wright-Fisher or Moran genealogical population model, we combine host phylogeny with microbiome assembly to consider the shared evolutionary history between hosts and their microbes. We also incorporate how hosts acquire their microbiomes, and how the environmental microbial community available to the hosts is assembled under both neutrality and selection. Under the selective models, we allow selection to operate on both microbes and hosts and observe how microbial diversities are gradually shaped by this evolutionary feedback between hosts and microbes. Furthermore, host population division and dispersal limitation are taken into account for our short-term neutral models. Our results indicate that the extent of parental contribution to microbial availability from one generation to the next significantly impacts the diversity of microbiomes over both long-term and short-term periods: with greater parental contribution, microbiome diversity within hosts tends to decline while microbiome diversity between hosts tends to increase. We also show that the implementation of selection further depresses microbial diversities and the comparison between host level and microbe level selection suggest that the evolutionary pressures directly acting on microbes is more dominant in shaping microbial diversity patterns. Finally, we show that host population division and dispersal limitation under high host contribution further shape the diversity patterns by elevating microbiome differences between hosts and depressing microbial diversity within hosts.

The Piedmont region of the southeastern United States has undergone considerable land-use change since settlement by Europeans and Africans. Forests were cleared for agriculture, followed centuries later by land abandonment. Following abandonment, natural recruitment, plantings for erosion control, and plantation forestry have resulted in a large area of the region covered by loblolly pine, Pinus taeda. Today, the Piedmont is a mosaic of farm fields, pastures, pine forests, and relic woodlots. The Calhoun Experimental Forest, located in Union County, SC, has provided a unique history of land use change's alteration of soil properties and processes, the ability of reforestation to restore or deplete soil fertility, and provided insights into the effects this change has on biological diversity.

In this work, the diversity of fungi living in soil is examined in the context of land-use change and soil biogeochemical change in and around the Calhoun Forest. This study uses molecular tools to identify fungal species from soil and to identify mycorrhizal associates of loblolly pine in a bioassay of propagule diversity, and proposes a novel use of quantitative PCR to quantify the relative abundance of major fungal families affected by land-use change.

Fungal diversity in soils is high in all land uses, but fungal communities shift from agricultural field communities largely comprised of unicellular ascomycetes and basal lineages to forest communities dominated by saprophytic and symbiotic basidiomycetes. In addition to this shift across a land use gradient, fungal communities are also responding to changes in carbon quantity and quality, biologically available nitrogen and phosphorus, pH, acidity and texture.

ECM propagule communities also differ across a land use gradient of cultivated fields, grasslands, pine forests, and mixed hardwood stands. There are few ECM propagules able to associate with loblolly pine in cultivated and grassland soils. There is a trend towards higher ECM diversity in the hardwood and pine soils, and both of those soil communities are distinct from each other as well as from soils from field treatments.

Quantitative PCR, coupled with a nested set of taxon-specific, fungal primers, is a potential way to estimate the abundance of the given taxon relative to all fungi in an environmental DNA. Primers specific to several taxonomic level of fungi were tested to confirm amplification in PCR, then were tested for taxonomic specificity by generating clone libraries with environmental DNA. Several of the successful primers were tested with soil DNA extracts in QPCR and the calculated ratios of fungal abundance varied widely by method of analysis. The results suggest that many repeated measurements and many replicates are required for a robust estimate of the relative abundance of a specific taxon.

Genetic diversity, population structure, and connectivity influence interactions among communities and populations. At hydrothermal vents in the western pacific, population structure in vent-associated species could occur at spatial scales ranging from vent sites separated by a few hundred meters to oceanic basins separated by more than 3000 kilometers. The spatial scale of population structure has important conservation implications; species that are well-connected across large geographic regions are more resilient to natural and anthropogenic disturbance. This dissertation examines the genetic diversity, population structure, and connectivity of 3 vent-associated species in the western Pacific. It first presents results from the development of microsatellite primers for Ifremeria nautilei, a deep-sea vent associated snail, then uses mitochondrial COI sequences and a suite of microsatellite markers to examine the broader connectivity of three vent-associated species, Ifremeria nautilei, Chorocaris sp. 2, and Olgasolaris tollmanni, across three back-arc basins in the western Pacific.

Within Manus Basin, no significant genetic differentiation was detected in populations of Ifremeria nautilei (based on COI and microsatellite), Chorocaris sp. 2 (based on COI and microsatellite), or Olgasolaris tollmanni (based on COI). A previously documented low-abundance cryptic species, Chorocaris sp. 1, was detected from a single site, South Su (based on COI). The population of I. nautilei in Manus Basin was found to be significantly differentiated from a second population that appeared to be panmictic across North Fiji and Lau Basin (based on COI and microsatellites). Chorocaris sp. 2 was also found to be significantly differentiated between Manus and North Fiji Basin (based on COI). Both I. nautilei and Chorocaris sp. 2 showed signs of potential low-level migration between Manus and other southwestern Pacific basins. O. tollmanni was undifferentiated between Manus and Lau Basin (based on COI). It is likely that a variable impedance filter exists that limits the realized dispersal of some, but not all species between Manus Basin and other western Pacific back-arc basins. The presence of a variable filter has implications for the conservation and management of hydrothermal vents in Manus Basin, as it is unclear what effects sustained anthropogenic disturbance will have on isolated populations of I. nautilei and Chorocaris sp. 2.

My dissertation identifies and deconstructs the interracial codes of conduct produced and enacted by three distinct racial-ethnic communities in an integrated neighborhood. My analysis of Creekridge Park is based on data collected via in-depth interviews, a neighborhood survey, and participant observation. By addressing the particularities of an integrated neighborhood, this project augments traditional index-based studies of segregation research and examines how the concept of social distance can explain the quantity and quality of encounters between Black, White, and Latino/a residents. I also evaluate the social environment of an integrated neighborhood by documenting and questioning the attitudes, behaviors, and relationships of neighborhood residents. Finally, I analyze the data using modified grounded theory, an iterative process that uses data and existing theory to develop conceptual models. Overall, this project emphasizes the importance of race as a social marker of status, privilege, and marginalization; the limits of diversity as an emancipating ideology; and the importance of power as a conceptual tool in analyses of White and nonwhite experiences in integrated settings.

Electroencephalography (EEG), a neuroscience method which requires sustained access to the scalp and hair, has many clinical and research applications. It is an essential feature of the rapidly growing consumer neurotechnology market. Neuroethicists have criticized EEG for being unaccommodating to phenotypic differences in hair type - a flaw which contributes to the systematic exclusion of minority groups from research. This exclusion legitimizes concerns about the generalizability of EEG research and effectiveness of EEG-based technologies. The following report employs a review of the most current literature across neuroscience, ethics, and technology publication sources to demonstrate how exclusion EEG research creates gaps in theoretical knowledge that disproportionately impact minorities and have profound implications for medical and consumer products. This paper summarizes the many applications of EEG and examines the impact of exclusion on EEG-based research and technology development. It outlines the risks of maintaining exclusion and provides policy recommendations for how to mitigate those risks by prioritizing inclusion in research methods.

Abstract

It is commonly thought that eleven o’clock on Sunday morning is the most segregated hour in America. Race in America is a vitally important issue and is equally significant within the inner systems of American churches. This project considers what motivations can be embraced to move homogeneous churches toward racial diversity and specifically whether the prayer for unity in the body of Christ that Jesus prayed in John seventeen is compelling enough to initiate a transition from homogeneity to multiracial. This thesis addresses the questions: What societal barriers exist that prevent or inhibit racial diversity within the majority of American churches? Can we identify societal mandates with theological underpinnings that are adequate to overcome these barriers? What practical approaches can congregational leaders implement to create and sustain an intercultural, multiracial church? So, this project is both an expedition for understanding and a search for strategies that will give the most promising opportunity to produce a healthy multiracial local church. The research is primarily a literature review and will include existing literature regarding historical race relations, sociological implications of race, and segregation in American churches as well as personal experiences pastoring a multicultural church. Documented interviews and discussions from notable individuals about race, white privilege, and discrimination within the American church structures will be included in the inquiry. Ultimately, this thesis provides pastors, leaders, church planters, or leadership teams the tools necessary to navigate the challenges of forming a racially diverse church, understand the complexity of race relations in America, identify the needed motivation to persevere through the process of transforming a homogeneous church into a multicultural one, and acquire reliable action steps that if taken, will increase the likelihood of success. This project presents Jesus’ prayer for unity in John seventeen as a call to action and the research both affirms its validity and offers steps toward its fulfillment.

Although women’s underrepresentation in senior level positions in the workplace has multiple causes, women’s self-improvement or “empowerment” at work has recently attracted cultural attention as a solution. For example, the bestselling book “Lean In” states that women can tackle gender inequality themselves by overcoming the “internal barriers” (e.g., lack of confidence and ambition) that prevent success. I sought to explore the consequences of this type of women’s empowerment ideology. Study 1 found that perceptions of women’s ability to solve inequality were associated with attributions of women’s responsibility to do so. Studies 2, 3, and 5 experimentally manipulated exposure to women’s empowerment messages, finding that while such messages increase perceptions that women are empowered to solve workplace gender inequality, they also lead to attributions that women are more responsible both for creating and solving the problem. Study 4 found a similar pattern in the context of a specific workplace problem, and found that such messages also lead to a preference for interventions focused on changing women rather than changing the system. Study 5 documents the weakened effects of messages that explicitly explain that women’s “internal barriers” are the products of “external barriers” obstructing women’s progress. Study 6 found that women’s empowerment messages are not successful in helping women feel empowered, but rather make them feel more responsible for causing workplace gender inequality. Studies 7a and 7b suggest that these negative consequences go beyond women’s empowerment and also apply to empowerment of African Americans in the context of racial inequality. In sum, these findings suggest that self-improvement messages intended to empower women to take charge of gender inequality may also yield potentially harmful societal beliefs, and that the processes demonstrated with women’s empowerment messages may apply to other disadvantaged groups like African Americans.

Surveys taken within the last two years have indicated that the majority of Americans believe that race relations are getting worse. This is in stark contrast to what the election of Barack Obama as the 44th President of the United States seemed to signify. Numerous people, pundits, and papers hailed this political victory as evidence that the United States was now entering a post-racial period. Eight years later, however, after several racially charged tragedies, many Americans are now wondering if the country can ever heal from the wounds of its racial past. During the summer of 2016, churches and faith leaders across America struggled to respond to video footage of a series of police shootings of black men. Alton Sterling died in Baton Rouge, Louisiana, after an altercation with police officers. Within twenty-four hours, a Facebook live video showed Philando Castile (with his girlfriend and her four-year-old daughter in the car) dying from gun wounds once he alerted a police officer that he was legally carrying a gun. The next day, five police officers were gunned down at a peaceful protest in downtown Dallas. The trio of events led to socio-political uproar. The American Evangelical Church is unprepared for the current socio-political climate that is producing severe racial strife and tension in American society. Highly publicized killings of unarmed black people are an intense political issue for individuals and communities. These shootings cause considerable psychological distress in individuals and racial tension in communities and cities. The Evangelical Church is unprepared and thus vulnerable to division and strife within its own walls, is hindered in achieving and sustaining ethnic diversity, and typically does not provide a robust prophetic message of hope in the midst of socio-political despair. This thesis will employ qualitative research in the form of literature reviews. First, drawing from current sociological, psychological, and political research I will make the case that the church must take proactive measures to prepare for—using my own coined term—racialized storms. The church must prepare for these storms to reduce the severity and impact of these racially-charged events in their respective communities and cities. I intend to research and recommend strategies drawn from the academic and professional fields of climate change adaptation and natural hazard mitigation. These insights will be analyzed and synthesized with biblical data to create a framework that gives churches practical steps to prepare for and respond to racially charged events that cause upheaval and division in the socio-political landscape of our communities and cities.