The benefits of biodiversity: Human-wildlife interactions in urban Guyana

Worldwide, human populations are growing, the climate is changing, and natural habitat is being converted to alternative land-uses. In particular, urbanisation has both positive and negative implications for society and biodiversity conservation. Within cities, there is increasing evidence that green (e.g. parks, gardens) and blue spaces (e.g. rivers, coast) can benefit human subjective wellbeing by restoring attentional fatigue and reducing stress, while also providing resources to support biodiversity. However, it remains unclear how biodiversity, and other specific features of urban green and blue spaces, enhance or detract from wellbeing. These details are crucial to informing land-use management and policy decisions in towns and cities. Much of the existing evidence originates from the global North, despite biodiversity loss, population growth, and urbanisation rates accelerating in the global South. Drawing on theories and methods from multiple disciplines, this thesis empirically explores relationships between green and blue spaces and human wellbeing in Georgetown, the capital city of Guyana. This biodiversity-rich country in northern South America has the highest rate of suicide worldwide and is poised to transform due to the discovery of vast quantities of off-shore oil. First, I expose a dose-response relationship between patterns of visitor use to urban green and blue spaces and experiential wellbeing, finding that age, safety concerns, and nature-relatedness dictate patterns of use. Second, I show that green and coastal blue spaces are important for bird diversity and human wellbeing respectively, although the two do not relate. Third, I assess how human perceptions of bird diversity, naturalness, sounds, and safety affect wellbeing, influenced by how restorative these spaces are perceived to be. Finally, I use participatory video to triangulate earlier findings, discovering that biodiversity provides a multisensory experience, with place attachment, personal insecurity, and cultural beliefs contributing to wellbeing in green and coastal blue space. This interdisciplinary thesis makes important empirical contributions to the field of biodiversity-wellbeing research, representing the first evidence gathered from neotropical South America. Overall, my results provide a valuable evidence-base to inform the development of interventions (e.g. targeted public health and educational campaigns) in biodiversity-rich cities like Georgetown. From a wider perspective, these findings could be harnessed by policy-makers striving to meet international targets on sustainability while maximising human quality of life at a national scale

Pathway of protection: Ethnic identity, self-esteem, and substance use among multiracial youth

Fifty percent of adolescents have tried an illicit drug and 70% have tried alcohol by the end of high school, with even higher rates among multiracial youth. Ethnic identity is a protective factor against substance use for minority groups. However, little is known about the mechanisms that facilitate its protective effects, and even less is known about this relationship for multiracial youth. The purpose of the present study was to examine the protective effect of ethnic identity on substance use and to determine whether this relationship operated indirectly through self-esteem, a strong predictor of substance use for among adolescent populations. Participants included 468 multiracial youth in grades six through 12 (53% female). The results found that ethnic identity was indeed related to substance use, partially through changes in self-esteem. Findings from this study contribute to our understanding and development of models of risk and protection for an understudied population

What can parents do? Examining the role of parental support on the negative relationship between racial discrimination, depression, and drug use among African American youth

African American youth who experience racial discrimination are at heightened risk to use drugs as a coping response to distress. Based on the buffer-stress hypothesis, we proposed that parental support would attenuate this effect. Participants were 1,521 African American youth between 4th and 12th grade. As hypothesized, a mediation pathway was observed between racial discrimination, depression symptoms, and drug use. This effect was observed for both genders, although the pathway was partially mediated for males. Additionally, as hypothesized, parental support buffered the negative effect of depression symptomatology on drug use as a consequence of discrimination. Our findings highlight the impact racial discrimination has on health outcomes for African American youth and the importance of managing youth's emotional responses to discrimination. Moreover, findings illuminate the protective role of supportive parenting within the risk model and should thus be considered as an important component within prevention programming for this population of youth

Peer victimization and substance use: Understanding the indirect effect of depressive symptomatology across gender

OBJECTIVE: Peer victimization in school is common, with emerging literature suggesting that it may also increase risk for substance abuse. Yet, little is known about the underlying mechanisms within this risk pathway. The objective of this study is to use a prospective 3-wave design to examine the mediating role of depressive symptomatology on the relationship between peer victimization and substance use, as well as examine if the pathway varies based on gender. METHOD: 801 youth between 6th and 12th grade completed surveys across three years, which included measures on school peer victimization, depression symptomatology and substance use. Models tested the mediational pathway between victimization, depressive symptoms, and substance use. Models were stratified by gender. RESULTS: Controlling for grade and the effect of each variable across waves, a significant indirect effect of peer victimization on substance use through depressive symptoms was found for females, with a non-significant indirect effect for males. CONCLUSION: Results suggest that female youth who are victimized by peers engage in substance use behaviors, at least in part, due to increases in depressive symptoms. Given its effect on depression, female victims may therefore benefit from coping skills training that targets emotion regulation and distress tolerance skills in order to combat increased risk for substance use behaviors as a coping response to their victimization. Further research is warranted to better understand the risk pathway for male youth who also experience peer victimization

Peer Victimization, Mood Symptoms, and Alcohol Use: Examining Effects Among Diverse High School Youth

Peer victimization is associated with alcohol use among adolescents. However, few studies have examined the mediating role of depression and anxiety, or differences by race. The current study examined the prospective relationship of peer victimization, depressive and anxiety symptoms, and alcohol use across two timeframes: 9th to 11th grade and 10th to 12th grade among African American and White youth. 2,202 high school youth (57.6% female) who identified as either African American (n=342, 15.2%) or White (n=1860, 82.6%) provided data on study variables. Path analysis among the overall sample indicated that anxiety symptoms was a significant mediator for both timeframes, with depressive symptoms mediating the pathway during the 10th to 12th grade timeframe. The findings were most consistent among White youth, with no significant indirect effects observed for African American youth. Thus, addressing depressive and anxiety symptoms may be effective targets to decrease alcohol use risk as a result of peer victimization among White youth. However, further research is needed to better understand risk models for peer victimization exposure on substance use outcomes among racial/ethnic minority youth

Examining the Protective Effect of Ethnic Identity on Drug Attitudes and Use Among a Diverse Youth Population

Ethnic identity is an important buffer against drug use among minority youth. However, limited work has examined pathways through which ethnic identity mitigates risk. School-aged youth (N = 34,708; 52 % female) of diverse backgrounds (i.e., African American (n = 5333), Asian (n = 392), Hispanic (n = 662), Multiracial (n = 2129), Native American (n = 474), and White (n = 25718) in grades 4–12 provided data on ethnic identity, drug attitudes, and drug use. After controlling for gender and grade, higher ethnic identity was associated with lower past month drug use for African American, Hispanic, and Multiracial youth. Conversely, high ethnic identity was associated with increased risk for White youth. An indirect pathway between ethnic identity, drug attitudes, and drug use was also found for African American, Hispanic, and Asian youth. Among White youth the path model was also significant, but in the opposite direction. These findings confirm the importance of ethnic identity for most minority youth. Further research is needed to better understand the association between ethnic identity and drug use for Multiracial and Hispanic youth, best ways to facilitate healthy ethnic identity development for minority youth, and how to moderate the risk of identity development for White youth

Could Nintendo’s Animal Crossing be a tool for conservation messaging?

1. The current extinction crisis demands worldwide commitment to conservation across all sectors of society. By transcending the traditional disciplinary boundaries, conservationists can reach new audiences to communicate pro-conservation knowledge, education, and awareness messages. 2. There are approximately 2.7 billion video-gamers worldwide, with millions more joining as a result of global lockdowns. In March 2020, Animal Crossing New Horizons was released by Nintendo, fast becoming the second-best selling video game ever in Japan, and selling over 26.4 million units worldwide. Unlike many popular video games, its unique premise involves players creating an island, growing vegetation, catching wildlife, and donating fossils and species to a museum. The game has been praised for its positivity, escapism, and measurable benefits to mental wellbeing. 3. Here, we articulate how different features of the game, including the islands, their biodiversity and inhabitants, encourage players to exhibit pro-conservation behaviours and attitudes (e.g. recycling litter, or planting a diversity of flowers), as well as improving players’ knowledge about the diversity of relatively little known taxa (marine and freshwater fishes and invertebrates). We also highlight where pitfalls exist (e.g. encouraging the collection of threatened species). We principally frame these discussions in the context of Japan's cultural relationship with the natural world, including its history of insect-collecting and its management of green spaces. We conclude by outlining some recommendations about potential improvements to future releases, or for similar games, that could further promote conservation messaging. 4. This perspective sheds light on the avenues through which Animal Crossing: New Horizons encourages pro-conservation knowledge, attitudes, and behaviours of its international audience, with potential for these experiences to translate into real-world conservation actions. During a critical time in humanity’s history, video-gaming could therefore provide a huge opportunity for communicating conservation messages to billions of people worldwide

Baseline microbial characterizations of an imperiled aquatic diversity hotspot: Ash Meadows National Wildlife Refuge

Located in the discharge zone of the Death Valley Flow System, Ash Meadows National Wildlife Refuge is a spring-fed desert oasis and biodiversity hotspot about 90 miles northwest of Las Vegas. These critical wetlands are potentially threatened by groundwater pumping, exotic species invasions, and climate change. Although a major component of the lower food web, very little is known about the microbial makeup of this ecosystem. As a first step towards understanding the microbial and biogeochemical aspects of this system, a detailed molecular-based characterization of microbial communities, baseline chemistry, and physical characteristics of various springs of Ash Meadows will be conducted over the summer of 2009. Specifically, springs will be compared using DNA extraction followed by PCR amplification of the 16s rRNA gene, DNA fingerprinting, cultivation, and flow cytometric cell counting

Using Water Chemistry, Isotopes and Microbiology to Evaluate Groundwater Sources, Flow Paths and Geochemical Reactions in the Death Valley Flow System, USA

AbstractSprings of Ash Meadows and Furnace Creek (near or in Death Valley, CA) have nearly constant flow, temperature, chemistry, and similar δ2H and δ18O signatures. These factors indicate shared water sources and/or analogous geochemical reactions along similar flow paths. DNA-based (16S rRNA gene) microbial diversity assessments further illuminate these relationships. Whereas, all Ash Meadows springs share related archaeal populations, variations in carbon-14 (Crystal Spring) and strontium isotopes, Na+, SO2-, and methane concentrations (Big Spring), correspond with microbial differences within and between the two discharge areas. Similar geochemical signatures linking Ash Meadows and Furnace Creek springs appear to support a distinct end member at Big Spring in Ash Meadows, which is also supported by coincident enrichment in microbial methanogens and methanotrophs. Conversely, DNA libraries from a deep carbonate well (878 m) located between Ash Meadows and Furnace Creek (BLM-1), indicate no shared microbial diversity between Ash Meadows or Furnace Creek springs

AAPM medical physics practice guideline 10.a.: Scope of practice for clinical medical physics.

The American Association of Physicists in Medicine (AAPM) is a nonprofit professional society whose primary purposes are to advance the science, education, and professional practice of medical physics. The AAPM has more than 8000 members and is the principal organization of medical physicists in the United States. The AAPM will periodically define new practice guidelines for medical physics practice to help advance the science of medical physics and to improve the quality of service to patients throughout the United States. Existing medical physics practice guidelines will be reviewed for the purpose of revision or renewal, as appropriate, on their fifth anniversary or sooner. Each medical physics practice guideline (MPPG) represents a policy statement by the AAPM, has undergone a thorough consensus process in which it has been subjected to extensive review, and requires the approval of the Professional Council. The medical physics practice guidelines recognize that the safe and effective use of diagnostic and therapeutic radiation requires specific training, skills, and techniques as described in each document. As the review of the previous version of AAPM Professional Policy (PP)-17 (Scope of Practice) progressed, the writing group focused on one of the main goals: to have this document accepted by regulatory and accrediting bodies. After much discussion, it was decided that this goal would be better served through a MPPG. To further advance this goal, the text was updated to reflect the rationale and processes by which the activities in the scope of practice were identified and categorized. Lastly, the AAPM Professional Council believes that this document has benefitted from public comment which is part of the MPPG process but not the AAPM Professional Policy approval process. The following terms are used in the AAPM's MPPGs: Must and Must Not: Used to indicate that adherence to the recommendation is considered necessary to conform to this practice guideline. Should and Should Not: Used to indicate a prudent practice to which exceptions may occasionally be made in appropriate circumstances