The odorous house ant, Tapinoma sessile, is a widespread, common pest in North American residential areas, yet the understanding of how viral pathogens shape its behavior, management, and interactions with other insects remains limited. Over the course of my thesis, I characterized four novel viruses in T. sessile using metatranscriptomic analysis, investigated their infectivity, and explored how colony social organization influences viral infection patterns. Inoculation experiments confirmed active infection in T. sessile colonies, suggesting trophallaxis as a route for horizontal transmission. These viruses were prevalent in urban populations with polygyne, unicolonial traits, indicating a potential association between colony social structure, colony location, and virus presence and diversity. Additionally, common honey bee viruses including Deformed Wing Virus and Kashmir Bee Virus were detected in T. sessile colonies, with higher prevalence near beehives, indicating a route for virus spillover between the species. Furthermore, the impact of viral infection on foraging behavior was assessed, revealing altered activity and diet preferences in infected colonies and highlighting the need for modified control strategies. Finally, I explored virus transmission between T. sessile and associated arthropods and found shared viruses and active replication in arthropods within ant nests, indicating a novel case of virus spillover between ants and myrmecophiles. These findings offer insights into viral pathogen interactions within ant colonies, the influence of social organization on infection dynamics, and the potential for pathogen transmission between ants and associated arthropods and offer a deeper understanding of an important native ant species that may shape future pest management strategies. / Master of Science in Life Sciences / In my thesis research I studied the odorous house ant or sugar ant, a common pest in homes and businesses in North America, to understand how viral pathogens shape its behavior, management, and interactions with other insects. I discovered four new odorous house ant viruses infecting these ants using molecular analysis techniques and found that they can pass from ant to ant when they share food. Interestingly, these viruses were more common in urban ant colonies with multiple queens, suggesting a link between the ants' social structure and the viruses they carry. Additionally, I found viruses typically seen in honey bees in these ant colonies, especially when those colonies were close to beehives, indicating that the odorous house ant can pick up viruses from honey bees. Furthermore, I studied how these viruses affect ant behavior and found that infected ant colonies change their activity and food preferences. Lastly, I investigated if these viruses are able to jump from ants to other insects and found evidence that insects living in their nests shared the same or similar virus infections. These findings provide important insights into how viruses spread among ant colonies and nearby insects, how their social structure affects transmission of viruses, and how viruses can move between different species of insects. Understanding these interactions is crucial for developing better ways to control ant pests and for gaining a deeper understanding of this important native ant species.

Few studies have examined whether performance feedback on a given task can have implications for motivational processes on an altogether distinct task. The present study proposes and tests a model for motivational spillover in a goal-setting context. Participants (N = 201) were provided with goal-performance discrepancy feedback (GPD) on a creativity task (CT) and were subsequently asked to complete an unrelated stock-predicting task (SPT). Results indicate that GPD feedback on the CTs was positively associated with positive affect such that negative GPDs resulted in low levels of positive affect and positive GPDs resulted in high levels of positive affect. This positive affect was in turn positively related to self-efficacy for the SPT. Self-efficacy was positively associated with personal goals, and goals were positively related to performance on the SPT. These findings provide initial evidence for the occurrence of positive and negative motivational spillover in a natural performance setting. / Ph. D.

As pollinators bumble bees play the crucial role of contributing to propagation of flowering plants in favour of food production as well as biodiversity. Over the course of a few decades bumble bees have seen a remarkable decline, with contributing factors being climate change, pesticides and pathogens such as viruses and parasites. In Sweden, commercially reared bumble bees are bought for the purpose of pollination in fruit and berry plantations. However, these reared bumble bees are a suspected contributor to a spillover of pathogens to wild bees in the same area. The aim of the study was to determine the prevalence of five viruses and five parasites in wild bumble bees nearby commercially reared bumble bees and to determine seasonal variation in pathogen distribution. qPCR was used for analysis of Acute bee paralysis virus, Deformed wing virus, Slow bee paralysis virus, Black queen cell virus and Sacbrood virus as well as the parasites Crithidia bombi, Apicystis bombi, Nosema bombi, Sphaerularia bombi and Locustacarus buchneri. The results showed a statistically significant, 4,8 times higher prevalence of A. bombi nearby commercially reared bumble bees in greenhouses compared to control landscapes. The results were also compared to pathogen prevalences in bumble bees caught in June the same year, showing a significantly higher prevalence in a majority of the parasites. It also showed a decrease in all viruses except Black queen cell virus, where the decrease might be explained by RNA degradation.

Yes / Digital finance is playing an increasingly prominent role in economic development. This paper examines the impact of digital finance on industrial structure upgrading based on panel data from 289 Chinese prefecture-level cities from 2011 to 2020. The paper adopts fixed effects, mediating effects, and spatial econometric models and the findings are as follows. First, digital finance development significantly boosts industrial structure upgrading in Chinese cities. The evidence remains valid after various robustness tests. Second, digital finance and industrial structure upgrading exhibit positive spatial spillover effects. Third, digital finance indirectly affects industrial structure upgrading through innovation, entrepreneurship and the structure of household consumption channels. Fourth, the influence of digital finance is more significant in cities with more developed economies, less financialization and lower income inequality. Finally, among the sub-indicators of digital finance, the breadth of coverage plays the most significant role, inspiring policymakers and financial institutions to speed up the digitization infrastructure in backward areas. / This work was supported by the Natural Science Fund of Hunan Province (2022JJ40647).

Yes / Building on the perspectives of the theory of planned behaviour, behaviour spillover, and social bond, this study develops and tests an integrative framework that explores the linkages between hotel employees’ organisational commitment (OC) and pro-environmental behaviour in the home (PEBH) as key antecedents affecting their intention to adopt green practices in the workplace (IGPW). We further examine the moderating role played by green organisational climate (GOC). Empirical results from 407 Malaysian hotel employees show that employees’ PEBH enhances IGPW via attitude and perceived behavioural control (PBC); OC positively affects intention mediated only by attitude, and GOC strengthens the effect of OC on PBC. These findings provide novel evidence concerning the importance of the contextual and organisational environment in shaping employees’ green behaviour.

Given the barriers to national and global climate change regulations, what are the real, disclosure and spillover effects of subnational regulations? Using the staggered adoption of U.S. state-level greenhouse gas (GHG) regulations as a natural experiment, I find significant reductions in corporate GHG emissions in adopting states. Affected firms report more representative GHG emissions information and reduce GHG-related 10-K risk disclosures. Furthermore, I document large spillover reductions in GHG emissions for treated firms’ affiliated operations in non-adopting states. These findings suggest possible alternate pathways to reduce GHG emissions and improve GHG disclosure if national or global policy coordination is not possible. / 2026-05-20T00:00:00Z

Firms' operational restructuring involves information relevant to strategic choices as well as future demand and cost conditions. This study examines the relationship between peer firms' restructuring and a company's responsiveness to its growth opportunities. Peer firm restructuring can increase uncertainty with respect to a company's payoffs regarding its investment projects, leading to decreased responsiveness to growth opportunities. Using a large sample of public companies during 2006–2020, I find that peer firms' restructuring is negatively associated with the responsiveness of capital expenditures (Capex) to growth opportunities. The results suggest that peer firms' restructuring activities provide information about a company's investment projects above and beyond industry shocks reflected in changes in industry sales. Furthermore, these associations are moderated by industry competition. The negative effects of peer firms' restructuring on Capex sensitivity are the strongest in high-competition industries.

Yes / Health and care services for patients may improve or harm the wellbeing of their family carers. Formal consideration of these effects (also known as spillovers) in decision-making is advocated, but, to date, little is known about how they occur. This paper presents the first empirical study to determine the mechanisms by which health and care services affect family carers' wellbeing. The study focused on three major health conditions: dementia, stroke, and mental health. Focus groups and interviews were conducted with 49 purposefully sampled care professionals and family carers in the UK between December 2016 and September 2017. Transcripts were coded and analysed thematically, using descriptive accounts and an explanatory account. The analysis generated six over-arching mechanisms by which health and care services affect family carers' wellbeing, through: (i) information (degree to which service delivery informs and trains family carers); (ii) management of care (shifts of responsibility for care between formal and family sectors); (iii) patient outcomes (services changing patient outcomes); (iv) alienation (feelings of alienation or inclusion created by service delivery); (v) compliance (barriers to patients complying and engaging with services); and (vi) timing or location (changes in the timing or location of services). Each mechanism was associated with sub-themes relating to both positive and negative spillovers on the family carers. The six mechanisms can be summarised with the mnemonic ‘IMPACT’. The IMPACT mechanisms may be useful in designing and evaluating services to optimise the wellbeing of carers as well as patients. / Hareth Al-Janabi is funded by a National Institute for Health Research (NIHR) Career Development Fellowship (CDF-2015-08-025) for this research project. Mel Calvert is partially funded by the NIHR Birmingham Biomedical Research Centre and the NIHR Surgical Reconstruction and Microbiology Research Centre at the University Hospitals Birmingham NHS Foundation Trust and the University of Birmingham. This paper presents independent research funded by the National Institute for Health Research (NIHR).

Two studies explored individual difference moderators of spillover. Positive spillover occurs when one prosocial behavior leads to an increase in subsequent prosocial behavior, whereas negative spillover or moral licensing occurs when one prosocial behavior leads to a decrease in prosocial behaviors. The moderators of interest were internal motivation, external motivation, and preference for consistency. It was predicted that those who exhibit high external motivation would demonstrate negative spillover, those who exhibit internal motivation would demonstrate positive spillover, and those with high preference for consistency would demonstrate positive spillover. Although these moderation predictions were not supported, Study 1 replicated previous work demonstrating moral licensing, or negative spillover. Participants who completed an initial non-prejudiced act later donated less money to a charity supporting racial equality than participants in the neutral control condition. The results of Study 2 demonstrated positive spillover. Participants who completed an initial pro-environmental act were more likely to help a local environmental organization compared to those who completed a neutral initial task. Future research is needed to understand the cause of the differing results, including measuring potential mediators in future studies.

The purpose of this study was to predict the family resources that influence positive family-to-work spillover for women who are engaged in parent, partner, and paid employee roles. While much research examines the construct of work-family conflict, little examines the positive benefits for women participating in multiple roles. A conceptual framework for the study was obtained from Voydanoffs (2002) work applying ecological systems theory to the work-family interface. Several factors were hypothesized to predict positive family-to-work spillover for multiple role women, including: spousal support; perceived fairness in the division of housework and childcare; relative share of childcare and housework; and paid assistance with housework.<p>Data for this study was collected in a survey designed for a larger assessment of work, family, gender, and health in the Saskatoon area. The current study utilized data collected from women who met the following criteria: 1) spoke fluent English; 2) fell between the ages of 25 - 54 years; 3) were employed full-time or part-time; and 4) were the parent of at least one child under the age of 20 years. The dependent variable was a measure of positive family-to-work spillover. Independent variables included: spousal support; perceived fairness of the division of childcare; perceived fairness of the division of housework; relative of share of housework for respondents compared to ones partner; and paid assistance with housework. Control variables included income, presence of preschool children, number of children, educational attainment, and hours of paid employment. A sequential multiple regression was performed to predict positive family-to-work spillover from the independent variables. The final regression model predicting positive family-to-work spillover included three independent variables: 1) spousal support; 2) the perception of division of childcare as unfair to ones partner; and 3) relative share of housework for the respondent. Implications and limitations of these findings are discussed.