Dawn Biehler

Higher Mosquito Production in Low-Income Neighborhoods of Baltimore and Washington, DC: Understanding Ecological Drivers and Mosquito-Borne Disease Risk in Temperate Cities

Mosquito-vectored pathogens are responsible for devastating human diseases and are (re)emerging in many urban environments. Effective mosquito control in urban landscapes relies on improved understanding of the complex interactions between the ecological and social factors that define where mosquito populations can grow. We compared the density of mosquito habitat and pupae production across economically varying neighborhoods in two temperate U.S. cities (Baltimore, MD and Washington, DC). Seven species of mosquito larvae were recorded. The invasive Aedes albopictus was the only species found in all neighborhoods. Culex pipiens, a primary vector of West Nile virus (WNV), was most abundant in Baltimore, which also had more tire habitats. Both Culex and Aedes pupae were more likely to be sampled in neighborhoods categorized as being below median income level in each city and Aedes pupae density was also greater in container habitats found in these lower income neighborhoods. We infer that lower income residents may experience greater exposure to potential disease vectors and Baltimore residents specifically, were at greater risk of exposure to the predominant WNV vector. However, we also found that resident-reported mosquito nuisance was not correlated with our measured risk index, indicating a potentially important mismatch between motivation needed to engage participation in control efforts and the relative importance of control among neighborhoods.

The Great Indoors: Research frontiers on indoor environments as active political-ecological spaces

In this progress report we call for nature-society geographers to give greater attention to indoor environments as active political-ecological spaces. Nature-society geographers often treat such spaces as fixed and unnatural. Yet a growing body of research attests to the active role played by sites ranging from homes to factories to shopping malls in the production of nature, scale, and environmental citizens. Furthermore, environmentalist and public health projects have increasingly targeted indoor spaces for scrutiny and action, yet these projects and scientific literature typically lack a critical geographical perspective on scale, space, power, and nature. We argue that exploring indoor environments is necessary to fully encompass socio-natural assemblages that include flows of energy and knowledge, embodied subjects, technologies of power and resistance, and a variety of non-humans.

Socioeconomic status affects mosquito (Diptera: Culicidae) larval habitat type availability and infestation level.

ABSTRACT Mosquito populations are largely regulated by processes occurring at the larval stage. We sampled mosquito larval microhabitats (mostly water-holding containers) in six neighborhoods in the Washington, DC, area that varied in socioeconomic status (SES) and housing structure (row houses vs. stand-alone houses) to test associations among these neighborhood characteristics, microhabitat abundance and parameters, and mosquito occurrence and densities. Thirty-four percent (33.9%) of sampled microhabitats contained mosquito larvae, and 93.1% of larvae were Aedes albopictus Skuse or Culex pipiens L. Five specific container types (drains, corrugated flexible drainpipes, planters, garbage cans, and buckets) accounted for the majority of water-holding (56.0%) and mosquito-positive (50.6%) microhabitats sampled. We found no associations between SES or housing structure with total microhabitat abundance per yard, mosquito occurrence or mosquito densities per microhabitat. In contrast, container purpose varied with SES, with low SES neighborhoods having greater numbers of disused containers and lower numbers of functional containers than low and medium SES neighborhoods. Ae. albopictus were 83% more abundant in disused containers, whereas Cx. pipiens were more abundant in structural and functional containers, possibly owing to species-specific oviposition and development related to water quality. Ae. albopictus densities increased over the summer, whereas Cx. pipiens densities remained constant. Ae. albopictus is usually the dominant pest in urban areas in the eastern United States; therefore, integrated mosquito management programs should incorporate the elimination of disused containers to reduce its infestation and adult production, especially in low SES neighborhoods where they occur most frequently.

Effectiveness of Print Education at Reducing Urban Mosquito Infestation through Improved Resident-Based Management

Improving resident-based management and knowledge of mosquitoes is often an integral component of integrated mosquito management, especially in urban landscapes with considerable mosquito habitat on privately owned lands. This study tested the effectiveness of print education materials at reducing urban mosquito exposure through improving resident knowledge of, and attitudes towards, mosquitoes and mosquito management in Washington DC, USA. There was a specific focus on the removal of water-filled containers that are utilized by the developmental stages of the two most common vector species in the region, Aedes albopictus and Culex pipiens. Households in six neighborhoods that varied in socio-economic status were administered knowledge, attitude, and practice (KAP) surveys in 2010 and 2012, and had their yards surveyed for container habitats and immature mosquitoes (larvae and pupae) in 2010, 2011, and 2012. Half the households (intervention, n = 120) received education materials in 2011 and 2012 to yield a before-after control-intervention (BACI) design. Unexpectedly, residents in intervention households were more likely to show decreased concern for mosquito-borne illnesses than residents in control households, which did not receive materials. Moreover, there was a greater probability that control households reduced containers in 2012 than intervention households, particularly when they had low numbers of baseline (2010) containers. Irrespective of control, reductions in containers were associated with decreased abundances of immature mosquitoes. Overall, our findings suggest that print education materials may have unintended negative effects on resident attitudes and household management of mosquito production. We recommend that mosquito control agencies need to carefully consider their content of print messages and the effectiveness of strategies that passively convey information with little or no engagement with control professionals.

Socio-Ecological Mechanisms Supporting High Densities of Aedes albopictus (Diptera: Culicidae) in Baltimore, MD

Abstract Social, ecological, and climatic factors interact creating a heterogeneous matrix that determines the spatiotemporal distribution of mosquitoes and human risks of exposure to the diseases they transmit. We explore linkages between the social and institutional processes behind residential abandonment, urban ecology, and the interactions of socio-ecological processes with abiotic drivers of mosquito production. Specifically, we test the relative roles of infrastructure degradation and vegetation for explaining the presence of Aedes albopictus Skuse 1894 to better predict spatial heterogeneity in mosquito exposure risk within urban environments. We further examine how precipitation interacts with these socially underpinned biophysical variables. We use a hierarchical statistical modeling approach to assess how environmental and climatic conditions over 3 years influence mosquito ecology across a socioeconomic gradient in Baltimore, MD. We show that decaying infrastructure and vegetation are important determinants of Ae. albopictus infestation. We demonstrate that both precipitation and vegetation influence mosquito production in ways that are mediated by the level of infrastructural decay on a given block. Mosquitoes were more common on blocks with greater abandonment, but when precipitation was low, mosquitoes were more likely to be found in higher-income neighborhoods with managed container habitat. Likewise, although increased vegetation was a negative predictor of mosquito infestation, more vegetation on blocks with high abandonment was associated with the largest mosquito populations. These findings indicate that fine spatial scale modeling of mosquito habitat within urban areas is needed to more accurately target vector control.

Citizen science and civic ecology: merging paths to stewardship

Take Back the Block is a community beautification and citizen science program established for West Baltimore, Maryland (MD) residents. Citizen science, given its focus on data gathering, provides an ideal context to integrate adaptive management while encouraging locally based stewardship through civic ecology practices. The goal of this research is to show how integrating civic ecology practices with adaptive co-management of resources and citizen science can lead to meaningful environmental stewardship. We begin with a structured discussion comparing civic ecology to adaptive management and citizen science. We then share information about our civic ecology-oriented citizen science project that is both consistent with the ten principles of civic ecology practices and strives for adaptive co-management. In many ways, we found that our project aligned well with civic ecology practices with a few changes such as inviting members external to the community to participate and making data collection a component of the stewardship activities. Members of the project were able to achieve some stewardship goals in reclaiming and greening public spaces. In addition, in alignment with adaptive management, they iteratively gathered information that guided projects and serves as evidence and a model of adaptive co-management for communities outside of Baltimore.

Animacies: biopolitics, racial mattering, and queer affect

pesticide poisoning of workers and their communities. The volume is rich in ethnographic detail. The editor and a number of contributors state their open aim to encourage new research projects that make use of ethnographic methods to uncover the social relations that make up commodity chains. Indeed, they go further and generously offer to consult with new researchers. In Priti Ramamurthy’s chapter on the commodity chain and social relations implicit around the production and promotion of polyester saris or poonams in India, she offers a detailed how-to of feminist commodity chain methodology. Here, and elsewhere in the volume, the reader is reminded of an activist-researcher commitment that makes this a unique and valuable contribution. This is a powerful stand-alone contribution to a diverse range of disciplines: feminist geography; sociology; anthropology; development studies; international political economy; globalization studies; and labour studies; and will make a valuable contribution to teaching as a central text on graduate reading lists in any of these fields.