No. 07: The Urban Food System of Mexico City, Mexico

This report provides an overview of Greater Mexico City and its food system. The city’s history, demographic characteristics, geography and economy are first discussed. The city’s urban food system and urban food security are then examined with a particular focus on formal and informal food retail, food expenditure patterns, and policies to combat hunger and food insecurity. Meeting the daily food demands of Mexico City’s over 20 million inhabitants requires the agricultural production of Mexico’s rural areas, its fishing industry and food imports. Food products arrive in the city from around the country in a combination of traditional and highly sophisticated modern systems of food supply and distribution. Structural changes in recent decades have led to modifications in the systems of supply, distribution and food consumption with vertically integrated companies now controlling aspects of the food chain. The system of supply and marketing of food products is also characterized by competition between public markets, large wholesale and retail companies, and neighbourhood convenience stores. While levels of household food insecurity (undernutrition) are lower than in other global cities of the South, Mexico City faces an epidemic of overnutrition, obesity and non-communicable diseases

Retrospective evaluation of whole exome and genome mutation calls in 746 cancer samples

Funder: NCI U24CA211006Abstract: The Cancer Genome Atlas (TCGA) and International Cancer Genome Consortium (ICGC) curated consensus somatic mutation calls using whole exome sequencing (WES) and whole genome sequencing (WGS), respectively. Here, as part of the ICGC/TCGA Pan-Cancer Analysis of Whole Genomes (PCAWG) Consortium, which aggregated whole genome sequencing data from 2,658 cancers across 38 tumour types, we compare WES and WGS side-by-side from 746 TCGA samples, finding that ~80% of mutations overlap in covered exonic regions. We estimate that low variant allele fraction (VAF < 15%) and clonal heterogeneity contribute up to 68% of private WGS mutations and 71% of private WES mutations. We observe that ~30% of private WGS mutations trace to mutations identified by a single variant caller in WES consensus efforts. WGS captures both ~50% more variation in exonic regions and un-observed mutations in loci with variable GC-content. Together, our analysis highlights technological divergences between two reproducible somatic variant detection efforts

Social Relations, Property and 'Peripheral' Informal Settlement: The Case of Ampliacion San Marcos, Mexico City

This article explores the complexities of informal urbanisation at the metropolitan periphery of Mexico City through a case study of Ampliacion San Marcos, a former agricultural area on the city's south-eastern periphery. While the physical annexation of small towns and their environs is a common feature of Mexico City's growth, the settlement of Ampliacion San Marcos is more accurately described as a two-pronged process involving the extension of a nearby pre-Hispanic town and the expansion of Mexico City itself. The case study shows that the rural periphery of Mexico City is no tabula rasa upon which urban growth simply 'takes place', rather, settlement processes are influenced by longstanding in situ social relations and practices related to property. The paper highlights the importance of considering the relationships among social relations, property and informal settlement for understanding the complexity of metropolitan growth and change in large cities such as Mexico City.

Shelter, location, and livelihoods: Exploring the linkages in Mexico City

For many low-income households in cities of the developing world, 'self-help' or informal housing provides not only their shelter, but also functions as a vital productive asset. The land accessible to the urban poor for informal housing, however, is often remotely located in the urban periphery. While providing access to shelter, such peripheral locations may undermine the potential of shelter to serve as a productive asset, especially for women whose mobility is constrained by their dual roles as care-givers and wage-earners. This research explores how location influences the potential of housing to serve as a productive asset in two informally settled communities in different parts of Mexico City. The paper argues that the 'right to shelter' associated with informal housing needs to be 'scaled-up' to include the 'right to the city' through closer consideration of the linkages among shelter, location, and livelihoods. Such a policy focus necessarily situates housing in a broader socio-spatial context and would serve to complement the prevailing emphasis on community or place-specific upgrading activities in informal or low-income settlements. Finally, the paper raises questions about the role of planning in improving the livelihood opportunities of lower-income households

The 'graying' of 'green' zones: Spatial governance and irregular settlement in Xochimilco, Mexico City

This article details the evolving social and spatial dynamics of a planning approach that is now being used to regulate irregular or informal settlements in the conservation zone of Xochimilco in the Federal District of Mexico City. As part of the elaboration of 'normative' planning policies and practices, this approach counts, maps and then classifies irregular settlements into different categories with distinct land-use regularization possibilities. These spatial calculations establish a continuum of 'gray' spaces, placing many settlements in a kind of planning limbo on so-called 'green' conservation land. The research suggests that these spatial calculations are now an important part of enacting land-use planning and presenting a useful 'technical' veneer through which the state negotiates competing claims to space. Based on a case study of an irregular settlement, the article examines how the state is implicated in the production and regulation of irregularity as part of a larger strategy of spatial governance. The research explores how planning 'knowledges' and 'techniques' help to create fragmented but 'governable' spaces that force communities to compete for land-use regularization. The analysis raises questions about the conception of informality as something that, among other things, simply takes place outside of the formal planning system

(Re)constructing Informality and “Doing Regularization” in the Conservation Zone of Mexico City

This paper examines the introduction of land-use planning requirements into the regularization process of informal settlements in areas designated as “conservation land” in Mexico City. Since 1997, the government has increasingly deployed digital technologies to map and track informal settlement in conservation land in order to select those eligible for reclassification as “residential land use”: a prerequisite for other stages in the regularization process, including property titling, access to urban services and subsidised loans for home improvements. We argue that the incorporation of land use planning into the discursive and material enactments of regularization continues to reproduce the social class divisions behind the otherwise rather tenuous distinction between formal and informal urban development. Although presented as a technical concern by planners, regularization remains embedded in political processes and outcomes, a characteristic long recognised in the abundant literature on the subject. What is new is the geo-referencing of informality as part of land use planning, as this alters the dynamics of regularization processes, now involving the everyday planning practices of local government. This experience thus suggests the need for re-conceptualising informality as a form of selective spatial regulation and governance integral to the planning and urban development process

HPC report no. 7 : household food security and access to medical care in Maputo, Mozambique

The paper focuses on food security as a predictor of household medical care access. In African cities rapid, and predominantly unplanned development has resulted in large informal settlements associated with widespread chronic poverty and ill-health. The paper assesses the relationship between household food security and access to medical care, with analysis of household survey data from Maputo. In addition to limited infrastructure access, households in the poor areas of Maputo face unpredictable or seasonal access to employment and high rates of food insecurity.Social Sciences and Humanities Research Council of Canada (SSHRC