Redes alimentarias alternativas de Medellín y el Oriente de Antioquia: espacios de construcción de confianza / Alternative Food Networks in Medellin and Eastern Antioquia: Building Spaces of Trust

Antecedentes: el abastecimiento de alimentos en las ciudades es mayoritariamente dirigido por empresas transnacionales; usa circuitos largos, estimula el uso de agroquímicos en la producción de alimentos y con frecuencia no genera precios justos. Estas características han llevado a la construcción de un sector alternativo que articule nuevos mecanismos de producción, distribución y consumo de alimentos. Objetivo: describir las principales características de las redes alimentarias alternativas de Medellín y la subregión Oriente del departamento de Antioquia, sus actores, procesos y relacionamiento entre productores, distribuidores y consumidores. Materiales y métodos: estudio cualitativo de casos colectivos; se entrevistaron personas relacionadas con 15 redes alimentarias alternativas, se realizaron entrevistas semiestructuradas, observación participante en espacios de distribución y no participante en zonas de producción. Resultados: se halló en estas iniciativas el cimiento de un sistema alimentario alternativo, fundamentado en la agroecología, el comercio justo y el consumo saludable. Al ser analizadas desde los constructos teóricos del capital social, se halló que estas redes trabajan por tender puentes entre productores y consumidores y reforzar lazos entre los primeros eslabones del sistema; sin embargo, un posicionamiento más fuerte requiere fortalecer la asociatividad. Conclusiones: el naciente sector alternativo representa una oportunidad para consolidar sistemas alimentarios que contribuyan a generar capital social como bien público colectivo

Background: Food supply in cities is largely managed by multinational companies using widespread systems, promoting the use of agrochemicals in food production, and generating unfair pricing and access. These factors have led to the creation of an alternative sector highlighting new mechanisms of production, distribution, and consumption of foods. Objective: Describe the principle characteristics of alternative food networks in Medellin and the eastern sub-region of the state of Antioquia, highlighting the actors, processes, and relationships among producers, distributors, and consumers of said food products. Materials and Methods: Qualitative collective case study in which the participants were selected for interviews given their ties to 15 alternative food networks and systems. Semi-structured interviews were conducted, as well as active observation in distribution areas and passive observation in production zones. Results: The basis for healthy food systems was found in these alternative initiatives, which are based on agro-ecology, fair trade, and healthy consumption and consumerism. When analyzed from the theoretical constructs of social capital, it's seen that these networks help build ties between producers and consumers, and reinforce the bonds between the first links of these systems; however, stronger positioning is needed to strengthen these association. Conclusions: The recent advent of alternative food systems represents an opportunity to consolidate food sectors that contribute to the generation of social capital for the collective good of the population.

Chironomidae feeding habits in different habitats from a Neotropical floodplain: exploring patterns in aquatic food webs / Hábitos alimentares de Chironomidae em diferentes habitats de uma planície de inundação Neotropical: explorando padrões em redes alimentares aquáticas

Abstract Ecological studies on food webs have considerably increased in recent decades, especially in aquatic communities. Because Chironomidae family are highly specious, occurring in almost all aquatic habitats is considered organisms-key to initiate studies on ecological relationships and trophic webs. We tested the hypothesis that the diversity of the morphospecies diet reflects differences on both the food items available among habitats and the preferences of larval feeding. We analyzed the gut content of the seven most abundant Chironomidae morphospecies of the different habitats from the Upper Paraná River. We categorized the food items found into algae, fungal spores, fragments of plants, algae and animal fragments and sponge spicules. We observed the algae predominance in the gut content of morphospecies from lakes. Considering the different regions from each lake, we registered the highest food abundance in the littoral regions in relation to the central regions. From the variety of feeding habits (number of item kinds), we classified Chironomus strenzkei, Tanytarsus sp.1, Procladius sp.1 as generalist morphospecies. We found a nested pattern between food items and Chironomidae morphospecies, where some items were common to all taxa (e.g., Bacillariophyceae algae, especially), while others were found in specific morphospecies (e.g., animals fragments found in Procladius sp.1). The algae represented the most percentage of gut contents of Chironomidae larvae. This was especially true for the individuals from littoral regions, which is probably due to the major densities of algae associated to macrophytes, which are abundant in these regions. Therefore, the feeding behavior of these morphospecies was generalist and not selective, depending only of the available resources.

Resumo Estudos sobre redes alimentares têm aumentado consideravelmente nas últimas décadas em pesquisas de ecologia, principalmente em comunidades aquáticas. Em função Família Chironomidae ser altamente especiosa, ocorrendo em quase todos os hábitats aquáticos, é considerada como organismos-chave para estudos preliminares sobre as relações ecológicas como redes tróficas. Nós testamos a hipótese de que a diversidade de dietas das morfoespécies reflete diferenças tanto na disponibilidade dos itens alimentares entre os hábitats analisados, quanto preferencias alimentares das larvas. Nós analisamos o conteúdo digestivo das sete morfoespécies mais abundantes de diferentes habitats da planície de inundação do alto rio Paraná. Nós categorizamos os itens alimentares encontrados como algas, esporos de fungos, fragmentos vegetais, fragmentos de algas ou de animais e espículas de esponjas. Nós observamos a predominância de algas no conteúdo digestivo das morfoespécies lacustres. Considerando as diferentes regiões de cada lagoa, nós registramos as maiores abundâncias de alimentos nas regiões litorâneas, quando comparadas com as regiões centrais. A partir da variedade de hábitos alimentares (número de tipos de itens), classificamos Chironomus strenzkei, Tanytarsus sp.1 e Procladius sp.1 como morfoespécies generalistas. Nós encontramos um padrão aninhado entre os itens alimentares e as morfoespécies de Chironomidae, onde alguns itens foram comuns a todos os táxons (por exemplo, algas da Classe Bacillariophyceae), enquanto outros foram encontrados em morfoespécies mais especificas (por exemplo, fragmentos de animais encontrados em Procladius sp.1). As algas representaram a maior porcentagem do conteúdo digestivo das larvas de Chironomidae. Este fato foi especialmente verdadeiro para os indivíduos das regiões litorâneas, o qual é devido, provavelmente, pelas maiores densidades de algas associadas à macrófitas, que são abundantes nessas regiões. Portanto, o comportamento alimentar dessas morfoespécies foi generalista e não seletivo, dependendo apenas dos recursos disponíveis.

From Dietary Guidelines to Dietary Guidance.

One challenge is to make food consumption healthful and sustainable. Tools to achieve this include science-based documented dietary advice (here: 'dietary guidelines'), and policy-based initiatives and legislation (here: 'dietary guidance'). These two scientific and political tools operate independently, which may be counterproductive, especially if the future gives rise to high-impact scenarios of food crisis. This paper analyses, based on empirical trend data, the potential of dietary guidelines and guidance, and provides suggestions for these to align. Trend-analyses and empirical data point out that dietary guidelines, although relevant, achieve limited uptake by the consumer. Scientists apparently lack the management tools and communication channels to effectively reach the consumer, and thus major changes are not expected. By contrast, emerging issues such as the obesogenic environment and climate change are likely to call for greater involvement of policy-makers. This paper therefore advocates alignment of science and food policy. First, dietary guidelines, used for individual health promoting purposes, should be calibrated on global considerations. Guidelines on red meat consumption are recommended, as red meat consumption is a burden on both health and sustainability. Second, dietary guidance, used for global health and sustainability promoting purposes, should be calibrated on empowering the individual. Guidance in creating self-sufficient local food networks is recommended, as self-sufficient local food networks address both health and sustainability.