Carbamazepine and diclofenac: removal in wastewater treatment plants and occurrence in water bodies

In the aquatic environment, pharmaceuticals have been widely found. Among them, carbamazepine and diclofenac were detected at the highest frequency. To evaluate the worldwide environmental impacts of both drugs, their global consumption volumes are estimated, based on the dose per capita. The metabolites of these pharmaceuticals are also of environmental concerns, especially trans-10,11-dihydro-10,11- dihydroxycarbamazepine (CBZ-diol) which probably has a similar concentration in water bodies to that of its parent drug. The removal efficiencies and mechanisms of both drugs in the wastewater treatment plants (WWTPs) are discussed with the actual state of knowledge. The occurrences of both drugs are examined in various water bodies including WWTP effluents, surface waters, groundwater and drinking water. Their chemical, physical and pharmacological properties are also addressed in context, which can largely influence their environmental behaviors. The ecotoxicological studies of both drugs imply that they do not easily cause acute toxic effects at their environmental concentrations. However their chronic effects need cautious attention.     

A Theoretical Model of Food Citizenship for the Analysis of Social Praxis

Food citizenship is considered a helpful tool for extending the debate about the rights and duties of citizens to the field of food, and for fomenting participation of all actors in the governance of agri-food systems. Despite its generalized use, this concept has still to be systematically defined. The objective of this article is to apply the analytical framework of citizenship to the food dimension in order to identify the features which, from an analytical perspective, characterise food citizenship. By reviewing the available literature, we identify which are the constituent elements associated with the current concept of citizenship and we explore the treatment that different food theory approaches give to them. We also analyze what are the characteristics attributed to food citizenship by scholars and food movement practitioners. In addition, we propose a theoretical model of food citizenship structured into eight propositions. These propositions have as core ideas an extended concept of the right to food, the assumption of obligations, the combination of public and private behavior, the individual and collective participation, the empowerment of all actors of the agri-food system, the promotion of justice, fairness and sustainability in food systems, and a cosmopolitan character of food citizenship. The theoretical model of food citizenship we propose is a framework under construction, but we believe it to be a useful tool to stimulate theoretical debate about the concept, guide empirical research and foment citizen awareness about food issues.     

Human disturbance and shifts in vertebrate community composition in a biodiversity hotspot

Understanding how human modification of the landscape shapes vertebrate community composition is vital to understanding the current status and future trajectory of wildlife. Using a participatory approach, we deployed the largest camera-trap network in Mesoamerica to date to investigate how anthropogenic disturbance shapes the occupancy and co-occurrence of terrestrial vertebrate species in a tropical biodiversity hotspot: the Osa Peninsula, Costa Rica. We estimated species richness in different categories of land protection with rarefaction analysis and estimated the expected occupancy with a joint species distribution model that included covariates for anthropogenic disturbance, land protection, habitat quality, and habitat availability. Areas with the most stringent land-use protections (e.g., Corcovado National Park, 24 species [95% CI 23–25]) harbored significantly more species than unprotected areas (20 species [19.7–20.3]), mainly due to a reduced presence of large-bodied species of conservation concern in unprotected areas (e.g., jaguar Panthera onca and white-lipped peccary Tayassu pecari). Small-bodied generalist species, such as opossums (Didelphidae) and armadillos (Dasypus novemcinctus), in contrast, were more common at disturbed sites, resulting in a significant difference in vertebrate community composition between sites with low and high disturbance. Co-occurrence of species was also mainly associated with response to disturbance. Similar responses to disturbance create two groups of species, those whose site-level occupancy usually increased as anthropogenic disturbance increased and those whose estimated occupancy decreased. The absence of large-bodied species entails an important loss of ecological function in disturbed areas and can hinder forest development and maintenance. Efforts to protect and restore forested landscapes are likely having a positive effect on the abundance of some threatened species. These efforts, however, must be sustained and expanded to increase connectivity and ensure the long-term viability of the wildlife community.     

Sediments: sink,archive, and source of contaminants

Environmental Science and Pollution Research -