An exploratory spatial analysis of illegal coca cultivation in Colombia using local indicators of spatial association and socioecological variables

The cultivation of coca (Erythroxylon coca) by smallholders represents the first step in the world's largest illegal agribusiness: cocaine. The literature on illicit crops generally considers the global and national factors that influence its expansion but little attention is paid to the local conditions where cultivation takes place. This study analyzes the economic, environmental, institutional and social factors associated with the existence of coca crops within municipalities in two different years (2001 and 2008). We do this from a regional perspective, by taking into account the particular factors that characterize the areas associated with coca municipalities and estimating the impacts of coca cultivation on natural ecosystems. For the proposed analysis we use Exploratory Spatial Data Analysis (ESDA) to visualize and describe the local spatial distributions and clusters, implementing the Local Indicators of Spatial Association (LISA) for the year 2001 and 2008. Our results show that no individual factor is exclusively associated with the coca areas; in fact, a group of common factors characterizes these regions. The analysis indicates that the expansion of coca cultivation has produced a process of deforestation mainly affecting humid tropical forested ecosystems. (C) 2013 Elsevier Ltd. All rights reserved.