Claudia Torres

Palm Management in South America

We reviewed information on management of useful palms in South America. We documented management for 96 species, from incidental activities intended to increase populations of wild palms to the inclusion of palms in complex agroforestry systems. Two species, Bactris gasipaes and Parajubaea cocoides, are domesticated. Managed species are remarkably fewer than species used in the region, which suggests that harvesters often disregard the fate of the species they use. The best way of managing palms is to employ harvest methods that do not decimate the populations. Although a variety of harvesting techniques have been documented, overharvest is common, and mismanagement prevails – unnecessary felling of palms in order to harvest leaves or fruits is a widespread practice. Research should focus on assessing production in response to management practices, but eradicating the habit of destructive harvest is an obvious priority. Research on palm management must be combined with actions addressed to all stakeholders of the palm/humans system.ResumenRevisamos la información sobre manejo de palmas útiles en Suramérica. Documentamos manejo para 96 especies, desde el cuidado ocasional de palmas con el fin de incrementar las poblaciones silvestres, hasta la introducción intencional de algunas especies en chagras o en sistemas agroforestales. Dos especies, Bactris gasipaes y Parajubaea cocoides, son domesticadas. Las especies manejadas son notablemente menos que las especies útiles, lo que refleja poco interés de los cosechadores por la suerte de las especies usadas. La mejor forma de manejar las palmas es emplear métodos de cosecha que no diezmen las poblaciones. Aunque se han documentado diversas técnicas de cosecha, la sobrecosecha es común y predomina el mal manejo: tumbar innecesariamente las palmas para cosechar las hojas o los frutos es una práctica común. La investigación debería enfocarse en evaluar la respuesta de las palmas a las prácticas de manejo, pero es prioritario erradicar las prácticas de cosecha destructiva. Se debe combinar la investigación sobre manejo de palmas con acciones dirigidas a todos los actores del sistema palma/hombre.

Exploring scenarios of chikungunya mitigation with a data-driven agent-based model of the 2014–2016 outbreak in Colombia

New epidemics of infectious diseases can emerge any time, as illustrated by the emergence of chikungunya virus (CHIKV) and Zika virus (ZIKV) in Latin America. During new epidemics, public health officials face difficult decisions regarding spatial targeting of interventions to optimally allocate limited resources. We used a large-scale, data-driven, agent-based simulation model (ABM) to explore CHIKV mitigation strategies, including strategies based on previous DENV outbreaks. Our model represents CHIKV transmission in a realistic population of Colombia with 45 million individuals in 10.6 million households, schools, and workplaces. Our model uses high-resolution probability maps for the occurrence of the Ae. aegypti mosquito vector to estimate mosquito density in Colombia. We found that vector control in all 521 municipalities with mosquito populations led to 402,940 fewer clinical cases of CHIKV compared to a baseline scenario without intervention. We also explored using data about previous dengue virus (DENV) epidemics to inform CHIKV mitigation strategies. Compared to the baseline scenario, 314,437 fewer cases occurred when we simulated vector control only in 301 municipalities that had previously reported DENV, illustrating the value of available data from previous outbreaks. When varying the implementation parameters for vector control, we found that faster implementation and scale-up of vector control led to the greatest proportionate reduction in cases. Using available data for epidemic simulations can strengthen decision making against new epidemic threats.