Opuntia in México: Identifying Priority Areas for Conserving Biodiversity in a Multi-Use Landscape

BACKGROUND: México is one of the world's centers of species diversity (richness) for Opuntia cacti. Yet, in spite of their economic and ecological importance, Opuntia species remain poorly studied and protected in México. Many of the species are sparsely but widely distributed across the landscape and are subject to a variety of human uses, so devising implementable conservation plans for them presents formidable difficulties. Multi-criteria analysis can be used to design a spatially coherent conservation area network while permitting sustainable human usage. METHODS AND FINDINGS: Species distribution models were created for 60 Opuntia species using MaxEnt. Targets of representation within conservation area networks were assigned at 100% for the geographically rarest species and 10% for the most common ones. Three different conservation plans were developed to represent the species within these networks using total area, shape, and connectivity as relevant criteria. Multi-criteria analysis and a metaheuristic adaptive tabu search algorithm were used to search for optimal solutions. The plans were built on the existing protected areas of México and prioritized additional areas for management for the persistence of Opuntia species. All plans required around one-third of México's total area to be prioritized for attention for Opuntia conservation, underscoring the implausibility of Opuntia conservation through traditional land reservation. Tabu search turned out to be both computationally tractable and easily implementable for search problems of this kind. CONCLUSIONS: Opuntia conservation in México require the management of large areas of land for multiple uses. The multi-criteria analyses identified priority areas and organized them in large contiguous blocks that can be effectively managed. A high level of connectivity was established among the prioritized areas resulting in the enhancement of possible modes of plant dispersal as well as only a small number of blocks that would be recommended for conservation management

Tuberculose vertebral (doença de Pott) associada a abscesso de psoas: relato de dois casos e revisão da literatura Spinal tuberculosis (Pott's disease) associated to psoas abscess: report of two cases and a literature review

A tuberculose é uma das principais doenças infecciosas de acometimento mundial com 3,9 milhões de casos notificados no mundo, em 2002. A forma esquelética pode corresponder a 3% do número total de casos, sendo 50% devido à tuberculose vertebral. O abscesso de psoas é uma entidade clínica rara com aproximadamente 12 casos relatados por ano na literatura médica e tem no Mycobacterium tuberculosis, um dos seus agentes etiológicos. O objetivo deste trabalho é relatar dois casos de tuberculose vertebral associada a abscesso de psoas atendidos em nosso serviço, bem como uma revisão da literatura.<br>Tuberculosis is one of the most important infectious disease worldwide, with 3,9 million reported cases in the world in 2002. The skeletal form is responsible for 3% of the total number of cases, with 50% of these due to spinal tuberculosis. The psoas abscess is a rare clinical entity with approximately 12 cases per year described in the medical literature and has in the Mycobacterium tuberculosis , one of its etiologic agents. The objective of this work is to report two cases of spinal tuberculosis associated with psoas abscess attended at our service, as well as a review of the literature