Towards the conservation of bishop bonnet: Astrophytum myriostigma Autores: Donají López Flores*, María del Carmen Mandujano, Jordan Golubov Institución u organización de procedencia: Universidad Autónoma Metropolitana - Unidad Xochimilco, (UAM-X). Instituto de Ecología, Universidad Nacional Autónoma de México Resumen: Mainly due to its ornamental value, the Cactaceae family has undergone massive collection and illegal trade, especially those species that occur in the Chihuahuan Desert (Robbins 2003). Astrophytum myriostigma, who inhabits this desert and is endemic to Mexico, besides the overcollection, has faced disturbance of its habitat, which has affected the size of its populations. The species is classified as "threatened" under the Mexican Legislation (NOM-059-SEMARNAT-2010), and listed on Appendix II of Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). In order to assess the current status of two populations of A. myriostigma in San Luis Potosi, and its implications for conservation, demography through population projection matrices was analyzed, the degree of habitat disturbance was assessed, and were conducted numerical simulations on the matrices, to evaluate possible means of conserving. The rate of population growth (λ) at Rioverde is in numerical equilibrium (λ=0.989, CI=0.975-1.014), while Pozas de Santa Ana is declining (λ=0.886, CI=0.870-942), in addition to having a higher degree of habitat disturbance than Rioverde. The numerical simulations showed that the establishment is the most important demographic process for conservation of this species. In addition, the values of λ increased, provided that the mortality of individuals decreases almost 100%, when simulating a protection of adults of larger size, which are affected by external factors such as goats and illegal collection. Additionally, a population management through use of seeds appears to be a viable conservation strategy, carrying out ex situ propagation and reintroductions to the wild.