Small-fragment, high turnover: soil microenvironment fluctuation effect on tree diversity in a Neotropical montane oak forest

Background Soil microenvironmental variables showed an important key in α and β-tree diversity in Neotropical montane oak forest. Thus, understanding the microenvironment fluctuation at small-fragment effects on tree diversity is crucial in maintaining the montane oak ecosystems. In this study, we hypothesized that within a relatively small-fragment (151.63 ha), tree α and β-diversity fluctuate and specific soil microenvironmental factors could influence tree species diversity to answer three questions: Do tree α and β-diversity differ among transects, even in a short-distance between them? Do microenvironmental variables influence tree diversity composition that occurs within a relict Neotropical montane oak forest? Is there a particular microenvironmental variable influencing tree species-specific? Methods We established four permanent transects during a year in a relict Neotropical montane oak forest, we assessed tree diversity and specific microenvironmental variables (soil moisture, soil temperature, pH, depth litterfall and light incidence). This allowed us to evaluate how microenvironmental variables at small-fragment influence α and β-tree diversity and tree species-specific. Results Our results showed that α-diversity was not different among transects; however, β-diversity of tree species was mostly explained by turnover and soil moisture, soil temperature, and light incidence were the microenvironmental variables that triggered the replacement (i.e., one species by another). Those variables also had effect on tree species-specific: Mexican beech (Fagus mexicana), Quebracho (Quercus delgadoana), Pezma (Cyathea fulva), Aguacatillo (Beilschmiedia mexicana), Pezma (Dicksonia sellowiana var. arachneosa), and Mountain magnolia (Magnolia schiedeana). Discussion Our results confirm our hypothesis related to β-diversity but not with α-diversity; however, the tree community structure of the diversity was similar among transects. Our study represents the first effort to evaluate and link the soil microenvironmental effect on tree α and β-diversity, finding a high replacement in a small-fragment of Neotropical montane oak forest from eastern Mexico

Kazual Basic, S.A. de C.V.

Seminario: planeación financiera de las empresa

Cuaderno de Problemas de Estadística

Cuaderno de problemas y prácticas de ordenador de las asignaturas de Estadística de los grados en Ingeniería impartidos en la Escuela Superior de Ingeniería de la Universidad de Cádiz.251 páginas. Documento en formato PDF

Conoce y aprende con Sierra Morena

Resumen basado en el del proyecto. Premiado en la convocatoria: Premios para proyectos de innovación concluidos durante el curso 2007-2008, en los centros educativos no universitarios sostenidos con fondos públicos de la Comunidad Autónoma de Castilla-La Mancha (Orden 12-12-2008, de la Consejería de Educación y Ciencia de la Junta de Comunidades de Castilla-La Mancha. Resolución de 5-5-2009, de la Viceconsejería de Educación)El proyecto se lleva a cabo en el CRA Sierra Morena, con los alumnos de Infantil y Primaria, y tiene como eje básico introducir a los niños en el Conocimiento del Medio cercano, como factor transversal de la experiencia, de una forma estructurada, mediante vivencias en el aula y en la naturaleza. Los contenidos se disponen en cuatro bloques: Geografía, Historia, Arte y Cultura, y Fauna y Vegetación. Los objetivos básicos que se persiguen son conocer el entorno de Sierra Morena y mejorar las competencias básicas a través de lo cercano. Como objetivos específicos se establecen: potenciar un nuevo estilo docente, permitiendo al profesorado disponer de recursos alternativos al libro de texto, ampliar las vías de acceso a la información y al conocimiento, así como valorar y planificar los contenidos procedimentales como base del trabajo de investigación y el espíritu crítico e innovador. Otro objetivo es desarrollar estrategias y habilidades de búsqueda de información que capaciten a los alumnos a investigar, innovar, aprender a aprender, aprovechar y compartir los recursos del entorno. Por último, fomentar el valor y el aprecio del entorno como lugar de aprendizaje, potenciando los medios disponibles para practicar actividades y juegos; espacio de encuentro de la Comunidad Educativa y herramienta de trabajo que resulte imprescindible para todas las áreas. Para su desarrollo se emplea un cuaderno didáctico, el cuaderno del alumno y una presentación Macromedia Flash Player. Se llevan a cabo marchas de senderismo con las distintas secciones del CRA a sitios cercanos de cada una de las localidades: Solana del Pino, Huertezuelas, El Hoyo y San Lorenzo de Calatrava.Castilla La ManchaConsejería de Educación, Ciencia y Cultura. Viceconsejería de Educación y Cultura. Servicio de Documentación; Bulevar del Río Alberche, s. n. - 1 Planta; 45071 Toledo; Tel. +34925286045; Fax +34925247410; [email protected]

Gender differences and management of stroke risk of nonvalvular atrial fibrillation in an upper middle-income country: Insights from the CARMEN-AF registry

Background: Atrial Fibrillation (AF) is associated with an increased risk of stroke and systemic embolism. Several studies have suggested that female AF patients could have a greater risk for stroke. There is scarce information about clinical characteristics and use of antithrombotic therapies in Latin American patients with nonvalvular AF. Objective: To describe the gender differences in clinical characteristics, thromboembolic risk, and antithrombotic therapy of patients with nonvalvular AF recruited in Mexico, an upper middle-income country, into the prospective national CARMEN-AF Registry. Methods: A total of 1423 consecutive patients, with at least one thromboembolic risk factor were enrolled in CARMEN-AF Registry during a three-year period (2014–2017). They were categorized according to Gender. Results: Overall, 48.6% were women, mean age 70 ± 12 years. Diabetes, smoking, alcoholism, non-ischemic cardiomyopathy, coronary artery disease, and obstructive sleep apnea were higher in men. Most women were found with paroxysmal AF (40.6%), and most men with permanent AF (44.0%). No gender differences were found in the use of vitamin K antagonists (VKA) (30.5% in women vs. 28.0% in men). No gender differences were found in the use of direct oral anticoagulants (DOAC) (33.8% women vs 35.4% men). Conclusions: CARMEN-AF Registry demonstrates that in Mexico, regardless of gender, a large proportion of patients remain undertreated. No gender differences were found in the use of VKA or DOAC. Keywords: Atrial fibrillation, Gender, Thromboembolic risk, Antithrombotic therapy, Stroke, Mexic

Compilación de Proyectos de Investigacion de 1984-2002

Instituto Politecnico Nacional. UPIICS