Avifauna del Centro de Biotecnología Agropecuaria C.B.A

El libro presenta la Avifauna presente en la sabana de occidente en el área de influencia del Centro de Biotecnología agropecuaria en Mosquera Cundinamarca, el cual se presenta cómo un refugio de biodiversidad en el que se encuentran aves, mamíferos, anfibios y reptiles. Se presentan fichas con información detallada asociada a clasificación taxonómica, orden, familia, especie, origen, nombre común, descripción, hábitat y ecología, hábitos alimenticios, estado de conservación y distribución geográfica.The book presents the Avifauna present in the western savannah in the area of influence of the Center for Agricultural Biotechnology in Mosquera Cundinamarca, which is presented as a biodiversity refuge where birds, mammals, amphibians and reptiles are found. Cards are presented with detailed information associated with taxonomic classification, order, family, species, origin, common name, description, habitat and ecology, eating habits, conservation status and geographical distribution.Acerca del semillero de investigación -- Generalidades de las aves -- Taxonomía -- Anatomía -- Importancia cultural -- Buenas prácticas para la observación de aves -- Ética del buen observador de aves -- Normas de comportamiento -- Responsabilidad del guía -- Las aves en la sabana de occidente, área de influencia Centro de Biotecnología Agropecuaria -- Metodología -- Avifauna del Centro de Biotecnología Agropecuariana121 página

Evaluación en época seca de ecosistemas acuáticos y terrestres: componentes de vegetación y faunación. Sector Centro Administrativo PNN El Tuparro (Cumaribo, Vichada)

La asignatura Ecología Regional Continental tiene como objetivo el análisis de los procesos ecológicos a escala de paisaje y bioma. A lo largo de su existencia dentro del programa curricular de Biología de la Universidad Nacional de Colombia se han realizado distintos estudios ecológicos en distintas regiones del país, ampliando cada vez más el conocimiento de los estudiantes que toman la asignatura y aportando al conocimiento de zonas poco estudiadas. Durante los últimos periodos, la fase de campo se ha realizado en zonas pertenecientes al Sistema de Parques Nacionales Naturales de Colombia. Es así como se realizó un estudio preliminar durante el segundo semestre de 2010 en el PNN Cueva de Los Guacharos en el departamento del Huila, cumpliendo con el objetivo de una evaluación ecológica rápida a nivel de vegetación y limnología de manera dirigida, además de proyectos de distintos temas sobre aspectos ecológicos de la región. Para este periodo, primer semestre de 2011, la fase de campo se desarrolló en el PNN El Tuparro, ubicado en el departamento del Vichada y se incluyó adicionalmente el componente de faunación. Esta zona del país es poco conocida dado su difícil acceso, por lo que la información obtenida es de gran valor

A search for ultra-high-energy photons at the Pierre Auger Observatory exploiting air-shower universality

The Pierre Auger Observatory is the most sensitive detector to primary photons with energies above ∼0.2 EeV. It measures extensive air showers using a hybrid technique that combines a fluorescence detector (FD) with a ground array of particle detectors (SD). The signatures of a photon-induced air shower are a larger atmospheric depth at the shower maximum (X$_{max}$) and a steeper lateral distribution function, along with a lower number of muons with respect to the bulk of hadron-induced background. Using observables measured by the FD and SD, three photon searches in different energy bands are performed. In particular, between threshold energies of 1-10 EeV, a new analysis technique has been developed by combining the FD-based measurement of X$_{max}$ with the SD signal through a parameter related to its muon content, derived from the universality of the air showers. This technique has led to a better photon/hadron separation and, consequently, to a higher search sensitivity, resulting in a tighter upper limit than before. The outcome of this new analysis is presented here, along with previous results in the energy ranges below 1 EeV and above 10 EeV. From the data collected by the Pierre Auger Observatory in about 15 years of operation, the most stringent constraints on the fraction of photons in the cosmic flux are set over almost three decades in energy

Study on multi-ELVES in the Pierre Auger Observatory

Since 2013, the four sites of the Fluorescence Detector (FD) of the Pierre Auger Observatory record ELVES with a dedicated trigger. These UV light emissions are correlated to distant lightning strikes. The length of recorded traces has been increased from 100 μs (2013), to 300 μs (2014-16), to 900 μs (2017-present), to progressively extend the observation of the light emission towards the vertical of the causative lightning and beyond. A large fraction of the observed events shows double ELVES within the time window, and, in some cases, even more complex structures are observed. The nature of the multi-ELVES is not completely understood but may be related to the different types of lightning in which they are originated. For example, it is known that Narrow Bipolar Events can produce double ELVES, and Energetic In-cloud Pulses, occurring between the main negative and upper positive charge layer of clouds, can induce double and even quadruple ELVES in the ionosphere. This report shows the seasonal and daily dependence of the time gap, amplitude ratio, and correlation between the pulse widths of the peaks in a sample of 1000+ multi-ELVES events recorded during the period 2014-20. The events have been compared with data from other satellite and ground-based sensing devices to study the correlation of their properties with lightning observables such as altitude and polarity