1,720,958 research outputs found
DISPERSIÓN, SUPERVIVENCIA Y REPRODUCCIÓN DE LA PAVA ALIBLANCA Penelope albipennis TACZANOWSKI, 1877 (CRACIDAE) REINTRODUCIDA A SU HÁBITAT NATURAL EN PERÚ
No full textLa pava aliblanca (Penelope albipennis) es un crácido endémico de los bosques secos del noroeste del Perú y se encuentra críticamente amenazado de extinción debido a la cacería y destrucción del hábitat. En el año 2000 se estableció el programa de reintroducción de esta especie. Este consistió en la liberación de individuos nacidos en cautiverio en el zoocriadero Barbara D’Achille en áreas donde la especie hubiera desaparecido con anterioridad y que en el presente aseguraran su conservación. Entre Septiembre de 2001 y Julio de 2003 fueron liberados un total de 20 pavas aliblancas en el Área de Conservación Privada Chaparrí, Lambayeque, Perú. La adaptación de las aves al lugar fue medida mediante su dispersión, supervivencia y reproducción. Se ha determinado en base a la distancia de dispersión, que es factible conectar la población reintroducida con las poblaciones silvestres aledañas. Con respecto a la supervivencia, evaluada a los dos años después de la liberación ha sido del 55%. En cuanto a la reproducción, se ha obtenido tres polluelos nacidos en libertad de padres reintroducidos
Efectividad de las acciones de conservación en la recuperación de las poblaciones de la pava aliblanca (Penelope albipennis) en el Perú
Get PDFUniversidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Conservación de Recursos ForestalesEl presente trabajo hace una recopilación y sistematización de la información acerca de la población y área de distribución de la Pava Aliblanca (Penelope albipennis), así como un análisis de las amenazas a las que la especie ha estado sometida. Se ha recopilado información desde su descripción en 1877 hasta la actualidad, en el año 2015. Con dicha información, se ha realizado un análisis de evaluación de riesgo de extinción según la Lista Roja de la Unión Internacional para la Conservación de la Naturaleza (IUCN), y se ha encontrado que la especie debería estar situada en la categoría En Peligro, en vez de En Peligro Crítico. Esto, debido al tamaño poblacional, el número de localidades en que se encuentra, tamaño del área de distribución y tendencia de la población. Este cambio de categoría se debería a una combinación de la efectividad de las acciones de conservación dirigidas a la especie durante los últimos 35 años, así como a un incremento del conocimiento relacionado a la distribución y población de la especie. Se hacen recomendaciones para continuar el trabajo de conservación de la especie y para monitorear su estado de conservación en los próximos años.The present work compiles and systematizes all the information about the White-winged Guan (Penelope albipennis) population and distribution, and makes an analysis of the threats to which the species has been subjected. Information has been collected from the species description in 1877 to the present, in the year 2015. With this information, an extinction risk assessment has been carried out according to the International Union for the Conservation of Nature (IUCN) Red List. It has been found that the species should be located in the endangered category, rather than Critically Endangered. This is due to the population size, the number of localities in which it is found, the size of the distribution area and the population trend. This change of category would be due to a combination of the effectiveness of the conservation actions directed to the species during the last 35 years, as well as to an increase of the knowledge related to the species distribution and population. Recommendations are made to continue the conservation work with the species and to monitor its conservation status in the coming years.Tesi
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
NESTING RECORDS OF THE TINY HAWK (ACCIPITER SUPERCILIOSUS) IN EASTERN PERU
Get PDFKnowledge about the breeding biology of the Tiny Hawk (Accipiter superciliosus) is scarce. Here we describe the discovery of two nests in the rainforest of eastern Peru. The first nest was detected during the incubation period (September 2018) at a height of 14 m above the ground on a branch bifurcation in a 20 m tall unidentified tree, at 525 m a. s. l. The second nest was detected during the fledging period (October 2020) and was located 16 m from the ground on the bifurcation of branches of a 20 m tall and 0.89 m DBH Flame tree (Erythrina velutina), at 1.070 m a. s. l. That nest had been built and occupied during the previous season by a pair of Plumbeous Kite (Ictinia plumbea). Both nests were located within remnants of secondary forest surrounded by currently or previously cultivated land. Observations are presented on the feeding behavior and nest defense
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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