1,720,978 research outputs found
Nuevos registros de Holochilus chacarius (Rodentia, Cricetidae) en la cuenca del río Carcarañá (Santa Fé, Argentina) y consideraciones biogeográficas
Get PDFThe collection and analysis of pellets is an adequate method in the study of small prey, because it allows the study of large areas, generates a large number and variety of individuals per lot. The order Strigiformes has the largest number of studies on the diet of birds of prey worldwide, highlighting those referring to Tyto furcata with a large number of contributions on the analysis of its regurgitates. The study of the regurgitations of this species has helped to make new interpretations about the distribution, taxonomy, and conservation of many species of rodents. Here, the presence of Holochilus chacarius is described in the south of the province of Santa Fe from the collection and analysis of pellets of the Barn Owl (Tyto furcata). These records expand the distribution of H. chacarius in the province and contribute to updating the existing distribution maps.La recolección y análisis de egagrópilas resulta un método adecuado en el estudio de presas pequeñas, debido a que permite el estudio de áreas extensas, genera gran cantidad y variedad de individuos por lote. El orden Strigiformes cuenta con el mayor número de estudios de dieta de aves rapaces a nivel mundial, destacándose los referidos a Tyto furcata con gran cantidad de contribuciones sobre el análisis de sus regurgitados. El estudio de las regurgitaciones de esta especie ha ayudado a realizar nuevas interpretaciones sobre la distribución, taxonomía y conservación de muchas especies de roedores. Aquí, se describe la presencia de Holochilus chacarius en el sur de la provincia de Santa Fe a partir de la recolección y análisis de egagrópilas de la lechuza del campanario (Tyto furcata). Estos registros amplían la distribución de H. chacarius en la provincia y contribuyen a actualizar los mapas de distribución existentes.Fil: Rimoldi, Pablo Guillermo. Universidad Nacional de Rosario. Facultad de Ciencias Veterinarias; Argentina. Universidad Nacional de Rosario. Facultad de Ciencias Agrarias; ArgentinaFil: Chimento, Nicolás Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin
Nuevo registro de Herpailurus yagouaroundi y actualización de su distribución en el sur de Santa Fe, República Argentina
Get PDFActualmente, los carnívoros enfrentan distintos problemas de conservación, derivados de la actividad humana, la pérdida de hábitat, la caza ilegal, la mortalidad por atropellamiento vehicular, entre otras. Herpailurus yagouaroundi (É. Geoffroy Saint-Hilaire, 1803) es una especie de gran plasticidadecológica y su distribución global abarca desde el sur de los Estados Unidos de América hasta el centro de la Argentina. En este trabajo se da a conocer un nuevo registro de H. yagouaroundi para el sur de la provincia de Santa Fe, y se recopilan registros previamente publicados por los autores para la zona. Estos registros amplían la geonemia de H. yagouaroundi en la provincia y contribuyen a actualizar los mapas de distribución recientemente publicados.Currently, carnivores face different conservation problems derived from human activity, habitat loss, illegal hunting, car-kills, among others. Herpailurus yagouaroundi (É. Geoffroy Saint-Hilaire, 1803) is a species of great ecological plasticity and its global distribution spans from the southern United States of America to central Argentina. In this work, one new record of H. yagouaroundi for southern Santa Fe province is presented. In addition, recently published reports by the authors are compiled. These records extend the distribution of H. yagouaroundi in the province, and contribute to updating the recently published distribution maps.Fil: Rimoldi, Pablo Guillermo. Universidad Nacional de Rosario; ArgentinaFil: Chimento, Nicolás Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin
New occurrence records of Chaetophractus villosus in the Carcarañá River basin, southern Santa Fe province, Argentina
Get PDFEn el presente trabajo se reportan 50 nuevos registros de Chaetophractus villosus para el sur de la provincia de Santa Fe (Argentina) y se los relaciona con algunas variables ambientales. La zona de estudio está ubicada en la cuenca del río Carcarañá, dentro de la región pampeana, uno de los ecosistemas naturales más modificados del mundo. Chaetophractus villosus, vulgarmente conocido como peludo, fue registrado en dos de las cuatro unidades ambientales muestreadas; 42 evidencias se encontraron en las tierras de cultivo y ocho en el bosque xerófilo. Existieron diferencias significativas en la cantidad de evidencias encontradas en la comparación entre estaciones del año y ambiente. La abundancia relativa entre los ambientes fue casi idéntica (tierras de cultivo: 0,17 rastros/km; bosque xerófilo: 0,16 rastros/km). Sin embargo, se pudo establecer un uso diferencial de los ambientes, encontrando registros del peludo en los bosques xerófilos sólo durante las estaciones otoño e invierno, lo que denota una importancia de las áreas forestadas como refugio cuando los campos agrícolas no tienen alta cobertura de vegetaciónWe report 50 new records of Chaetophractus villosus for southern Santa Fe Province (Argentina) and discuss their relationship with environmental variables. The study area is located in the Carcarañá River basin within the Pampean ecoregion, one of the most modified natural ecosystems in the world. The large hairy armadillo was recorded in two of the four environmental units sampled, with 42 records found in cropland and eight in dry woodland. The number of evidences varied between environments and seasons. The relative abundance was nearly identical in different environments (farmland: 0.17 tracks/km; dry woodland: 0.16 tracks/km). There was, however, a differential use of the environments. Records in the dry forests were limited to autumn and winter, which suggests that forested areas are important refuges for large hairy armadillos when farmlands lack high vegetation cover.Fil: Rimoldi, Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones Científicas y Transferencia de Tecnología A la Producción; ArgentinaFil: Abba, Agustin Manuel. Universidad Nacional de la Plata. Facultad de Ciencias Naturales y Museo. División Zoologia Invertebrados; Argentin
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
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
Record of four Felidae (Mammalia, Carnivora) species in an “espartillar” from the Río Carcarañá basin, Santa Fe, Argentina
Get PDFEn este trabajo se da a conocer la riqueza específica y abundancia relativa de felinos habitando un remanente de comunidades halófilas del tipo espartillar en la cuenca del río Carcarañá ((32°35’22”S - 61°50’37”O), provincia de Santa Fe, Argentina. La metodología utilizada consistió en el recorrido estandarizado de transectas lineales en busca de signos de actividad (heces, huellas y otras señales indirectas), observaciones directas, entrevistas y utilización de cámaras-trampa. A partir de los resultados obtenidos se pudo establecer el registro de cuatro especies de felinos (Puma concolor, Herpailurus yagouaroundi, Leopardus geoffroyi y Lynchailurus pajeros) y su asociación con distintas variables ambientales. Esta información permitió establecer a esta área como único lugar de la cuenca donde se registran las cuatro especies de Felidae aquí descriptas, motivo por el cual se convierte en un área de relevancia ecológica para futuros trabajos de investigación.In this work it is known the specific richness and relative abundance of felines inhabiting a remanent of halophilic communities of “espartillar” in the Carcarañá river basin (32°35’22”S - 61°50’37”W), province of Santa Fe, Argentina. The methodology used consisted of standardized walks of lineal transects looking for activity signals (faeces, tracks and other indirect signals), direct observations, interviews and trap cameras. With the results it was possible to establish register of four species of felines (Puma concolor, Herpailurus yagouaroundi, Leopardus geoffroyi y Lynchailurus pajeros) and their association with different environmental variations. Through this information this area was established as the only place in the basin where de former species of Felidae de ribed can be founded. Thus, the area is taken with ecological relevance for future works of investigation.Fil: Rimoldi, Pablo Guillermo. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; ArgentinaFil: Chimento, Nicolás Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales ; Argentin
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
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