1,720,958 research outputs found
Predation of the Peregrine Falcon (Falco peregrinus) on the Andean Swift (Aeronautes andecolus) in the Córdoba Mountains, Argentina
Full text linkEl Halcón Peregrino (Falco peregrinus) es un ave rapaz cosmopolita perteneciente al orden Falconiforme cuya ecología y dieta, relativamente bien conocidas, provienen de estudios realizados en la región neártica. Si bien se ha asociado a miembros de la familia Apodidae como parte de la dieta del Halcón Peregrino en otros países, en Argentina aún no existen registros que confirmen dicha interacción. El 22 de marzo de 2018, se observó un ejemplar de Halcón Peregrino capturando un individuo de Vencejo Blanco (Aeronautes andecolus) en la Reserva Privada Cerro Blanco, Córdoba, Argentina. Este reporte constituye el primer registro de depredación del Halcón Peregrino sobre el Vencejo Blanco para Córdoba y el país, abriendo nuevos interrogantes respecto a dicha interacción trófica y su efecto en la dinámica poblacional de ambas especies.The Peregrine Falcon (Falco peregrinus) is a cosmopolitan raptor belonging to the order Falconiforme. Their ecology and diet are relatively well known, but most of the knowledge on comes from studies carried out in the Nearctic region. Although members of the Apodidae family have been associated as part of the Peregrine Falcon?s diet in other countries, there are still no records confirming these interactions in Argentina. On the 22nd March 2018, a Peregrine Falcon was observed capturing an Andean Swift (Aeronautes andecolus) in the Cerro Blanco Private Reserve, Córdoba Province, Argentina. This report constitutes the first record of predation of the Peregrine Falcon on the Andean Swift for the province and for the entire country as well, opening new questions regarding this trophic interaction and its effect on the populations´ dynamics of both species.Fil: Merlo, Francis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Diversidad y Ecología Animal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Diversidad y Ecología Animal; ArgentinaFil: Merlo, Pablo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto de Biología de Organismos Marinos; Argentin
Fine-scale variation in the proximity of baited remote underwater video stations (BRUVS) to rocky reefs reveals changes in the structure of temperate fish assemblages
No full textWe investigated changes in the structure of coastal fish assemblages in Northern Patagonia, Southwestern Atlantic, by using baited remote underwater video stations (BRUVS) deployed at increasing distances from rocky reefs: 0–5 m, 15–20 m and 50–60 m. We estimated species richness and abundance (total and by preferred habitat type) and searched for diagnostic species in each distance range. We recorded 14 taxa across 11 families in 19 areas surveyed. Species richness and abundance were higher on reef ledges and decreased with distance from them, at a finer spatial scale than previously reported. Acanthistius patachonicus and Sebastes oculatus were indicative of reef ledges; they were less abundant at 15–20 m and disappeared at 50–60 m. Callorinchus callorynchus and Odontesthes spp. occurred only at distances >15–20 m from the reefs, while Galeorhinus galeus was distributed homogeneously throughout the surveyed area. Our findings have practical implications for monitoring ecotone demersal habitats with BRUVS.Fil: Merlo, Pablo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; ArgentinaFil: Venerus, Leonardo Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; ArgentinaFil: Irigoyen, Alejo Joaquin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentin
Alometría en peces: aplicación de un método para estimar tallas a partir de video
No full textEl monitoreo de peces mediante video remoto ganó popularidad en el ámbito científico debido a su relativo bajo costo, mínimo impacto ambiental y gran versatilidad. Sin embargo, la estimación de las tallas presenta dificultades dada la bidimensionalidad de las imágenes obtenidas, generando una imprecisa percepción de las distancias. Algunas soluciones consisten en la adición de referencias de tamaño conocido dentro del campo visual, lo que limita el número de individuos medidos con exactitud. Otras, utilizan sistemas precisos pero costosos con dos cámaras sincronizadas (estéreo-video). Recientemente se demostró que usando alometría (cambios en el tamaño relativo de algunas partes del cuerpo respecto del largo total) pueden obtenerse estimaciones exactas de tallas mediante video. El objetivo del trabajo fue calibrar un método descripto recientemente, que utiliza relaciones alométricas y video remoto, para estimar las tallas de las especies de peces óseos y condrictios del centro-norte de la Patagonia Argentina. Se registraron y fotografiaron ~700 individuos pertenecientes a 25 especies, capturados en torneos de pesca recreativa y en sesiones de pesca con devolución. Para cada ejemplar, se determinó la proporción altura de cabeza/diámetro del ojo (AC/DO) y se midió el largo total. Posteriormente, se ajustaron regresiones del AC/DO sobre la talla para todas las especies. En general, la bondad de ajuste (R2) fue mayor y el error relativo menor en especies asociadas a fondos duros, respecto de especies pelágicas o condrictios. Todavía se requieren pruebas aplicando las regresiones calibradas en muestreos con video para determinar la precisión y utilidad local del método.Fil: Merlo, Pablo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; ArgentinaFil: Venerus, Leonardo Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; ArgentinaFil: Bovcon, Nelson Darío. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Irigoyen, Alejo Joaquin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; ArgentinaXXIX Reunión Argentina de EcologíaTucumánArgentinaAsociación Argentina de Ecologí
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
- …
