1,720,955 research outputs found
Estudio de los hábitos tróficos del delfín común (Delphinus delphis) a partir de ejemplares obtenidos en un varamiento masivo en el Golfo San Matías
Get PDFEl delfín común (Delphinus delphis) es el cetáceo pequeño más abundante del Golfo San Matías y su posición de depredador tope le otorga un rol clave como regulador de la estructura del ecosistema y sus relaciones tróficas. Un varamiento ocurrido en el mencionado golfo durante el mes de septiembre de 2021 permitió actualizar los conocimientos sobre la dieta y los hábitos alimenticios del delfín común, a partir de la identificación y descripción de la
composición de especies presa encontradas en 38 estómagos recuperados. Se calcularon diferentes índices descriptivos para evaluar la importancia relativa de las presas en la dieta y estimar la relación entre el tamaño, madurez y sexo de los delfines y el tamaño e identidad de sus presas. Luego, se comparó la dieta actual del delfín común con aquella estimada para el periodo 1999-2009 por Romero et al. (2012). En este estudio se describe por primera vez la
dieta de individuos de esta especie varados de manera simultánea en Argentina. El análisis de los datos obtenidos muestra una dieta dominada por presas pelágicas formadoras de cardúmenes, con Merluccius hubbsi y Engraulis anchoíta como presas principales, similar a la reportada en otras regiones costeras del mundo. Se detalló la relación entre las clases de madurez y sexo, y la dieta de la población estudiada, mostrando estrategias diferenciales entre
los grupos mencionados: los animales machos y maduros prefirieron a la merluza en su dieta, mientras que hembras e inmaduros a la anchoíta. Además, se observaron diferencias significativas entre la dieta descrita por Romero et al. (2012) y el presente estudio, lo que sugiere que los delfines comunes reflejan los cambios ocurridos en el ecosistema del Golfo San Matías reportados por diversos autores, por lo que podrían considerarse indicadores ambientales.The short beaked common dolphin (Delphinus delphis) is the most abundant small cetacean in the San Matías Gulf, and its position as apex predator gives it a key role as a regulator of ecosystem structure and trophic relationships. A mass stranding event occurred in the beforementioned gulf during September 2021 allowed us to update our knowledge on the diet and feeding habits of the common dolphin, based on the identification and description of the prey species composition found in 38 recovered stomachs. Different descriptive indices
were calculated to evaluate the relative importance of prey in the diet and estimate the relationship between the size, maturity, and sex of the dolphins and the size and identity of the consumed prey. The current estimated diet of the common dolphin was then compared with that estimated for the period 1999-2009 by Romero et al. (2012). This study describes for the first time the diet of individuals of this species stranded simultaneously in Argentina. Analysis
of the data reveals a diet dominated by schooling pelagic prey, with Merluccius hubbsi and Engraulis anchoíta as the main prey, similar to that reported in other coastal regions of the world. The relationship between maturity and sex classes and the diet of the studied population was detailed, revealing differential strategies among the groups: male and mature animals preferred hake in their diet, while females and immature animals chose anchovy. Furthermore,
significant differences were observed between the diet described by Romero et al. (2012) and the present study, suggesting that common dolphins reflect the changes occurred in the San Matías Gulf, previously reported by various authors and could therefore be considered environmental indicators.Fil: Mancuso, Matías. Universidad Nacional del Comahue. Facultad de Ciencias Marinas. Departamento de Ciencias Marinas; Argentina
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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