1,721,051 research outputs found
) from Magellan Strait, Chile
No full textOdontocete cetaceans, due to their size, abundance, and energetic requirements, consume large quantities of prey and may therefore have substantial influence on the structure and dynamics of ecosystems (Bowen 1997, Trites 2002). Studies on their trophic ecology are fundamental to understand the role and ecological niche of these organisms in marine food webs (Tollit et al. 2010). The false killer whale (Pseudorca crassidens) is a top predator inhabiting tropical and subtropical waters of both hemispheres (Jefferson et al. 1993), rarely recorded in cold waters at latitudes greater than 50° (Baird 2002)...Fil: Haro, Daniela. Universidad de Chile. Facultad de Ciencias. Laboratorio de Ecofisiología
; ChileFil: Riccialdelli, Luciana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Blank, Olivia. Clínica Veterinaria Timaukel; ChileFil: Matus, Ricardo. Centro de Rehabilitación de Aves Leñadura; ChileFil: Sabat, Pablo. Universidad de Chile. Facultad de Ciencias. Laboratorio de Ecofisiología; Chil
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
Sobreposición de nicho en truchas simpátricas introducidas en un río en la Patagonia austral: evidencia mediante análisis de contenido estomacal e isótopos estables
Get PDFWe used a combination of stomach content and stable isotope analyses to assess the trophic interactions and feeding habits of two different salmonid species, brown trout (Salmo trutta) and rainbow trout (Oncorhynchus mykiss) in the Serrano River (Magellan and the Chilean Antarctic Region). We found a high dietary niche overlap, which was supported by Schoener’s index and stable isotopes Bayesian ellipses. The diet was dominated by the amphipod Hyalella spp. in both species. Nonetheless, evidence suggests that O. mykiss has a more generalist feeding strategy than S. trutta. The dietary breadth indices and the isotopic niche area, which were broader for O. mykiss than S. trutta, supported this scenario. This study increases our understanding on the trophic relationships among these introduced trout cohabiting the river and their possible effects in freshwater ecosystems from southern Chile.Fil: Hune, Matias. Centro de Investigación Para la Conservación de Los Eco; ChileFil: Haro, Daniela. Universidad Santo Tomás (ust);Fil: Davis, Ernesto. Centro de Investigación Para la Conservación de Los Eco; ChileFil: Gutiérrez, David. No especifíca;Fil: Anderson, Christopher Brian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; ArgentinaFil: Sabat, Pablo. Universidad de Chile; Chil
How do ectotherms perform in cold environments? Physiological and life-history traits in an Andean viviparous lizard
Get PDFMaterial complementario: https://www.frontiersin.org/articles/10.3389/fevo.2022.974968/full#supplementary-materialBoth the mean and the variation in environmental temperature are increasing globally. Indeed, the predicted increases in temperature range from 2 to 4°C in the next 50 years. Ectotherms control body temperature by means of behavior selecting microsites with different temperatures, which makes them more susceptible to changes in climate. Nevertheless, lizards living in high mountain environments have developed several mechanisms to inhabit and colonize variable environments with extreme temperatures. These mechanisms include a high metabolism to be active at lower temperatures and viviparity to improve embryonic development. Despite behavioral thermoregulation acting as a buffer to changes in environmental temperature, other traits such as lifehistory traits may be less flexible. Consequently, in an attempt to understand how lizards cope with harsh habitats, we evaluated some physiological traits and responses of females of Liolaemus bellii from two contrasting slope sites with differences in environmental temperature and humidity, but at the same altitude in the southern Andes range. We collected pregnant females from opposite slopes and maintained them until parturition in a commongarden experiment. Females from the south-facing slope (S-slope) had higher preferred body temperature (Tpref) values before and after parturition and exhibited higher daily energy expenditure before parturition. Nevertheless, no difference in Tpref was shown by their offspring, suggesting a developmental plastic response or adaptation to lower environmental temperature. For instance, the higher metabolism during pregnancy could be associated with a shorter activity period on the snowy S-slope. Additionally, females from the S-slope had larger kidneys and gave birth later than N-slope females, likely due to developmental plasticity or genetic differentiation. How fixed these traits are, in individuals from the contrasting slopes, will determine the response capacity of the L. bellii population to climate change
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
- …
