1,721,151 research outputs found
Abundance of copepods from multinet samples during POLARSTERN cruise ANT-XX/1, version 1
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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
Comparisons of seasonal trends between reef and offshore zooplankton communities in the northern Gulf of Aqaba (Red Sea)
No full textTrabajo final presentado por Manuel Olivares Requena para un Máster de la Christian-Albrechts-Universität zu Kiel, realizado bajo la dirección de la Dra. Astrid Cornils (AWI) y del Dr. Stefanie M.H. Ismar (GEOMAR).-- 48 pagesZooplankton plays a crucial role in the proper growth and development of reef-building corals under environmental stress, making the study of zooplankton communities particularly important in areas such as the Gulf of Aqaba (Red Sea) where corals show a great potential to cope with climate change factors. In the present study, reef zooplankton communities (>200 µm) were characterized in the northern Gulf of Aqaba, and compared to epipelagic offshore communities in order to find out whether a distinct reef community exists despite the short distance between coastal and offshore regions. Seasonal, spatial and diel patterns in terms of species composition, abundance, biomass, and C:N ratios of mesozooplankton communities were investigated at two different stations: one above the reef and one in offshore waters. There was special focus on the copepod community due to its great contribution within the mesozooplankton community. The results showed that the species composition, abundance, and biomass of reef and offshore communities were not significantly different, suggesting that the high proximity and the water exchange between both offshore and coastal areas do not allow distinguishing a distinct reef community. However, a few spatial differences were identified, i. e. the abundance of chaetognaths and the richness of copepod families were higher at the offshore station. The species composition of both communities was typical for tropical and subtropical seas, characterized by the high dominance of copepods (especially small calanoids), followed by mollusc larvae, appendicularians, and chaetognaths. However, the range of zooplankton abundance and the two-peak annual cycle of zooplankton abundance and biomass were more characteristic for temperate waters. No significant differences were found between day and night communities, except for some specific taxa such as chaetognaths, euphausiids, and decapods, which were more abundant at night. The match between environmental and biological patterns was weak, suggesting that the time resolution and the taxonomic resolution in the present study did not allow establishing significant correlations between environmental and biological parameters. C:N ratios of copepods were significantly higher at the reef across different taxa and seasons, which constitutes a proof of the importance of reef-building corals to provide C-rich material to the water columnPeer reviewe
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
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