1,720,961 research outputs found
A new Tetranchyroderma species (Gastrotricha, Macrodasyida, Thaumastodermatidae) from the Canary Islands (Spain)
No full textShallow sublittoral sediment collected from Tenerife (Canary Islands, Spain) yielded several specimens of an undescribed thaumastodermatid gastrotrich species along with some specimens of Paraturbanella teissieri and one unidentifiable specimen belonging to the genus Crasiella. The paper deals with the description of Tetranchyroderma canariense sp. nov. The new species, which appears closely allied with T thysanogaster, Tetranchyroderma sp. 4 and Tetranchyroderma sp. 5 (Valbonesi & Luporini 1984), is characterized by: 1. a complete cuticular covering made up of tetrancres, that are larger on the head and rear trunk region; 2. caudal pedicles each made up of two adhesive tubes; 3. up to 10 anterior adhesive tubes; up to 20 ventrolateral adhesive tubes per side, and two clusters of ventral adhesive tubes of 4 tubes each, located in the posterior trunk region. This represents the first record of marine Gastrotricha from the Canary Archipelago and the second marine gastrotrich species from Spain
Diversity and dynamics of an interstitial Tardigrada population in the Meloria Shoals, Liguria Sea, with a redescription of Batellipes similis (Heterotardigrada, Batillipedidae)
No full textQuantitative samples of sediment for tbc study of the meiofauna were collected monthly beween March 1996 and February 1997 from a 7-m-deep site in tbc Meloria Shoals, Livorno Italy. In tbc Tuscan Shoals, 16 species of tardigrades were found belonging to tbc families Stygarctidae, Halechiniscidae, and Batillipedidac. Megastygarctides orbiculatus and Actinarctus doryPborus are reported for tbc first time in tbc Mediterranean Sea, and a redescription of Batillipes similis is proposed. Global density of . tbc Tardigrada population fluctuated between 8 ind./10 cm2 in May 1996 and 285 ind./10 cm2 in January 1997. The lowest valite of tbc Shannon-Wiener biodiversity index (H' = 1.09) was found in September 1996, whereas the highest score (H' = 2.46) was obtamed in March 1996. Pielou's evenness index (J) fluctuated between 0.40 and 0.88, values attamed in January 1997 and March 1996, respectively. The study confirms the notion that tbc organogenic detritus of the Shoals represents a very favourable environment for meiofauna) organisms in generai, and Tardigrada in particular
Prime osservazioni sul macrobentos (Echinodermi e Tunicati) e sul meiobentos delle isole Eolie. Caratterizzazione ambientale marina del sistema Eolie e dei bacini limitrofi di Cefalù e Gioia
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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
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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