1,721,078 research outputs found
A new gastropod associated with a deep-sea whale carcass from São Paulo Ridge, Southwest Atlantic
No full textHasegawa, Kazunori, Fujiwara, Yoshihiro, Okutani, Takashi, Sumida, Paulo Yukio Gomes, Kawato, Masaru, Kitazato, Hiroshi (2019): A new gastropod associated with a deep-sea whale carcass from São Paulo Ridge, Southwest Atlantic. Zootaxa 4568 (2): 347-356, DOI: 10.11646/zootaxa.4568.2.
Illustrated key for the identification of the known zoeal stages of brachyuran crabs (Crustacea: Decapoda) from tropical and subtropical Brazil, southwestern Atlantic
No full textKoettker, Andrea G., Sumida, Paulo Y. G., Lopes, Rubens M., Freire, Andrea S. (2012): Illustrated key for the identification of the known zoeal stages of brachyuran crabs (Crustacea: Decapoda) from tropical and subtropical Brazil, southwestern Atlantic. Zootaxa 3204 (1): 1-19, DOI: 10.11646/zootaxa.3204.1.1, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.3204.1.
FIGURE 1. A in A new gastropod associated with a deep-sea whale carcass from São Paulo Ridge, Southwest Atlantic
No full textFIGURE 1. A map showing the location of the deep-sea whale carcass at the São Paulo Ridge, where the present new species was collected.Published as part of Hasegawa, Kazunori, Fujiwara, Yoshihiro, Okutani, Takashi, Sumida, Paulo Yukio Gomes, Kawato, Masaru & Kitazato, Hiroshi, 2019, A new gastropod associated with a deep-sea whale carcass from São Paulo Ridge, Southwest Atlantic, pp. 347-356 in Zootaxa 4568 (2) on page 349, DOI: 10.11646/zootaxa.4568.2.9, http://zenodo.org/record/259951
FIGURE 4 in A new gastropod associated with a deep-sea whale carcass from São Paulo Ridge, Southwest Atlantic
No full textFIGURE 4. Radula and operculum of Rubyspira brasiliensis sp. nov., paratype #3, NSMT-Mo 78945, same specimen as the one illustrated in Figure 3. A. radula, a scanning electron micrograph. B: internal and external views of operculum. Scales: A = 100 µm; B = 1 mm.Published as part of Hasegawa, Kazunori, Fujiwara, Yoshihiro, Okutani, Takashi, Sumida, Paulo Yukio Gomes, Kawato, Masaru & Kitazato, Hiroshi, 2019, A new gastropod associated with a deep-sea whale carcass from São Paulo Ridge, Southwest Atlantic, pp. 347-356 in Zootaxa 4568 (2) on page 352, DOI: 10.11646/zootaxa.4568.2.9, http://zenodo.org/record/259951
Temporal changes in benthic megafaunal abundance and composition across the West Antarctic Peninsula shelf: results from video surveys
No full textThe West Antarctic Peninsula (WAP) shelf experiences intense seasonal and interannual variability in phytoplankton production and particulate-organic-carbon flux to the seafloor. To explore the response of the megabenthic community to this production variability, we conducted video surveys of epibenthic megafauna at three stations on the WAP shelf in Nov–Dec 1999, Mar 2000, Jun 2000, Oct–Nov 2000, and Feb–Mar 2001. The epibenthic megafauna was dominated (>90%) by elasipod holothurians, irregular urchins and anthozoans, with total abundances ranging from 19 to 152 ind. 100 m?2. The abundance of three of the dominant taxa (Protelpidia murrayi, Peniagone vignoni, and Amphipneustes spp.) varied significantly across seasons (p<0.05), although variations were not tightly correlated with the summer bloom cycle. The irregular urchins in the genus Amphipneustes varied 5-fold in abundance at single stations, with maximum densities (an average of 10.1 ind. 100 m?2) attained in Jun 2000. Abundances of the elasipod holothurians P. murrayi (1–121 ind. 100 m?2) and P. vignoni (0.7–27.5 ind. 100 m?2) fell within the range for elasipod holothurians from other bathyal regions measured using image analysis. The abundance of P. murrayi increased up to 6-fold from a single Jun–Oct recruitment pulse, while changes in the abundance of P. vignoni (over 2-fold higher in Feb–Mar 2001) apparently resulted from immigration during the presence of a 1–2 cm thick carpet of fresh phytodetritus. Based on the ratio of the number of fecal casts per individual, elasipod holothurians increased surface-deposit feeding rates by 2-fold while phytodetritus was present at the seafloor. Nonetheless, these surface-deposit feeders appeared to feed and egest sediments throughout the winter, which is consistent with year-round persistence of a labile food bank in surficial sediments on the deep WAP shelf.<br/
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
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