1,720,978 research outputs found
Recognizing diversity in blennioid fish nomenclature (Teleostei: Blennioidei)
No full textHastings, Philip A., Springer, Victor G. (2009): Recognizing diversity in blennioid fish nomenclature (Teleostei: Blennioidei). Zootaxa 2120: 3-14, DOI: 10.5281/zenodo.18809
Ecsenius caeruliventris and E. shirleyae, two new species of blenniid fishes from Indonesia, and new distribution records for other species of Ecsenius
No full textSpringer, Victor G., Allen, Gerald R. (2004): Ecsenius caeruliventris and E. shirleyae, two new species of blenniid fishes from Indonesia, and new distribution records for other species of Ecsenius. Zootaxa 791: 1-12, DOI: 10.5281/zenodo.16963
FIGURE 3 in Ecsenius caeruliventris and E. shirleyae, two new species of blenniid fishes from Indonesia, and new distribution records for other species of Ecsenius
No full textFIGURE 3. Distribution of the Ecsenius species of the Prooculis group. Specimen from Kai Islands lost and unavailable for confirmation of identification.Published as part of Springer, Victor G. & Allen, Gerald R., 2004, Ecsenius caeruliventris and E. shirleyae, two new species of blenniid fishes from Indonesia, and new distribution records for other species of Ecsenius, pp. 1-12 in Zootaxa 791 on page 10, DOI: 10.5281/zenodo.16963
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
Chaenopsidae
No full textChaenopsidae 9) Stathmonotus. Stathmonotus stahli (Evermann & Marsh), was described based on specimens collected in Puerto Rico. Subsequently Stathmonotus tekla Nichols was described from Sand Key, Florida. Springer (1955) considered them subspecies and Hastings & Springer (1994) reported that they differ in number of segmented caudal-fin rays (11-13, modally 12 in stahli versus 10-12, modally 11 in tekla), number of dorsalfin spines (41-45, modally 43 in stahli versus 39-44, modally 42 in tekla) and number of precaudal vertebrae (17-19, modally 18 in stahli versus 16-19, modally 17 in tekla). These features reliably distinguish the forms and we consider them both as valid species. 10) Chaenopsis. Chaenopsis alepidota (Gilbert) was described based on specimens from the northern Gulf of California collected aboard the Albatross. Subsequently Chaenopsis alepidota californiensis Böhlke was described based on three specimens collected from Isla Catalina off the coast of southern California. The latter subspecies was recognized based primarily on its having more rays in the dorsal and anal fins (total for all elements 95-97, mean = 96 versus 89-94, mean = 91.3), although Böhlke concluded that it “seems that little differentiation has taken place” (Böhlke, 1957, p. 97). These meristic characters follow the expected patterns of phenotypic variation as a consequence of the significantly colder environmental temperatures experienced by the populations in California. As noted by Böhlke (1957), populations of species from colder areas generally have more fin-ray elements (Jordan’s rule; Jordan, 1891; Lindsey, 1988) calling into question the significance of the diagnostic features of these forms of C. alepidota. A recent study on their genetics (Bernardi et al., 2003) found that the two forms are reciprocally monophyletic (albeit based on relatively small sample sizes), but also found evidence of recent gene flow among them. In addition, the percent sequence divergence in the mitochondrial control region between California and Gulf populations is low (1.87%) compared to disjunct sister species with similar distributions (Dawson et al., 2006). In the absence of additional morphological data and analysis of genetic variation across their distributions, we do not recommend elevation of the population from California to species status.Published as part of Hastings, Philip A. & Springer, Victor G., 2009, Recognizing diversity in blennioid fish nomenclature (Teleostei: Blennioidei), pp. 3-14 in Zootaxa 2120 on page 8, DOI: 10.5281/zenodo.18809
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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