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Mesophotic sponges of the genus Callyspongia (Demospongiae, Haplosclerida) from Cuba, with the description of two new species
No full textBusutil, Linnet, García-Hernández, María R., Díaz, M. Cristina, Pomponi, Shirley A. (2018): Mesophotic sponges of the genus Callyspongia (Demospongiae, Haplosclerida) from Cuba, with the description of two new species. Zootaxa 4466 (1), DOI: 10.11646/zootaxa.4466.1.
Callyspongia (Callyspongia) pedroi Busutil & García-Hernández & Díaz & Pomponi 2018, sp. nov.
No full textCallyspongia (Callyspongia) pedroi sp. nov. (Figs. 1a–e, 2a–d) Material examined. Holotype: ANC 0 2.034, Cuba, Joint Cuba – U.S. Expedition R/ V F.G. Walton Smith, site C– 12A, Faro Roncali (W coast, Cuba), 21.868604° N 84.962657° W, depth 62.5 m, mesophotic coral reef, 22 May 2017, Collectors: M. C. Díaz & L. Busutil. Description. External morphology: Delicate cylindrical branches (3–6 mm in diameter, 10–14 cm long) that rarely anastomose, smooth surface to the naked eye, microconulose when observed microscopically (Fig. 1a–e). No distinct base, but specimens attach to the substrate at a few points. Oscules 1–3 mm in diameter (Fig. 1d–e), oval and flush with the surface, separated by 3–4 mm, arranged in rows on one side of the branch. The diameter at the tips sharply decreases, ending always in a pointed, bent end. Color light reddish to pink externally, tan internally. Tan in alcohol. Smooth surface, but rough to the touch. Soft, flimsy in consistency. No sand or foreign material on the surface. Subdermal round cavities (0.5–1 mm), abundant throughout the body, are evident to the naked eye (Fig. 1d). Spicules: Fusiform oxeas (Fig. 2d), 60– 82.4 –100 x 1.25– 2.5 –5 µm. Skeleton: Ectosome and choanosome have well–developed primary and secondary tangential fibers (Fig. 2a– c); no tertiaries can be distinguished. Primary fibers (20–40 µm in diameter); secondary fibers (10–15 µm in diameter). In the ectosome, large meshes (120–425 µm in diameter) and smaller meshes (50–350 µm). In the choanosome, a longitudinal section of the branch shows a peripheral condensation of the skeleton, with regular and condensed meshes at the surface that become more variable towards the interior of the branch. Meshes are angular, with various shapes ranging from triangular, to square or polygonal. Large primary meshes range from 200–500 µm diameter, while smaller secondary meshes are 40–330 µm. All fibers are cored, primaries with 1–6 spicules, and secondaries with 1–3 spicules (Fig. 2c). The presence of a peripheral condensation of the reticulation, and overall skeletal morphology indicates the closeness of this species with the subgenus Callyspongia Duchassaing & Michelotti, 1864. Distribution and ecology. Northwest, west, southwest, southeast and northeast coasts of Cuba (Table 2), mesophotic coral reef, depth range 44.4–102.4 m. At site C–50 (Table 1, depth 91.1 m) another specimen of similar size (12 cm long) and pink in color, similar to the holotype (Fig. 1b), was observed but not collected. Remarks. Based on external morphology, primarily the delicate nature of the branches, Callyspongia (C.) pedroi sp. nov. is similar to Callyspongia arcesiosa De Laubenfels, 1936 and Callyspongia (C.) densasclera Lehnert & Van Soest, 1999. However, Callyspongia (C.) pedroi sp. nov. differs from Callyspongia arcesiosa by the larger size of its fibers, and the diameter of the meshes that are at least double in size. The spicules of Callyspongia (C.) pedroi sp. nov. are 30% of the size of the spicules of Callyspongia (C.) densasclera, which is also described as having an abnormally dense conglomeration of spicules (measuring 184–232 x 6.5–8 µm) in the fibers, a fact not observed for Callyspongia (C.) pedroi sp. nov. Callyspongia (C.) densasclera has hastate oxeas, occasionally styles, while in Callyspongia (C.) pedroi sp. nov., oxeas are always fusiform (Tables 3, 4).Published as part of Busutil, Linnet, García-Hernández, María R., Díaz, M. Cristina & Pomponi, Shirley A., 2018, Mesophotic sponges of the genus Callyspongia (Demospongiae, Haplosclerida) from Cuba, with the description of two new species in Zootaxa 4466 (1), DOI: 10.11646/zootaxa.4466.1.9, http://zenodo.org/record/144212
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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