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FIGURE 6 in Pseudalataspora vanderlingeni n. sp. (Myxosporea: Bivalvulida) from gall bladders of the Cape hakes Merluccius capensis Castelnau, and M. paradoxus Franca (Teleostei: Merlucciidae)
No full textFIGURE 6. Pseudalataspora vanderlingeni: fresh spore under phase contrast. Scale bar = 10 µm.Published as part of Reed, Cecile, Kalavati, Chaganti, Mackenzie, Ken, Collins, Catherine & Hemmingsen, Willy, 2018, Pseudalataspora vanderlingeni n. sp. (Myxosporea: Bivalvulida) from gall bladders of the Cape hakes Merluccius capensis Castelnau, and M. paradoxus Franca (Teleostei: Merlucciidae), pp. 422-428 in Zootaxa 4497 (3) on page 426, DOI: 10.11646/zootaxa.4497.3.6, http://zenodo.org/record/145522
Pseudalataspora vanderlingeni n. sp. (Myxosporea: Bivalvulida) from gall bladders of the Cape hakes Merluccius capensis Castelnau, and M. paradoxus Franca (Teleostei: Merlucciidae)
No full textReed, Cecile, Kalavati, Chaganti, Mackenzie, Ken, Collins, Catherine, Hemmingsen, Willy (2018): Pseudalataspora vanderlingeni n. sp. (Myxosporea: Bivalvulida) from gall bladders of the Cape hakes Merluccius capensis Castelnau, and M. paradoxus Franca (Teleostei: Merlucciidae). Zootaxa 4497 (3): 422-428, DOI: 10.11646/zootaxa.4497.3.
FIGURE 7 in Pseudalataspora vanderlingeni n. sp. (Myxosporea: Bivalvulida) from gall bladders of the Cape hakes Merluccius capensis Castelnau, and M. paradoxus Franca (Teleostei: Merlucciidae)
No full textFIGURE 7. Maximum Likelihood consensus tree showing relationship of Pseudalataspora vanderlingeni (in bold), isolated from Merluccius capensis, to other Ceratomyza species, based on 18S rDNA sequence analysis. Bootstrap values indicating ≥ than 70% support for Maximum Likelihood and Maximum Parsimony analyses respectively are shown. Host species, geographical origin and accession numbers are listed after species names. 1myxosporean species also isolated from Archamia fucata; 2 also isolated from Cheilodipterus quinquelineatus/ Nectamia fusca/ Ostorhinchus cookii/ Apogon doederleini/; 3also isolated from Plectroglyphidodon leucozonus/ Chrysiptera cyanea/ Pomacentrus chrysurus/ Neoglyphidodon melas; 4 also isolated from Clupea harengus; 5also isolated from Aulopus filamentosus; 6also isolated from Aulopus filamentosus; 7also isolated from Aulopus filamentosus; 8myxosporean species isolated from monogenean Diplectanocotyla sp. on the gills of Megalops cyprinoides; 9also isolated from Belone belone.Published as part of Reed, Cecile, Kalavati, Chaganti, Mackenzie, Ken, Collins, Catherine & Hemmingsen, Willy, 2018, Pseudalataspora vanderlingeni n. sp. (Myxosporea: Bivalvulida) from gall bladders of the Cape hakes Merluccius capensis Castelnau, and M. paradoxus Franca (Teleostei: Merlucciidae), pp. 422-428 in Zootaxa 4497 (3) on page 427, DOI: 10.11646/zootaxa.4497.3.6, http://zenodo.org/record/145522
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
Examining the trophic ecology of five myctophid genera in the southern Benguela using morphological, stomach content and stable isotope analyses
Full text linkMyctophids, mesopelagic fishes commonly known as lanternfish, are a vital component of the oceanic food web. However, significant uncertainties about the feeding habits of co-occurring and potentially competing myctophid genera still exist. This study examined the trophic ecology of five genera of myctophid fishes from the southern Benguela, namely Diaphus spp., Gymnoscopelus spp., Lampanyctodes hectoris, Lampanyctus spp. and Symbolophorus spp. Fishes were collected during DFFE research surveys conducted in 2019 and were processed for morphological (M), stomach content (SC), and stable isotope (SI) analyses. The morphological analysis determined the relationship between gape and fish size for each genus and compared these between genera. The stomach content analysis evaluated the relative importance of prey items using percent frequency of occurrence (%F), percent numerical abundance (%N) and percentage contribution to dietary carbon (%C), and combined these into an index of relative importance (%IRI). Owing to the high concentration of lipids within the muscle tissue of myctophids, samples were run in duplicate (one lipidextracted and one untreated sample) to obtain accurate δ13C (to infer source production) and δ 15N (to infer trophic level) values. Significant linear relationships between gape and fish standard length (SL) were found for all genera, and average gape size relative to SL differed significantly between genera, with Symbolophorus spp. having the smallest and Lampanyctodes hectoris the largest values. Myctophids within the southern Benguela were generalist and opportunistic secondary and tertiary consumers. They consumed an array of macro- and meso-zooplankton with euphausiids being the principal prey item in terms of %IRI for all five genera. Significant differences in average prey length were observed between the genera and the positive sizerelated shift in average prey length noted for Symbolophorus spp. provided evidence of interand intrageneric dietary segregation. Although the differences in δ15N do not fully reflect the results obtained from the stomach content analysis, the hypothesis of inter- and intrageneric dietary segregation is further supported by Diaphus spp. and L. hectoris which both had significantly higher δ15N values compared to the other three genera, as well as by the positive (Diaphus spp., L. hectoris and Symbolophorus spp.), negative (Gymnoscopelus spp.) and nonsignificant (Lampanyctus spp.) size-related shifts in δ15N. Significant variation in δ13C values were found, with some genera showing complete segregation (e.g. Lampanyctus spp. and Symbolophorus spp.) or overlap (e.g. Diaphus spp., Gymnoscopelus spp. and Lampanyctus spp.) in their foraging habitats, resource use or source production. Furthermore, both positive (i.e. Diaphus spp. and L. hectoris) and negative (Gymnoscopelus spp.) size-related shifts in δ13C were observed, possibly indicating differential habitat use within each of these genera. However, the relationship between δ13C and SL for Diaphus spp. was significantly influenced by outliers, possibly indicating opportunistic feeding by some individuals. Myctophids are still largely understudied within this system. Therefore, despite the small sample size for each of the five genera, this study serves as a baseline for better understanding the role that these genera play within the southern Benguela food web. This knowledge is important for developing an ecosystem approach to fisheries management of mesopelagic fishes in the southern Benguela, should commercial exploitation of these resources begin as seems likely. Although the results of this study provide a glimpse into the trophic ecology of local myctophid genera, future studies should include increased sampling in terms of the numbers of individuals and genera examined and in spatial and temporal coverage through-out the entire southern Benguela
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