1,721,034 research outputs found
Identification of Monogenea made easier: a new statistical procedure for an automatic selection of diagnostic linear measurements in closely related species
No full textWe introduce a new statistical method to select which morphological
characters are most useful to identify monogenean species. The method
estimates the average size overlap of candidate diagnostic structures
among a set of species to individuate those that mostly differ between
the species. To demonstrate our approach, we report a comprehensive
analysis conducted on two of the most species-rich monogenean genera:
Dactylogyrus Diesing, 1850 and Gyrodactylus von Nordmann, 1832. We
demonstrate that, in contrast to common taxonomic practice, very few but
highly diagnostic measurements are necessary to correctly identify a
specimen. In particular, we found that most of Dactylogyrus and
Gyrodactylus species can be classified on the basis of the width of the
supplementary connecting bar and of the length of the hook sickle,
respectively
figure 11 in Phylogenetics and taxonomy of the scleractinian coral family Euphylliidae
No full textfigure 11 Extended tentacles of (a) Galaxea fascicularis, (b) Galaxea astreata, (c–d, same colony) Gyrosmilia interrupta, all from Nosy Sakatia, Madagascar. White arrows point at polyp mouths. Scale bars: 1 cm.Published as part of Arrigoni, Roberto, Stolarski, Jarosław, Terraneo, Tullia I., Hoeksema, Bert W., Berumen, Michael L., Payri, Claude, Montano, Simone & Benzoni, Francesca, 2023, Phylogenetics and taxonomy of the scleractinian coral family Euphylliidae, pp. 130-171 in Contributions to Zoology 92 (2) on page 150, DOI: 10.1163/18759866-bja10041, http://zenodo.org/record/834999
figure 3 in Phylogenetics and taxonomy of the scleractinian coral family Euphylliidae
No full textfigure 3 Bayesian inference molecular phylogeny reconstruction of Euphylliidae based on three mitochondrial loci (coi, 12S rRNA, and 16S rRNA). Numbers at nodes indicate Bayesian posterior probabilities (Ẑ0.70), maximum likelihood bootstrap supports (Ẑ70), and maximum parsimony supports (Ẑ70), respectively. Colours and clade names refer to Luzon et al. (2017, 2018).Published as part of Arrigoni, Roberto, Stolarski, Jarosław, Terraneo, Tullia I., Hoeksema, Bert W., Berumen, Michael L., Payri, Claude, Montano, Simone & Benzoni, Francesca, 2023, Phylogenetics and taxonomy of the scleractinian coral family Euphylliidae, pp. 130-171 in Contributions to Zoology 92 (2) on page 141, DOI: 10.1163/18759866-bja10041, http://zenodo.org/record/834999
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
Nestedness for Dummies (NeD): A User-Friendly Web Interface for Exploratory Nestedness Analysis
Full text linkRecent theoretical advances in nestedness analysis have led to the introduction of several alternative metrics to overcome most of the problems biasing the use of matrix 'temperature' calculated by Atmar's Nestedness Temperature Calculator. However, all of the currently available programs for nestedness analysis lack the user friendly appeal that has made the Nestedness Temperature Calculator one of the most popular community ecology programs. The software package NeD is an intuitive open source application for nestedness analysis that can be used online or locally under different operating systems. NeD is able to automatically handle different matrix formats, has batch functionalities and produces an output that can be easily copied and pasted to a spreadsheet. In addition to numerical results, NeD provides a graphic representation of the matrix under examination and of the corresponding maximally packed matrix. NeD allows users to select among the most used nestedness metrics, and to combine them with different null models. Integrating easiness of use with the recent theoretical advances in the field, NeD provides researchers not directly involved in theoretical debates with a simple yet robust statistical tool for a more conscious performance of nestedness analysis. NeD can be accessed at http: //purl.oclc.org/ned
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
Description of Turritopsoides marhei sp. nov. (Hydrozoa, Anthoathecata) from the Maldives and its phylogenetic position
No full textAppropriate 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
Pteroclava krempfi-octocoral symbiosis: new information from the Indian Ocean and the Red Sea
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