1,720,989 research outputs found
L'espansione di specie invasive di Litoria in Nuova Zelanda: conosci il passato per prevedere il futuro
No full textFrogs from the genus Litoria (L. aurea, L. raniformis, L. ewingìi) have been introduced to New
Zealand in the late eighteenth century a sbiological control agents and for the acclimatisation of European settlers. In this period, various introductions and translocations have resulted in the establishment of new populations scattered across NewZealand. During the following century their distribution ranges gradually expanded and in more recent years their spread has been accelerated by intense trading activities by private collectors. the aim of this study is to assess whether the range expansion of L. aurea, L. raniformis and L. ewingìi is currently on-going and to predict its future dynamics. For this purpose, we modelled: i) the habitat suitability for all three species based on their current distribution; ii) the frogs dispersal capabilities based on historical data. We then integrated these models in an automated algorithm to simulate their future range expansion. In order to validate our method, we simulated their current; distribution based on sighting locations recorded before1980 and compared the results with empirical data. Finally, we projected our model for the next decades based on their current distribution. Our models are coherent with the observed distributions and predict a possible further range expansion for all the study species. They also highlight the magnitude of the anthropogenic component of this process. Although there is no evidence of direct competition between Litoria and New Zealand native wildlife, the more abundant and mobile introduced species can act as a carrier for Batracochytrium dendrobatidis. Our model can be also used to predict the diffusion of B. dendrobatidis
Sexual dimorphism and allometry of the lacertid Mesalina balfouri (Blanford, 1881) endemic to the Archipelago of Socotra (Yemen)
No full textBy means of both classical and geometric morphometric protocols, the authors analyzed sexual dimorphism and allometry of the head of the lacertid Mesalina balfouri (BlANfORd, 1881), endemic to the Archipelago of Socotra. As a result, males presented an isometrically bigger head in comparison to females, whereas sexual dimorphism was non-existent in body size and head shape. in addition, a clear ontogenetic change of the head shape emerged. Possible explanations of the observed transformations are discussed
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
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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