1,721,012 research outputs found
Non-indigenous polychaetes along the Salento Peninsula: new records and first molecular data
Full text linkThe Salento Peninsula represents the eastern -most edge of the Italian Peninsula, and one of the first areas to be invaded by thermophilic non -indigenous species. The diversity of non -indigenous polychaetes occurring along the Salento Peninsula is reviewed based on literature data and new samples. Overall, fifteen non -indigenous polychaetes were recorded; among them, Syllis similisunzima is reported for the first time in the Mediterranean Sea; Lepidonotus tenuisetosus is recorded for the first time in Italian waters; Pseudonereis anomala, until now known only for Sicily, is reported for the first time from the Italian Peninsula; Dorvillea similis is a first record for the Ionian and Adriatic Sea. 16S rDNA and COI sequences were obtained for eleven species, allowing us in some cases to confirm their identity and/or geographical origin, while in the case of some species they represent the first molecular data ever obtained
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
Assessment of indirect impact of bottom trawling on cold-water corals in Blanes Canyon
No full textMemoria de tesis doctoral presentada por Meri Bilan para obtener el título de Doctor in Philosophy in
Biological and Environmental Sciences and Technologies por la University of Salento, realizada bajo la dirección del Dr. Stefano Piraino, del Dr. Pere Puig del Institut de Ciències del Mar (ICM-CSIC) y el Dr. Andrea Gori.-- 202 pages, figures, tablesBottom trawling is the most common form of extensive anthropogenic physical disturbance in the marine environment. Due to technical advancements and search for new fishing grounds, the depth limits for this fishing practice have extended below 1 000 m. In the northwest (NW) Mediterranean Sea, bottom trawling usually takes place on the continental shelf and slope, as well as on submarine canyon flanks and rims, where one of the target species is the blue and red deep sea shrimp Aristeus antennatus. Ploughing of fishing gears over the seabed resuspends large amounts of soft sediments, which are then further transported through submarine canyons towards deep sea environments in the form of turbidity currents or high suspended sediment concentration (SSC) nepheloid layers. Such sediment transport processes expand beyond fishing grounds, thus exerting a negative impact on organisms that were initially not influenced by the direct impacts of bottom trawling. This is especially important for benthic filter feeding organisms as the increased SSC can cause clogging of their feeding apparatus or hypoxia when sediment covers their bodies. Submarine canyons serve as a significant habitat for cold-water corals (CWCs), which are bottom-dwelling organisms that feed on suspended particles and can flourish on the walls of the canyon. The complex morphology of submarine canyons, as well as the diverse composition of their substrates, and their interaction with the hydrodynamics create favourable circumstances for the growth and distribution of CWCs. These are slow-growing, long-living, and structurally complex organisms particularly vulnerable to anthropogenic impacts. Alongside, they form dense aggregations of one or several species, where other organisms such as fish, crustaceans, gastropods, molluscs find shelter, feeding, and/or mating grounds. Several CWC species are considered endangered species in the Mediterranean Sea and are included in the IUCN Red list, the Barcelona Convention and in the LESRPE (Listado de Especies Silvestre sein Régimen de Protección); this further amplifies the importance of filling knowledge gaps for these species in a manner that can help future conservation and spatial management efforts. This thesis contributes to these efforts using Blanes Canyon (NW Mediterranean) as a case study, since important fishing grounds are found on its canyon flanks and rims, while the diversity, extent and vulnerability of megabenthic species in the canyon was up this to date unknown. In order to do this, research cruises (ABRIC 1 and ABRIC 2) were conducted in Blanes Canyon, where CTD casts and water sampling were performed along the canyon, as well as ROV video transects and faunal sampling by means of ROV.
The second chapter is dedicated to the description of the megabenthic communities found on the canyon walls along the canyon, with a focus on CWCs belonging to the orders Scleractinia, Antipatharia, Scleralcyonacea, and Malacalcyonacea. Based on the extensive high-resolution dataset acquired, a canyon gradient has emerged, where more solid corals (Scleractinia) were found in the more dynamic canyon head, whereas moving away from the canyon head, especially in the east canyon tributary, orders Antipatharia, Scleralcyonacea, and Malacalcyonacea prevail. This can be attributed to the changing environmental factors along the canyon, in terms of current speed, food availability, and sediment dynamics. Moreover, this study confirms Blanes Canyon as an important habitat for 13 species of CWCs, along with several rare species of sponges, molluscs, ascidian and fish.
The third chapter is dedicated to the water masses found in Blanes Canyon and the characterization of bottom trawling-induced nepheloid layers. Water samples taken in two distinct years across the canyon areas with and without bottom trawling activity show significant differences, indicating that bottom trawling, alongside other sediment dynamic processes, influence the quality of suspended matter arriving to the canyon interior.The fourth chapter is dedicated to experimentally evaluating the effects of increased SSC on CWC survival, growth, and physiology (respiration and excretion). Six relevant CWCs were chosen and subjected to three distinct, laboratory-based SSC over 9 months. The results of this study show that the responses are species-specific, where survival was the best indicator as physiology did not change significantly. Colonial scleractinians and antipatharians were most affected by the SSC, while octocorals and cup corals were not disturbed by increased SSC.
Overall, this thesis has filled in knowledge gaps on CWC distribution, environmental preferences, and corroborated the importance of submarine canyons as habitat for CWCs, highlighting Blanes Canyon as a significant reference habitat for future studies. Moreover, this study emphasizes the vulnerability of megabenthic species and the indirect negative effect, i.e., high SSC, of bottom trawling, that extends beyond the immediate fishing grounds. This finding can eventually inform policy decisions when considering conservation and mitigation measuresPeer reviewe
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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