1,720,954 research outputs found
Κατανομή και εκτίμηση αφθονίας ζωνοδέλφινων (Stenella coeruleoalba) στην Ελληνική Τάφρο
Get PDFΤα ζωνοδέλφινα (Stenella coeruleoalba) είναι ένα από τα πιο κοινά είδη κητωδών στην Μεσόγειο θάλασσα με φθίνουσα κλίση από τα δυτικά προς τα ανατολικά (Notarbartolo di Sciara & Birkun, 2010). Το είδος έχει χαρακτηριστεί ως μόνιμος κάτοικος της λεκάνης των Λεβαντίνων, με ετήσια παρουσία, (Kerem et al., 2012) και των Ελληνικών θαλασσών (Frantzis, 2009). Ο πληθυσμός τους έχει χαρακτηριστεί ως «Τρωτός» (Aguilar & Gaspari, 2012) από τη IUCN (Red List of the IUCN, 2008). Η ενημερωμένη διαχείριση για την διατήρηση των θαλάσσιων θηλαστικών απαιτεί κατανόηση του μεγέθους του πληθυσμού και των προτιμητέων βιοτόπων από το είδος. Για τις Ελληνικές θάλασσες τέτοια δεδομένα είναι απαραίτητα για την αξιολόγηση και την μείωση των ανθρωπογενών επιπτώσεων, όπως η αλιευτική δραστηριότητα. Η παρούσα μελέτη παρουσιάζει μια μεγάλης κλίμακας εκτίμηση αφθονίας, πυκνότητας και προτίμησης βιοτόπων των ζωνοδέλφινων (Stenella coeruleoalba) στην περιοχή της Ελληνικής Τάφρου. Με την ανάλυση της μεθόδου δειγματοληψίας αποστάσεων (distance sampling), ο πληθυσμός των δελφινιών εκτιμήθηκε στα 6613 άτομα (CV = 0.17; 95%CI 4716-9273) από 12 χρόνια συλλογής δεδομένων. Η ανιχνευσιμότητα των ζωνοδέλφινων επηρεάστηκε από τις συνθήκες της θάλασσας (Μποφόρ) και το μέγεθος της ομάδας των δελφινιών που ανιχνεύθηκαν. Οι παρατηρήσεις είχαν αποτελεσματική εμβέλεια στα 209 μέτρα με τις περισσότερες από αυτές να πραγματοποιήθηκαν σε μικρές αποστάσεις. Η αφθονία και η πυκνότητα των ζωνοδέλφινων ήταν μεγαλύτερες στα πελαγικά νερά με μεγαλύτερα βάθη. Η μοντελοποίηση του προτιμούμενου βιοτόπου επίσης συσχέτισε την παρουσία των δελφινιών με νερά βάθους >500, μεγάλες κλίσεις του πυθμένα και υψηλότερες θερμοκρασίες στης επιφάνειας της θάλασσας (SSTs). Τα δεδομένα κατανομής θα πρέπει να ενημερώνουν τις στρατηγικές διαχείρισης και τις περιβαλλοντικές εκτιμήσεις για πιθανές ανθρωπογενείς απειλές για αυτό το προστατευόμενο είδος Λαμβάνοντας υπόψη ότι τα δεδομένα δεν εμφανίστηκαν επαρκή για την ανάλυση, τα αποτελέσματα που παρουσιάζονται εδώ ιδανικά θα πρέπει να επικυρωθούν από πιο συστηματικές μελέτες και ευρύτερες εύρυνες στην περιοχή της Ελληνικής Τάφρου. Παρόλα αυτά, καμία μελέτη μέχρι στιγμής δεν έχει διεξαχθεί για την αφθονία των ζωνοδέλφινων και αυτά τα αποτελέσματα συμβάλλουν σε περεταίρω εκτιμήσεις.Striped dolphins are the most common cetacean in the Mediterranean Sea, with a declining west to east abundance gradient (Notarbartolo di Sciara & Birkun, 2010). The species is classified as a regular resident of the Levantine basin, with year round presence (Kerem et al., 2012) and the Greeks Seas (Frantzis, 2009). Its population has been characterized as “Vulnerable” (Aguilar & Gaspari, 2012) by the IUCN (Red List of the IUCN, 2008). Informed conservation management of marine mammals requires an understanding of population size and habitat preferences. For the Greek seas, such data are needed for the assessment and mitigation of anthropogenic impacts, such as fisheries interactions. This study presents large-scale estimates of abundance, density and habitat preferences of striped dolphins (Stenella coeruleoalba) over the area of the Hellenic trench. Using distance sampling analyses, dolphins were estimated to be 6613 (CV = 0.17; 95% CI 4716-9273) derived from 12 years of data. The detectability of striped dolphins was influenced from Beaufort conditions and the group size of dolphins detected. Observations had an effective range of 209 meters with most of the detections achieved in smaller distances. Striped dolphin abundance and density was higher in pelagic waters with higher depths. Habitat modelling also associated striped dolphins with waters of >500 depth, high slope, and higher sea surface temperatures (SSTs). Distributional data should inform management strategies and environmental assessments of potential anthropogenic threats to this protected species. Taking into account that data did not appear efficient for the analysis, the results presented here ideally need to be validated by a more systematic and region-wide survey of the Hellenic Trench. Nevertheless, no previous study has been conducted for the abundance of striped dolphins and these results contribute for further assessments
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
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
- …
