1,720,962 research outputs found
Population viability analysis of the population of Raffles' banded langurs Presbytis femoralis in Singapore
No full textWoolloff, Amy, Svensson, Magdalena S., Jabbar, Sabrina, Ang, Andie, Nijman, Vincent (2023): Population viability analysis of the population of Raffles' banded langurs Presbytis femoralis in Singapore. Raffles Bulletin of Zoology 71: 542-552, DOI: 10.26107/RBZ-2023-004
Advancing conservation of threatened primates
No full textOur closest living relatives—the non-human primates—are in trouble. Approximately 64% of the 536 currently recognized species are included in one of the threatened categories of the IUCN Red List, with 16% categorized as Critically Endangered. How did this happen? Many factors combine to threaten primates: deforestation and habitat fragmentation reduce resources and restrict dispersal and gene flow; encroachment and urban expansion into primate habitats extend the human–wildlife interface, heightening the potential for conflicts and pathogen transmission; and extraction of primates for biomedicine, consumption and the pet and wildlife trade (notably for rituals and so-called medicine) reduces populations and affects demography. These threats drive mortality, decrease adaptability and lead to local extinctions, with profound—and potentially irreversible—effects on primates and the ecosystems they inhabit.Fil: Oklander, Luciana Inés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Universidad Nacional de Misiones. Instituto de Biología Subtropical; ArgentinaFil: Ang, Andie. Mandai Nature; SingapurFil: Ikemeh, Rachel Ashegbofe. Sw/niger Delta Forest Project; Nigeri
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
Genetic Variability, Diet Metabarcoding, and Conservation of Colobine Primates in Vietnam
Get PDFThis dissertation examines the genetic variability and diet of three colobine species across six sites in Vietnam: the endangered black-shanked douc (Pygathrix nigripes, BSD) in Ta Kou Nature Reserve, Cat Tien National Park, Nui Chua National Park, and Hon Heo Mountain; endangered Indochinese silvered langur (Trachypithecus germaini, ISL) in Kien Luong Karst Area (specifically Chua Hang, Khoe La, Lo Coc and Mo So hills); and critically endangered Tonkin snub-nosed monkey (Rhinopithecus avunculus, TSNM) in Khau Ca Area. A total of 395 fecal samples were collected (July 2012-October 2014) and genomic DNA was extracted. This research provides the first information on their mitochondrial hypervariable region I variability and also pioneers the characterization of their diet using DNA metabarcoding in association with next-generation sequencing. BSDs exhibit high variability but no gene flow between populations. Similarly, ISLs showed high variability but only the subpopulation in Khoe La, the site under mining disturbance, retains most of the remaining genetic diversity in the species. Zero mitochondrial variability was found in TSNMs, the lowest ever reported for primate species in the wild. Diet sequences of colobines were matched to plant databases for identifications. Forty plant families were recorded for BSDs, including new records from 18 families, 15 genera and 13 species. There was little overlap in their diet with only six taxa found across four populations. They were also selective by feeding on less abundant species. Twenty-five families were recorded for ISLs, including new records from nine families, 18 genera and 14 species. Moraceae dominated their diet as retrieved from fecal samples, and was also the top family as revealed by field observations, demonstrating the significance of this plant family in their diet. Eighteen families were identified for TSNMs, including new records from three families, five genera and three species. The dominant taxon belonged to Polyalthia (Annonaceae) and they were also the dominant genus and family respectively within Khau Ca Area.This research highlights the importance of using genetic methods to complement field observations so as to better understand population viability and dietary profiles in order to identify priority actions for the conservation of colobine primates.</p
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