1,721,007 research outputs found
The Distribution, Status, and Conservation Outlook of the Drill (Mandrillus leucophaeus) in Cameroon
No full textThe populations of many endangered species are becoming increasingly fragmented, and accurate, current information on the status of these subpopulations is essential for the design of effective conservation strategies within a human-dominated landscape. The drill (Mandrillus leucophaeus) is one of the most spectacular and endangered primates in Africa, yet up-to-date information on its distribution, population status, and conservation outlook is lacking. Cameroon has been estimated to encompass 80 % of the species' range. We examined the distribution, population status, and conservation outlook for the drill throughout its historic range in Cameroon. To do this, we divided the historic range of the drill in Cameroon (46,000 km(2)) into 52 survey units along natural and manmade boundary features. Based on a series of field surveys in 2002-2009, village interviews, analysis of geospatial data, and bibliographical research, we assigned each survey unit a rank of 0-4 for 15 parameters indicative of current situation for drills, habitat suitability, and conservation outlook. We obtained direct evidence for the presence of drills in 16 of the 52 survey units, with those of Ejagham, Korup, Ebo, and Nta Ali receiving the highest index scores. We warn of local extirpations and increased isolation among drill populations due to loss of dispersal corridors, e.g., Douala Edea survey unit. In some cases drills persist in forest fragments within human-dominated landscapes, e.g., Kupe-Manenguba, but the species' future is probably dependent on effective wildlife management in a handful of isolated strongholds where probability of long-term protection is higher, particularly in Korup National Park, Takamanda National Park, and the proposed Ebo National Park. Pressure from current and proposed large-scale commercial plantations, oil prospecting, logging, and the continual human population growth in this region means that a concerted conservation effort will be needed to safeguard the remaining drill habitat if the species is to survive in Cameroon
Rethinking Spatial Prioritisation for Primate Conservation in an Unprotected Intact Forest Landscape in the Gulf of Guinea
No full textABSTRACT While protected areas are the cornerstones of biodiversity, unprotected areas are also critical for primate conservation. It is essential to understand primate responses to human pressure in such areas to guide conservation planning. The unprotected Yabassi Key Biodiversity Area (YKBA), Cameroon, comprising the Ebo, Ndokbou and Makombe forests, is one of the largest remaining tracts of intact forests in the Gulf of Guinea biodiversity hotspot. Unfortunately, knowledge of its primate community remains very limited. Only the Ebo forest, known for its small gorilla population, benefits from consistent conservation attention. This neglect diminishes recognition of YKBA's broader significance for primates. From January to December 2019, we conducted primate surveys across the YKBA, covering over 1500 km of reconnaissance walks and recorded eight of its 10 known diurnal primate species. We overlaid 1x1 km grid cells across the area and applied Bayesian regression models to examine how species richness and occurrence probabilities vary across the three forest blocks and respond to anthropogenic pressure gradients. Our findings revealed higher species richness in Ebo and Ndokbou compared to Makombe. While Preuss's monkeys were absent and chimpanzees and red‐capped mangabeys were very uncommon in Makombe, the predicted occurrence probabilities of other species were relatively similar across the three sites. Species richness increased strongly with distance from roads and moderately with elevation. Yet individual species showed variable patterns along anthropogenic gradients, resulting in contrasting predicted species distribution in the landscape, which suggests that spatial prioritisation based solely on remoteness may fail to conserve species inhabiting easily accessible areas. These results underscore the greater importance of the YKBA for primate conservation than previously recognised. The considerable distribution of primates in Ndokbou and Makombe highlights the need for conservation interventions beyond Ebo. We recommend expanding conservation efforts to encompass the entire YKBA, with a focus on mitigating hunting and land conversion to ensure long‐term human‐primate coexistence.Mohamed bin Zayed Species Conservation Fund https://doi.org/10.13039/501100011672Tusk Trust https://doi.org/10.13039/50110002055
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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