1,720,963 research outputs found
A new and possibly critically endangered species of casque-headed tree frog Aparasphenodon Miranda-Ribeiro, 1920 (Anura, Hylidae) from southeastern Brazil
No full textAssis, Clodoaldo Lopes De, Santana, Diego José, Silva, Fabiano Aguiar Da, Quintela, Fernando Marques, Feio, Renato Neves (2013): A new and possibly critically endangered species of casque-headed tree frog Aparasphenodon Miranda-Ribeiro, 1920 (Anura, Hylidae) from southeastern Brazil. Zootaxa 3716 (4): 583-591, DOI: 10.11646/zootaxa.3716.4.
FIGURE 6 in A new species of Hatchet-faced Treefrog Sphaenorhynchus Tschudi (Anura: Hylidae) from Quadrilátero Ferrífero, Minas Gerais, southeastern Brazil
Get PDFFIGURE 6. (A) Male of Sphaenorhynchus canga sp. nov. calling from the floating vegetation. (B), (C) and (D) Dorsal color pattern of S. canga sp. nov. in life.Published as part of Araujo-Vieira, Katyuscia, Lacerda, João Victor A., Pezzuti, Tiago L., Leite, Felipe Sá Fortes, Assis, Clodoaldo Lopes De & Cruz, Carlos Alberto G., 2015, A new species of Hatchet-faced Treefrog Sphaenorhynchus Tschudi (Anura: Hylidae) from Quadrilátero Ferrífero, Minas Gerais, southeastern Brazil, pp. 96-114 in Zootaxa 4059 (1) on page 105, DOI: 10.11646/zootaxa.4059.1.5, http://zenodo.org/record/23638
Ranacephala hogei (Mertens, 1967): novos registros de ocorrência, história natural e subsídios para manejo e avaliação do estado de conservação
Get PDFHere we present the results of a long-term study on the threatened freshwater turtle Ranacephala hogei (Mertens, 1967). This species is endemic to the Atlantic Forest of southeastern Brazil and occurs in the states of Minas Gerais, Rio de Janeiro, and Espírito Santo. It inhabits the river basins of the Paraíba do Sul, Itapemirim, Lagoa Feia, and Córrego São Salvador. Ranacephala hogei is globally classified as Critically Endangered (CR) and is the only Brazilian chelonian included among the 25 most threatened turtle species worldwide. In addition, it is the first freshwater turtle species in Brazil selected for a captive management program. This prominence reflects the severe threats faced by the species, as its distribution is concentrated in some of the most densely populated regions of the country. Nevertheless, despite its high conservation relevance, R. hogei remains poorly studied, and even basic biological data are scarce. The lack of such information hampers conservation actions, compromises assessments of its conservation status, and weakens the efficient allocation of resources directed toward the species. In this context, we conducted a long-term study to update its geographic distribution and provide data on its natural history, with particular emphasis on coloration. Data collection began in 2016 and involved trapping, visits to scientific collections, literature review, citizen science, and spectrophotometric analyses. Among these approaches, citizen science proved to be particularly important, contributing the majority of occurrence records. Our results increased the number of known occurrence localities by 144%, totaling 45 localities for the species. These records expanded its known distribution, added a new river basin to its range, and revealed populations previously considered extinct. Spectrophotometric analyses showed that, despite its conspicuous appearance, the coloration of R. hogei provides effective camouflage in aquatic environments. The species also exhibits sexual and ontogenetic differences in brightness, with females being brighter than males. We further suggest that its shy behavior is associated with its conspicuous coloration. Overall, our findings provide valuable information that will contribute to future assessments of the conservation status of R. hogei and to the development of effective ex situ management strategies. Keywords: Atlantic Forest; distribution; coloration Chelidae; Testudines; conservation; geographicNa presente tese apresentamos os resultados de um estudo de longo prazo realizado com o ameaçado cágado Ranacephala hogei (Mertens, 1967). Essa espécie é endêmica da Mata Atlântica do Sudeste do Brasil, ocorrendo nos estados de Minas Gerais, Rio de Janeiro e Espírito Santo. Vive nas bacias dos rios Paraíba do Sul, Itapemirim, da Lagoa Feia e do Córrego São Salvador. Ranacephala hogei é mundialmente considerada “Criticamente Ameaçada” (CR), sendo o único quelônio brasileiro incluído entre as 25 espécies de tartarugas mais ameaçadas do planeta. Além disso, é a primeira espécie de cágado do Brasil escolhida para um programa de manejo em cativeiro. Todo esse destaque se deve às ameaças impostas a essa espécie, uma vez que sua distribuição se concentra nas regiões mais populosas do país. No entanto, mesmo com todo esse apelo conservacionista, R. hogei possui grande carência de estudos, e até mesmo dados básicos são escassos. A falta desses dados prejudica as ações de conservação, compromete as avaliações sobre seu status de conservação e fragiliza a alocação eficiente de recursos para a espécie. Diante desse cenário, realizamos uma pesquisa de longo prazo para atualizar sua área de distribuição e fornecer dados sobre sua história natural, com foco em sua coloração. Iniciamos a coleta de dados em 2016, envolvendo capturas com armadilhas, visitas a coleções científicas, revisão de literatura, ciência cidadã e análises de espectrofotometria. Entre esses métodos, a ciência cidadã se mostrou altamente importante, contribuindo com a grande maioria dos registros. Os resultados ampliaram os pontos de ocorrência conhecidos em 144%, totalizando 45 localidades de ocorrência da espécie. Esses registros expandiram sua distribuição, adicionaram uma nova bacia hidrográfica à sua área de ocorrência e revelaram populações previamente consideradas extintas. Em relação à espectrofotometria, os resultados revelaram que a coloração de R. hogei, apesar de chamativa, lhe confere camuflagem no ambiente aquático. A espécie também apresenta diferenças sexuais e ontogenéticas em relação ao brilho, sendo as fêmeas mais brilhantes que os machos. Acreditamos, ainda, que seu comportamento tímido está relacionado às suas cores conspícuas. Por fim, nossos dados trouxeram informações relevantes que contribuirão para futuras avaliações sobre o status de conservação de R. hogei, bem como para seu manejo ex situ. Palavras-chave: Mata Atlântica; Chelidae; Testudines; conservação; distribuição geográfica; coloraçãoCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq
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
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