1,720,955 research outputs found
Diversidad de murciélagos en una gradiente altitudinal en la zona de amortiguamiento e influencia del Santuario Nacional Cordillera de Colán, Amazonas
Get PDFEl Santuario Nacional Cordillera de Colán (SNCC) es considerado una de las 22 áreas prioritarias para la conservación de mamíferos en el Perú; a la fecha, estudios que documenten la diversidad de mamíferos voladores en estos ecosistemas son nulos. Se presenta el primer estudio de diversidad y riqueza de murciélagos de una evaluación realizada en la temporada húmeda en la zona de Amortiguamiento e influencia del SNCC, en una gradiente altitudinal entre 1400 y 3000 m s. n. m. n. Se ubicaron cinco estaciones: Las Lechuzas (3000 m s. n. m.), Refugio Las Lechuzas (2600 m s. n. m.), Abado (2200 m s. n. m.), Guayaquil (1800 m s. n. m.) y La Unión (1400 m s. n. m.), en cada estación se instalaron redes de niebla a nivel de sotobosque. Con un esfuerzo de 21237.5 mrh se registraron 159 murciélagos distribuidos en 24 especies, 14 géneros y tres familias Phyllostomidae (86.79 %), Vespertilionidae (12.58 %) y Mormoopidae (0.63 %). Las estaciones Guayaquil y las Lechuzas presentaron mayor y menor riqueza respectivamente. Las especies Carollia perspicillata y Artibeus planirostris fueron las más abundantes en toda la evaluación. El análisis de gradiente altitudinal mostró una fuerte correlación inversamente proporcional entre la altitud y la riqueza de especies (r= -0.9646, p=0.008). Según el grupo funcional, se registraron cinco gremios tróficos donde el frugívoro fue el más predominante. En cuanto al estado de conservación del listado de murciélagos descritos sólo el murciélago Platyrrhinus ismaeli se encuentra como casi amenazado según legislación internacional
Dieta y estructura trófica de un ensamblaje de murciélagos en un bosque montano de los andes orientales del centro del Perú
Get PDFEstudia la dieta y estructura trófica de un ensamblaje de murciélagos en el Santuario Nacional Pampa Hermosa y su zona de amortiguamiento, en donde además se reporta la abundancia y riqueza de los murciélagos en relación a la altitud. Presenta los recursos consumidos por un ensamblaje de 36 especies de murciélagos y se establece los grupos funcionales que conforman el ensamblaje, además de los cambios de sus dietas en una gradiente altitudinal. Se presenta además la especialización de algunos murciélagos hacia determinados recursos, la amplitud y sobreposición de nicho de las especies.Tesi
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
PRIMER REGISTRO DE FOLIVORÍA EN Artibeus fraterculus y Artibeus planirostris EN ÁREAS DE BOSQUES SECOS DEL NORESTE DEL PERÚ
Get PDFWe present the record of the consumption and transfer of leaves of two species, Cynophalla flexuosa and Colicodendron scabridum (Capparaceae) by the bats Artibeus planirostris and Artibeus fraterculus, respectively. The finding was made in two localities of the province of Bagua and Utcubamba, department of Amazonas, between the months of January and March 2012, during an evaluation for bats for an Environmental Impact Estudy for 2D Sismic Prospecting and drilling of 02 wells in block 145, zone 1, ERM company. We installed 10 nets of mist in each sampling point, the nets were evaluated from 18:00 to 00:00 hours. Artibeus planirostris was captured in January, carrying in its mouth one leaf of Cynophalla flexuosa, and expelling pellets of this, while A. fraterculus was found in March, carrying one leaf of Colicodendron scabridum; both bats were pregnant females. We are presumed that these bats can consume leaf because of the source of protein and calcium that they could provide, but they are still having a frugivorous diet, which is corroborating with the finding of feces with seeds of A. planirostris.Se presenta el reporte del consumo y traslado de hojas de dos especies, Cynophalla flexuosa y Colicodendron scabridum (Capparaceae) por parte de los murciélagos Artibeus planirostris y Artibeus fraterculus, respectivamente. El hallazgo se realizó en dos localidades de las provincias de Bagua y Utcubamba del departamento de Amazonas, entre los meses de enero y marzo del año 2012, durante una evaluación de murciélagos para un Estudio de Impacto Ambiental para la Prospección Sísmica 2D y perforación de 02 pozos de Exploración en el Lote 145, zona 1, empresa ERM S.A. Se colocaron 10 redes de neblina por cada punto de muestreo, las redes fueron evaluadas desde las 18:00 hasta las 00:00 horas. Artibeus planirostris se capturó en el mes de enero transportando en su boca una hoja de Cynophalla flexuosa, con posterior expulsión de pellets. A. fraterculus se encontró en el mes de marzo, transportando una hoja de Colicodendron scabridum; ambos murciélagos fueron hembras preñadas. Es conocido que Artibeus presenta principalmente una dieta frugívora, más se demuestra que las especies estudiadas pueden consumir hojas, probablemente por la fuente de proteína y calcio que podrían proveer. A. planirostris estaría manteniendo su dieta frugívora, corroborando este hecho con el hallazgo semillas en sus heces recolectadas
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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