1,721,002 research outputs found
Natural forests loss and tree plantations: large-scale tree cover loss differentiation in a threatened biodiversity hotspot
No full textThis research was supported by funding from Fondecyt Grant No. 1171445 and Direccion de Investigacion of Universidad de La Frontera. AM and CZ are thankful to ANID/FONDAP/15110009. AH thanks the support of ANID No REDI170329 grant. Figures were refined by V Sontag (@illusscientia)
Proximity to forest plantations is associated with presence and abundance of invasive plants in landscapes of south-central Chile
No full textBeca Fondecyt 1211051, CONICYT AFB170008, Fondecyt 1180205, Fondecyt 11191021
Landscape Disturbance Gradients: The Importance of the Type of Scene When Evaluating Landscape Preferences and Perceptions
No full textEsta investigación fue financiada por subvenciones Fondecyt a A.A. (1171445) y P.M. (11191021), y por la Dirección de Investigación de la Universidad de La Frontera.This research was funded by Fondecyt grants to A.A. (1171445) and P.M. (11191021), and by Direccion de Investigacion of Universidad de La Frontera
Spatial congruence among indicators of recovery completeness in a Mediterranean forest landscape: Implications for planning large-scale restoration
No full textThis research was supported by funding from Fondecyt grant 1171445, FONDEF grant CA13I10276, CONICYT grant PAI80160058, and Direccion de Investigacion of Universidad de La Frontera, Chile. PM thanks the Sao Paulo Research Foundation for a postdoctoral grant (FAPESP 2016/00052-9, Brazil). A. M. thanks to CONICYT/FONDAP/15110009 grant, Chile
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
Deforestación en ecosistemas templados de la precordillera andina del centro-sur de Chile
No full textSe realizó un análisis multitemporal para determinar los cambios en la cobertura del suelo en una zona de la precordillera andina de la Región del Maule, Chile. Para ello se utilizaron imágenes satelitales de los años 1989 y 2003, y se analizaron las causas probables de la deforestación del bosque nativo presente en estos ecosistemas. El bosque nativo se redujo en un 44%, lo cual se traduce en una tasa de deforestación de 4,1% anual. La superficie de bosque nativo fue reemplazada preferentemente por coberturas de matorral (29%) y plantaciones de especies exóticas (27%). Una gran proporción de las actuales plantaciones exóticas está establecida sobre terrenos que anteriormente correspondían a bosque nativo (63%). La mayor pérdida de bosque nativo se concentra en niveles de elevación intermedia, donde se encuentra la mayor superficie de bosque nativo, asociándose también a una menor distancia de la red de caminos. El reemplazo del bosque nativo por matorrales se asocia principalmente a prácticas de floreo y extracción de leña, lo cual produce la degradación del bosque. La sustitución de bosque nativo por especies exóticas se explica por el incentivo a la forestación y por la creciente demanda de productos derivados de la madera y pulpa. Debido a los múltiples impactos que produce la deforestación se propone focalizar los incentivos estatales en áreas con altos niveles de deforestación y pobreza, presencia de especies amenazadas y menor disponibilidad de agua desde las cuencas. Adicionalmente, se propone priorizar la conectividad de las actuales áreas protegidas y el desarrollo de un sistema de fiscalización eficaz para el manejo de los bosques, el cual considere un monitoreo permanente con uso de tecnologías avanzadas
Deforestación en ecosistemas templados de la precordillera andina del centro-sur de Chile
Get PDFA multitemporal analysis to determine the land cover change was conduced in the pre-Andean range of Maule region of Chile. We used satellite imagery from the year 1989 and 2003 to analyze the likely causes of native forest change. In this period, there was a reduction in native forest area of 44% in the study area, which is equivalent to an annual forest loss rate of 4.1%. The native forest area is replaced by shrublands (29%) and exotic forest plantations (27%). A great proportion of current exotic forest plantations are established on lands that were native forest in 1989 (63%). Most forest loss was associated with intermediate elevation and less distance to road network, where native forest area dominated. Native forest replacing by shrublands was associated to selective forest logging and firewood, which leads to degradation of these forests. Native forest replacing by exotic forest plantations was the result of the forestation incentive and an increase in the demand for forest products such as wood and pulp. Because of multiple impacts of the forest loss, we propose to focus the government incentives. Priority areas for incentives must be characterized by high forest loss rate and poverty, presence of threatened species and low availability of water from catchments. Moreover, we propose to prioritize the connectivity of the current network protected areas and to develop an effective forest management monitoring system using advanced technologies.Se realizó un análisis multitemporal para determinar los cambios en la cobertura del suelo en una zona de la precordillera andina de la Región del Maule, Chile. Para ello se utilizaron imágenes satelitales de los años 1989 y 2003, y se analizaron las causas probables de la deforestación del bosque nativo presente en estos ecosistemas. El bosque nativo se redujo en un 44%, lo cual se traduce en una tasa de deforestación de 4,1% anual. La superficie de bosque nativo fue reemplazada preferentemente por coberturas de matorral (29%) y plantaciones de especies exóticas (27%). Una gran proporción de las actuales plantaciones exóticas está establecida sobre terrenos que anteriormente correspondían a bosque nativo (63%). La mayor pérdida de bosque nativo se concentra en niveles de elevación intermedia, donde se encuentra la mayor superficie de bosque nativo, asociándose también a una menor distancia de la red de caminos. El reemplazo del bosque nativo por matorrales se asocia principalmente a prácticas de floreo y extracción de leña, lo cual produce la degradación del bosque. La sustitución de bosque nativo por especies exóticas se explica por el incentivo a la forestación y por la creciente demanda de productos derivados de la madera y pulpa. Debido a los múltiples impactos que produce la deforestación se propone focalizar los incentivos estatales en áreas con altos niveles de deforestación y pobreza, presencia de especies amenazadas y menor disponibilidad de agua desde las cuencas. Adicionalmente, se propone priorizar la conectividad de las actuales áreas protegidas y el desarrollo de un sistema de fiscalización eficaz para el manejo de los bosques, el cual considere un monitoreo permanente con uso de tecnologías avanzadas
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