Papers by Francisco Castro Rego
O Uso do Fogo em Portugal - tradição e técnica
2.1 Fire Starts and Human Activities
Page 21. 2.1 Fire Starts and Human Activities Filipe X. Catry1, Francisco C. Rego1, Joaquim S. Si... more Page 21. 2.1 Fire Starts and Human Activities Filipe X. Catry1, Francisco C. Rego1, Joaquim S. Silva1, Francisco Moreira1, Andrea Camia2, Carlo Ricotta3 and Marco Conedera4 1Centre of Applied Ecology Prof. Baeta Neves ...
Agriculture, Ecosystems & Environment, 2020
Combining biodiversity conservation with the agricultural production needed to meet the rising wo... more Combining biodiversity conservation with the agricultural production needed to meet the rising world food demand is a global challenge. This is a case in point for olive farming in the Mediterranean region, where highyielding intensive and super-intensive orchards are fast expanding, often replacing biodiversity-rich but lowyielding traditional orchards. Here we test the hypothesis that production intensification reduces bird diversity within olive orchards, and that bird responses to such intensification are largely mediated by species traits. Breeding birds were counted in southern Portugal (2014-2016) at 78 orchards covering the entire intensification gradient. Using hierarchical joint species distribution modelling, we found that the intensification-level explained a large proportion of bird community variation (35%), while accounting for the significant contributions of orchard features (16%) and landscape context (16%). Species richness declined from traditional (29 species), through intensive (25), to super-intensive (20) orchards. The occurrence probability of many species also declined significantly from traditional to intensive (7 species; 22% of all species considered) and to super-intensive (14 species; 44%) orchards, while prevalence in more intensive orchards increased only for linnet and goldfinch (6%). Cavity-nester insectivores were the most affected functional group, declining steeply along the intensification gradient. Our results suggest that production intensification, and particularly the shift towards super-intensive systems, is reshaping and greatly simplifying breeding bird communities associated with olive orchards, which may become dominated by generalist granivores. This is a warning signal of widespread negative impacts on bird diversity that may be occurring due to olive farming intensification in the Mediterranean. Efforts are needed to reduce such impacts, which in the case of birds would require actions targeted primarily at cavity-nester insectivores. Tscharntke et al., 2012). To achieve this goal, however, more information is needed on the patterns and mechanisms of biodiversity change in different farming systems along intensification gradients (Green et al., 2005). Olive farming is a major agricultural system in the Mediterranean region, where it occupies ca. 10 million hectares (
Scientific Reports, 2020
Climate change is predicted to severely impact interactions between prey, predators and habitats.... more Climate change is predicted to severely impact interactions between prey, predators and habitats. In Southern Europe, within the Mediterranean climate, herbaceous vegetation achieves its maximum growth in middle spring followed by a three-month dry summer, limiting prey availability for insectivorous birds. Lesser kestrels (Falco naumanni) breed in a time-window that matches the nestling-rearing period with the peak abundance of grasshoppers and forecasted climate change may impact reproductive success through changes in prey availability and abundance. We used Normalised Difference Vegetation Index (NDVI) as a surrogate of habitat quality and prey availability to investigate the impacts of forecasted climate change and extreme climatic events on lesser kestrel breeding performance. First, using 14 years of data from 15 colonies in Southwestern Iberia, we linked fledging success and climatic variables with NDVI, and secondly, based on these relationships and according to climatic sc...
Observatorio de la economía latinoamericana, Apr 25, 2023
Análise das motivações e perspectivas de um case de startup do segmento de delivery Analysis of t... more Análise das motivações e perspectivas de um case de startup do segmento de delivery Analysis of the motivations and perspectives of a case of a delivery startup
Laboratory and clinical practices in antinuclear antibody detection and related antigens: recommendations from a Spanish multicentre survey
Immunologic Research, May 17, 2023
UNIVERSIDADES SUSTENTÁVEIS: a influência dos métodos qualitativos a partir de uma Revisão Sistemática de Literatura
Anais do Terceiro Sustentare e Sexto Wipis, 2022
Integrated Fire Management
Springer textbooks in earth sciences, geography and environment, 2021
Many people have called for Integrated Fire Management that effectively harnesses the power of fi... more Many people have called for Integrated Fire Management that effectively harnesses the power of fire to achieve land management goals. Often this includes using fire, and certainly, it involves managing both short- and long-term effects of fire informed by an understanding of both people and place. In eight case studies from around the globe, local experts describe successful variants of integrated fire management. Their stories illustrate innovative, proactive approaches to managing fires and the ecosystems, including people, in which those fires occur. Integrated Fire Management is different in each location, but it is always focused on long-term effectiveness in meeting strategic objectives, and the most effective practitioners are constantly listening, learning, and adapting while working with many different people. In this way, the case studies illustrate that effective fire management is informed by the scientific principles you’ve learned in prior chapters of our book, Fire science from chemistry to landscape management, but also depends on being flexible and adaptive to local and changing conditions. Such management uses fire as one of the tools to increase the benefits of fire while limiting the negative effects of fire in achieving social-ecological ecosystem goals strategically.
Aboveground biomass and net primary production of pine, oak and mixed pine–oak forests on the Vila Real district, Portugal
Forest Ecology and Management, Oct 1, 2013
ABSTRACT Pine and oak are common tree species in the Vila Real district, northern Portugal, a reg... more ABSTRACT Pine and oak are common tree species in the Vila Real district, northern Portugal, a region where forests are an important land use (38%). The net primary production (NPP) of these forests is not well known. The objective of this study was to quantify the aboveground biomass and aboveground NPP (ANPP) of pine (Pinus pinaster Aiton), pyrenean oak (Quercus pyrenaica Willd.) and mixed pine–oak forests in the Vila Real district and to evaluate the relationships between ANPP and their stand characteristics. To achieve this objective, 15 stands of pine, 15 stands of oak and 9 stands of mixed pine–oak were studied between 2008 and 2011. ANPP average (and range) of pine, oak and mixed stands were 7.9 (2.9–15.1), 7.3 (3.0–12.1), and 12.1 (6.5–17.2) Mg ha−1 yr−1, respectively. An analysis of covariance (ANCOVA), to reduce the within-groups variability and detect the differences between the stand compositions, was performed. In this analysis, we rejected the null hypothesis that the composition stands had the same mean among ANPP. Mixed stands had a significantly higher mean ANPP than pine or oak. Also, we verified that in pine, the greater distribution of biomass was on the stem (4.0 ± 0.7 Mg ha−1 yr−1, 50% of the total productivity) component where carbon sequestration is retained longer, whereas in oak and mixed stands the foliage was the component with the greater distribution of biomass (4.0 and 6.0 Mg ha−1 yr−1, respectively). Aboveground biomass was significantly different among the three stands types and averaged 83.4, 61.4 and 110.5 Mg ha−1 for pine, oak and mixed stands, respectively. Regression models performed showed that there was a strong relationship between aboveground biomass and basal area in all stands. This study concludes that the production efficiency, defined as stem productivity/leaf area index, was significantly different in mixed stands. Pine had the greatest production efficiency in all stand types and, in mixed stands, had 85% of the total production efficiency.
How to cite this article : Rego FC (2022) The Arrhenius Approach and The Effects of Anthropogenic... more How to cite this article : Rego FC (2022) The Arrhenius Approach and The Effects of Anthropogenic Heat on the Temperature of the Earth´s Surface. Environ Sci Ecol: Curr Res 3: 1080 Mini-Review The simpler approaches to model the temperatures at the Earth´s surface were based on simple steady-state radiative energy balance equations, where the Sun´s radiation absorbed at the surface equals the radiation emitted by the Earth to Space (Figure 1). In mathematical terms, the equation is: vA = ε σ T 4 where: v is the fraction of the Sun´s radiation absorbed by the Earth´s surface (globally evaluated as v=0.69), A is Sun´s radiation (on average considered to be around A=342.5 W m-2), ε is the emissivity of the Earth´s surface (often set at ε=1), σ is the Stefan-Boltzmann constant (σ=5.67 x 10-8 W m-2 K-4), and T is the absolute temperature of the Earth´s surface (K).
The search for better energy options has been central in the World concerns about global warming ... more The search for better energy options has been central in the World concerns about global warming and it has become even more urgent for many European countries with the current invasion of Ukraine and the search for alternatives to Russian fossil fuels. In some cases, as in the UK, alternative options are including developing nuclear energy. However, the unavoidable safety issues and the unsolved problem of the nuclear waste management have been long-term concerns, requiring that such decisions with long lasting consequences are better evaluated before taken. In this context, the increased urgency in finding appropriate energy solutions justifies the importance of revisiting some basic assumptions and conclusions. From the perspective of global warming, the assumption that CO 2 with other greenhouse gases are its only significant cause has been the basis for all international recommendations on energy options. Based on such understanding, fossil fuels should be gradually replaced by renewable energy sources that do not result in significant CO 2 emissions, and nuclear energy, in spite of the well-known concerns, has been now reconsidered in that light as a "clean" or "green" energy option. However, the assumption of cause-effect relation between CO 2 and global warming is not so clear, as there is also a reverse causality process where temperature increases also cause CO 2 increases at various temporal scales [1]. Moreover, CO 2 concentrations in the atmosphere are very homogeneous around the globe whereas temperature anomalies are spatially quite variable with urban or regional "heat islands" indicating that other factors also play a significant role. Arrhenius already indicated, in 1896, the importance of considering all factors in the energy balance of any point of the Earth. In his work, while focusing "on the influence of carbonic acid in the air upon the temperature of the ground", Arrhenius already included in his model "the quantity of heat that is conveyed (by other sources) to the air at the point considered".
The effect of fertilizing on the floristic composition of "lameiros" agrosystems
Pastagens e Forragens, 1990
Accionamientos de alto rendimiento para el control de máquinas de corriente alterna
Esta tesis se centra en el analisis y el desarrollo de accionamientos de alto rendimiento para el... more Esta tesis se centra en el analisis y el desarrollo de accionamientos de alto rendimiento para el control de maquinas de corriente alterna y en particular para el motor asincrono con el rotor en jaula de ardilla. El estudio esta dividido en cuatro areas de trabajo desde las que se mejora el comportamiento del accionamiento y que tienen un impacto directo en el incremento del rendimiento global del sistema, entendiendo como tal la red de suministro electrico, la carga acoplada a la maquina de induccion y el diseno electronico del propio accionamiento. Se ha desarrollado un hardware de potencia optimizado que incluye nuevos sistemas de mando de los dispositivos que forman el convertidor, asi como diferentes tecnicas de modulacion que mejoran el rendimiento energetico de la conversion electronica de energia. Se han estudiado distintas metodologia para la estimacion de diferentes parametros dentro del accinamiento. Se han evaluado estrategias de control robusto en modo deslizante para el control de la velocidad del rotor de la maquina. Los esquemas desarrollados logran un comportamiento robusto ante las perturbaciones a las que pueda estar sometido el sistema. Por ultimo se analiza el impacto de los accionamientos para maquinas de corriente alterna en la red de suministro electrico, introduciendose el analisis del rectificador PWM como el convertidor de entrada mas eficiente para este tipo de accionamientos, a los que va a dotar de unas caracteristicas de comportamiento ante la red practicamente ideales.
A vegetation dynamics study through permanent transects
Anais do Instituto Superior de Agronomia, 1994
Forest Response to Fires and Implications in Ecosystem Functioning and Management
Springer eBooks, 1992
The present Mediterranean environment is the result of long-standing human activity and fire. Fir... more The present Mediterranean environment is the result of long-standing human activity and fire. Fire must therefore be considered as an internal process of the Mediterranean ecosystems. The inter-relationships between man, fire ana the ecosystem are complex, but their understanding is of extreme importance for the development of adequate policies of fire management.
Foco, Aug 3, 2023
Recebido em: 03 de Julho de 2023 Aceito em: 02 de Agosto de 2023 RESUMO O objetivo desta pesquisa... more Recebido em: 03 de Julho de 2023 Aceito em: 02 de Agosto de 2023 RESUMO O objetivo desta pesquisa consiste em analisar, com base no princípio da eficiência, os processos de compras públicas em um município do alto oeste potiguar. A pesquisa caracteriza-se como um estudo de caso de caráter exploratório e descritivo, com a abordagem quanti-qualitativa. O universo da pesquisa foram os servidores que atuam diretamente no processo das compras públicas no município. A coleta de dados se deu através da aplicação de entrevistas organizadas por meio de um questionário. Diante dos dados analisados, constatou-se que os principais desafios enfrentados na busca pela eficiência nas aquisições se dá pela falta de comunicação entre os departamentos
Introducing the Fire Paradox
HAL (Le Centre pour la Communication Scientifique Directe), 2010
HAL (Le Centre pour la Communication Scientifique Directe), 2009
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Papers by Francisco Castro Rego