Browsing by Author "Rodriguez, Juan"
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- A conic asssociated with Euler LinesPublication . Semião, Paulo; Rodriguez, Juan; Manuel, PaulaWe study the locus of a point C for which the Euler line of triangle ABC with given A and B has a given slope m. This is a conic through A and B, and with center (if it exists) at the midpoint of AB. The main properties of such an Euler conic are described. We also give a construction of a point C for which triangle ABC, with A and B fixed, has a prescribed Euler line.
- Connectivity, neutral theories and the assessment of species vulnerability to global change in temperate estuariesPublication . Chust, G.; Albaina, A.; Aranburu, A.; Borja, A.; Diekmann, O. E.; Estonba, A.; Franco, J.; Garmendia, J. M.; Iriondo, M.; Muxika, I.; Rendo, F.; Rodriguez, Juan; Ruiz-Larrañaga, O.; Serrão, Ester; Valle, M.One of the main adaptation strategies to global change scenarios, aiming to preserve ecosystem functioning and biodiversity, is to maximize ecosystem resilience. The resilience of a species metapopulation can be improved by facilitating connectivity between local populations, which will prevent demographic stochasticity and inbreeding. This investigation estimated the degree of connectivity among estuarine species along the north-eastern Iberian coast, in order to assess community vulnerability to global change scenarios. To address this objective, two connectivity proxy types have been used based upon genetic and ecological drift processes: 1) DNA markers for the bivalve cockle (Cerastoderma edule) and seagrass Zostera noltei, and 2) the decrease in the number of species shared between two sites with geographic distance. Neutral biodiversity theory predicts that dispersal limitation modulates this decrease, and this has been explored in estuarine plants and macroinvertebrates. Results indicate dispersal limitation for both saltmarsh plants and seagrass beds community and Z. noltei populations; this suggests they are especially vulnerable to expected climate changes on their habitats. In contrast, unstructured spatial pattern found in macroinvertebrate communities and in C. edule genetic populations in the area suggests that estuarine soft-bottom macroinvertebrates with planktonic larval dispersal strategies may have a high resilience capacity to moderate changes within their habitats. Our findings allow environmental managers to prioritize the most vulnerable species and habitats to be restored.
- Um olhar sobre uma competição matemática na Web: os SUBsPublication . Carreira, Susana; Amado, Nélia; Ferreira, Rosa; Silva, Jaime Carvalho e; Rodriguez, Juan; Jacinto, Hélia; Amaral, Nuno; Nobre, Sandra; Martins, Isa; Reis, Sílvia; Mestre, Rita BritoProblem@Web é um projeto de investigação na área da Educação Matemática, financiado pela Fundação para a Ciência e a Tecnologia, instituto público tutelado pelo Ministério da Educação e Ciência que promove e financia projetos em todos os domínios da ciência e da tecnologia. Este projeto tem como objetivo geral estudar a resolução de problemas de matemática num contexto exterior à sala de aula – as competições matemáticas baseadas na Internet, nas quais se incluem os campeonatos de matemática SUB12 e SUB14, promovidos pelo Departamento de Matemática da Faculdade de Ciências e Tecnologia da Universidade do Algarve. O SUB12 e o SUB14 são campeonatos de resolução de problemas dirigidos a todos os alunos dos 5º, 6º, 7º e 8º anos de escolaridade das regiões do Algarve e Alentejo e decorrem online, culminando com uma final presencial.