Encontrados 29 documentos, a visualizar página 1 de 3
Endozoochory largely outweighs epizoochory in migrating passerines
Costa, Jose M.; Ramos, Jaime A.; da Silva, Luís P.; Timoteo, Sergio; Araujo, Pedro M.; Felgueiras, Marsial S.; Rosa, Antonio; Matos, ClaudiaFruits and seeds are critical food sources for many European passerines during the autumn migration, which in turn contribute to disperse seeds either internally, i.e. after ingestion (endozoochory), or externally, when seeds adhere to the body surface (epizoochory). Despite the recognized importance of birds as seed dispersers, the vast majority of studies focused on endozoochory while the external transport o...
Assessing the role of body mass and sex on apparent adult survival in polygynou...
Monticelli, David; Araujo, Pedro M.; Hines, James E.; Tenreiro, Paulo Q.; Silva, Luis P.; Ramos, Jaime A.Adult survival, an important fi tness component, is usually 1) lower in lighter individuals due to their reduced ability to survive winter conditions compared to heavier ones, especially in resident species at northern temperate latitudes and 2) lower in females compared with males due to higher reproductive costs incurred by females. In this paper, a capture – mark – recapture dataset of 649 cetti ’ s warblers...
Competition among european robins Erithacus rubecula in the winter quarters: Se...
Campos, Ana R.; Catry, Paulo; Ramos, Jaime; Robalo, Joana IsabelCompetition for resources by individuals of different sexes, ages, body sizes or geographical originsmay have varied implications, from demography to the evolution ofmigratory systems. European robins Erithacus rubecula display segregation by habitat in relation to sex, age, body size and geographic origin in the winter quarters. Here we report on an experiment to investigate the existence of asymmetries in the...
As Aves Marinhas como Indicadores Ecológicos
Ramos, Jaime AlbinoSumário da Lição, apresentado para Provas de Agregação em Biologia, na especialidade de Ecologia, da Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Biologia da Conservação
Ramos, Jaime AlbinoRelatório de Unidade Curricular, apresentado para Provas de Agregação em Biologia, na especialidade de Ecologia, da Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Mosquito species distribution in mainland Portugal 2005-2008
Osório, Hugo C.; Amaro, Fátima; Zé-Zé, Líbia; Pardal, Sara; Mendes, Luísa; Ventim, Rita; Ramos, Jaime A.; Nunes, Sofia; REVIVE workgroupInformation on distribution and relative abundance of the mosquito fauna of mainland Portugal has been collected by several surveillance programmes and projects over a long period. The work presented here documents additional information provided by capture of adult mosquitoes by the use of CDC light traps baited with CO2 in 48 localities in 13 districts in different parts of mainland Portugal during the period...
Small bowel tumors detection in capsule endoscopy by gaussian modeling of color...
Martins, Maria M.; Barbosa, Daniel; Ramos, Jaime; Lima, C. S.This paper is concerned with the classification of tumoral tissue in the small bowel by using capsule endoscopic images. The followed approach is based on texture classification. Texture descriptors are derived from selected scales of the Discrete Curvelet Transform (DCT). The goal is to take advantage of the high directional sensitivity of the DCT (16 directions) when compared with the Discrete Wavelet Transfo...
Detection of small bowel tumors in endoscopic capsule images by modeling non-ga...
Barbosa, Daniel; Ramos, Jaime; Tavares, Adriano; Lima, C. S.This paper presents an approach to the automatic detection of small bowel tumors by processing endoscopic capsule images. The most significant texture information is selected by using wavelet processing and captured in the image domain from an appropriate synthesized image. Co-occurrence matrices are used to derive texture descriptors by modeling second order statistics of color image levels. These descriptors ...
Comparative foraging ecology of a tropical seabird community of the Seychelles,...
Catry, Teresa; Ramos, Jaime A.; Jaquemet, Sébastien; Faulquier, Lucie; Berlincourt, Maud; Hauselmann, Antoine; Pinet, Patrick; Le Corre, MatthieuWe studied the foraging ecology of a tropical seabird community in 2 islands of the Seychelles from 2005 to 2007. Chick dietary samples were used to compare feeding habits among species and assess inter-annual and seasonal variations in diet. Fish prey dominated the diet of the community (68 to 100% of prey consumed), although cephalopods were present in 61.3, 40.0, 27.1 and 32.9% of the food samples from white...
Wireless capsule endoscopic frame classification scheme based on higher order s...
Barbosa, Daniel; Ramos, Jaime; Lima, C. S.The gastrointestinal (GI) tract is a long tube, prone to all kind of lesions. The traditional endoscopic methods do not reach the entire GI tract. Wireless capsule endoscopy is a diagnostic procedure that allows the visualization of the whole GI tract, acquiring video frames, at a rate of two frames per second, while travels through the GI tract, propelled by peristalsis. These frames possess rich information a...
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