23 documents found, page 1 of 3
Middle Jurassic dinosaur footprints from the Serras de Aire and Candeeiros [Res...
Lopes, Luis; Sá, Artur Abreu; Carvalho, Jorge; Mergulhão, Lia; Cachão, Mário; Galopim de Carvalho, António MarcosABSTRACT: The Dinosaur Footprints Natural Monument of Ourém/Torres Novas, known as Galinha quarry, and the Vale de Meios quarry, are located in the Serras de Aire e Candeeiros Nature Park (Central Portugal). They are two geosites, duly geoconserved, of recognized international scientific value, due to its exceptionality regarding to the age, size, and quality of preservation of ichnites. Both quarries are locat...
Aurochs roamed along the coast of SW Spain (Iberia) during Late Pleistocene
Neto de Carvalho, Carlos; Muñiz, Fernando; Cáceres, Luis M.; Belaústegui, Zain; Rodríguez‑Vidal, Joaquín; Belo, João; Moreira, Noel; Cachão, MárioIn the Iberian Peninsula the fossil record of artiodactyls spans over 53 million years. During the Pleistocene, wild cattle species such as Bison and especially Bos became common. In Late Pleistocene, the aurochs (Bos primigenius) was widespread and the only bovine living along the large river valleys of southern Iberia. Although commonly found in fossil sites and especially in cave bone assemblages, the trace ...
Characterization of the coccolithophore community off Cabo Verde archipelago, i...
Narciso, Áurea; Javidpour, Jamileh; Chi, Xupeng; Cachão, Mário; Kaufmann, ManfredA systematic investigation of the extant coccolithophore community around Cabo Verde archipelago was per formed during the cruise MSM49 of RV Maria S. Merian, which took place in the late fall of 2015. The description of the spatial and vertical distributions of coccolithophores was based on a survey performed to the north, east and south of Cabo Verde archipelago, between the surface and 150 m water depth. The...
O mar de Olisipo
Costa, Ana Maria; Freitas, Maria Conceição; Bugalhão, Jacinta; Cachão, Mário; Currás, Andréso estuário do Tejo é um dos maiores estuários da Europa ocidental cobrindo uma área de cerca de 325 km2 de extensão. A incisão do vale onde se desenvolve ocorreu durante os vários períodos glaciares do Quaternário e finalmente durante o Último Máximo Glacial, dando origem a um vale que atinge profundidades superiores a 80 m. Esta depressão morfológica é inundada por águas marinhas durante a rápida subida do niv...
The effect of a transient frontal zone on the spatial distribution of extant co...
Narciso, Áurea; Caldeira, Rui; Reis, Jesus; Hoppenrath, Mona; Cachão, Mário; Kaufmann, ManfredIn order to characterize the coccolithophore community around the Madeira archipelago and to understand the effect of a transient frontal zone on its distribution, 149 seawater samples from the first 150 m were collected in 37 stations, during the research cruise POS466 of RV Poseidon. The present study revealed the occurrence of two biogeographic domains, NE and SW, during the late winter of 2014, with distinc...
The role of climate, marine influence and sedimentation rates in late-Holocene ...
Costa, Ana Maria; Freitas, Maria da Conceição; Leira, Manel; Costas, Susana; Costa, Pedro JM; Andrade, César; Bao, Roberto; Duarte, JoãoEstuaries are sensitive to changes in global to regional sea level, to climate-driven variation in rainfall and to fluvial discharge. In this study, we use source and environmentally sensitive proxies together with radiocarbon dating to examine a 7-m-thick sedimentary record from the Sado estuary accumulated throughout the last 3.6 kyr. The lithofacies, geochemistry and diatom assemblages in the sediments accum...
Nutrient-specific responses of a phytoplankton community: a case study of the N...
Ramos, J. Barcelos e; Schulz, Kai G.; Voss, Maren; Narciso, Áurea; Müller, Marius N.; Reis, Francisco V.; Cachão, Mário; Azevedo, Eduardo B.Nutrient concentrations are unevenly distributed in the oceans, influencing the abundance and composition of phytoplankton communities. Even so, the dominant driving factors responsible for variability between phytoplank ton communities are still unclear. In the North Atlantic Gyre, the Azores present a good opportunity to study phytoplankton communities of oligotrophic areas that experience nutrient pulses. We...
Seasonal and interannual variations in coccolithophore abundance off Terceira I...
Narciso, Áurea; Gallo, Francesca; Valente, Andre; Cachão, Mário; Cros, Lluïsa; Azevedo, Eduardo B.; e Ramos, Joana BarcelosIn order to characterize the natural coccolithophore community occurring offshore Azores and to determine their annual and interannual patterns, monthly samples were collected, from September 2010 to December 2014, in the photic zone off Terceira Island. The present study revealed a clear seasonal distribution and a considerable interannual variability of the living coccolithophore community. The highest coccol...
Seasonal and interannual variations in coccolithophore abundance off Terceira I...
Narciso, Áurea; Gallo, Francesca; Valente, André; Cachão, Mário; Cros, Lluïsa; Azevedo, Eduardo B.; Ramos, Joana BarcelosIn order to characterize the natural coccolithophore community occurring offshore Azores and to de-termine their annual and interannual patterns, monthly samples were collected, from September 2010 toDecember 2014, in the photic zone off Terceira Island.The present study revealed a clear seasonal distribution and a considerable interannual variability of theliving coccolithophore community. The highest coccolit...
The emergence of volcanic oceanic islands on a slow-moving plate: the example o...
Ramalho, Ricardo S.; Silveira, António Brum da; Fonseca, Paulo E.; Madeira, José; Cosca, Michael; Cachão, Mário; Fonseca, Maria M.; Prada, Susana N.<jats:title>Abstract</jats:title><jats:p>The transition from seamount to oceanic island typically involves surtseyan volcanism. However, the geological record at many islands in the NE Atlantic—all located within the slow‐moving Nubian plate—does not exhibit evidence for an emergent surtseyan phase but rather an erosive unconformity between the submarine basement and the overlying subaerial shield sequences. Th...