Browsing by Author "Veiga-Pires, Cristina"
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- 1st METECH workshop – From deep-sea to coastal zones: Methods and Techniques for studying PalaeoenvironmentsPublication . Veiga-Pires, Cristina; Guillaume St-OngeReconstructing past climate and past ocean circulation demands the highest possible precision and accuracy which urges the scientific community to look at different sediment records such as the ones from coastal zones to deep-sea with a more complete set of technical and methodological tools. However, the information given by each tool varies in precision, accuracy and in significance according to their environmental settings. It is therefore essential to compare tools. With that in mind, and as part of the International year of Planet Earth, a workshop entitled `From deep-sea to coastal zones: Methods and Techniques for studying palaeoenvironments' took place in Faro (Portugal), from 25–29 February 2008.
- Atividade "Tinkering" uma ferramenta para a inclusão socialPublication . Gonçalves, Luis; Ramos, Alexandra; Antunes, Andrea; Coelho, Aurora; Miguel, Carlos; Veiga-Pires, Cristina; Fernandes, David; Reis, Emanuel; Afonso, João; Oliveira, Jorge; Freitas, Ricardo; Borges, Rita; David, Rute; Ventura, Telmo; Gamboa, VitorO Projeto C4 – Crianças C com Ciência baseia-se na apropriação pelas crianças C de conceitos científicos e tecnológicos, não pela aquisição de conhecimentos per se mas sim pelo despertar do interesse para esses conceitos e pela pertinência e necessidade da sua aquisição. Durante o ano letivo 2017/2018 desenvolveram-se sessões de Tinkering com duas turmas de 1º ano da Escola da Lejana, em Faro. A avaliação feita na escola deu resultados bastante positivos, ainda sustentados pelo êxito das atividades desenvolvidas pelas crianças de etnia cigana para a comunidade em geral (https://www.facebook.com/criancasccomciencia/). Esta apresentação consiste assim num balanço final do referido projeto nas diferentes vertentes comportamentais, sociais e científicas, que o mesmo abordou através das atividades realizadas.
- The Escarpão Plateau (South of Portugal)—a study case of nested geosites from the aspiring Algarvensis GeoparkPublication . Veiga-Pires, Cristina; Jenkins Oliveira Fernandes, Sónia Alexandra; Moura, Delminda; Pereira, LuísFlatfish species seem to require dietary taurine for normal growth and development. Although dietary taurine supplementation has been recommended for flatfish, little is known about the mechanisms of taurine absorption in the digestive tract of flatfish throughout ontogeny. This study described the cloning and ontogenetic expression of the taurine transporter (TauT) in the flatfish Senegalese sole (Solea senegalensis). Results showed a high similarity between TauT in Senegalese sole and other vertebrates, but a change in TauT amino acid sequences indicates that taurine transport may differ between mammals and fish, reptiles or birds. Moreover, results showed that Senegalese sole metamorphosis is an important developmental trigger to promote taurine transport in larvae, especially in muscle tissues, which may be important for larval growth. Results also indicated that the capacity to uptake dietary taurine in the digestive tract is already established in larvae at the onset of metamorphosis. In Senegalese sole juveniles, TauT expression was highest in brain, heart and eye. These are organs where taurine is usually found in high concentrations and is believed to play important biological roles. In the digestive tract of juveniles, TauT was more expressed in stomach and hindgut, indicating that dietary taurine is quickly absorbed when digestion begins and taurine endogenously used for bile salt conjugation may be recycled at the posterior end of the digestive tract. Therefore, these results suggest an enterohepatic recycling pathway for taurine in Senegalese sole, a process that may be important for maintenance of the taurine body levels in flatfish species.
- The escarpão plateau (South of Portugal)—a study case of nested geosites from the aspiring Algarvensis geoparkPublication . Veiga-Pires, Cristina; Jenkins Oliveira Fernandes, Sónia Alexandra; Moura, Delminda; Pereira, LuísLocated along the southern limit of the Algarvensis aspiring UNESCO Global Geopark (aUGGp), the Escarpão Plateau is a singular geomorphological structure sculpted by fluvial, karst, and tectonic processes. The plateau is deeply scarved by the Quarteira Rivulet, forming a valley that crosses the most complete Upper Jurassic sedimentary sequence of the Eastern Algarve (Southern Portugal). This sequence includes five geological formations representing different depths of carbonate ramp deposition from the Tethys Sea: Peral Formation, Jordana Formation, Cerro da Cabeça Formation, Escarpão Formation, and the upper Limestone Formation with Anchispirocyclina lusitanica (foraminifera), respectively from the oldest formation to the most recent at the top. Throughout the Quaternary Period, the karst processes shaped a landscape of sparse and poor soils, based on which successive generations adapted their subsistence agriculture and way of life. The geomorphology of the plateau and the rivulet valley, the sequence of the carbonated formations, and the diversity of sedimentary and paleontological records can be considered possible sites of diverse geological interest and with different scales that are embedded in each other, forming thus nested sites. To promote and preserve these sites, the Algarvensis aUGGp shaped an 8-km-long interpretative walking path, passing through 11 points of interest, including biosites and geosites. Their interpretative boards highlight not only the different spatial and temporal geological diversity but also its relationship with surrounding cultural and historical heritage. Finally, this work allowed the creation of new products for outreach and public awareness towards an effective geoconservation.
- Familias Exploradoras - Caminos que cuentan | Faro - Vila AdentroPublication . Fernandes, Susana; Santos, Maria da Conceição; Nobre, Sandra; Ludovico, Olga; Veiga-Pires, Cristina; Reis, Emanuel; Gonçalves, Luis; Manhita, Jorge; Beja, Nuno; Guerreiro, Carla
- Familles Exploratrices - Parcours qui comptent | Faro - Vila AdentroPublication . Fernandes, Susana; Santos, Maria da Conceição; Nobre, Sandra; Ludovico, Olga; Veiga-Pires, Cristina; Reis, Emanuel; Colaço, Ana; Gonçalves, Luis; Manhita, Jorge; Beja, Nuno; Guerreiro, Carla
- From a marsh that was once sea: the geological evolution of Europe's largest biological reserve as told by its benthic foraminifera-a reviewPublication . González-Regalado, María Luz; Guerra, Liliana; Ruiz, Francisco; Veiga-Pires, Cristina; Abad, Manuel; Izquierdo, Tatiana; Vidal, Joaquín Rodríguez; Cáceres, Luis Miguel; Muñiz, Fernando; Carretero, María Isabel; Tosquella, Josep; Muñoz, Adolfo Francisco; Pozo, Manuel; Muñoz, Juan Manuel; Toscano, Antonio; Gómez, Paula; Romero, Verónica; Gómez, GabrielThis paper presents an updated list of benthic foraminifera found in brackish and marine (paleo-)environments of the Donana National Park (SW Spain) from the Lower Pliocene to the present-day. This list, based on published records, includes ninety-four species whose autoecology and temporal distribution in surface sections and continuous sediment cores allow us to infer the palaeogeographic evolution of this Biosphere Reserve over the last millions of years. During the Lower Pliocene, this area was occupied by a wide shallow bay with Nonion faba and Ammonia beccarii as the most representative species. During the Upper Pliocene, there was a transition to terrestrial environments, later dominated by fluvial dynamics for much of the Pleistocene and devoid of these aquatic microorganisms. During the Upper Pleistocene and part of the Holocene, the park was flooded during the MIS-1 transgression and a large lagoon was formed and progressively silted up. At this stage, benthic foraminiferal assemblages were dominated by the brackish species Ammonia morphogroup tepida and Haynesina germanica, which were occasionally replaced by marine species (mainly miliolids) during high-energy events. Currently, benthic foraminifera are mainly represented by Ammonia morphogroup tepida in the temporary lagoons and distributary channels, while Ammonia beccarii is dominant in their marginal marine areas. In summary, there is a clear correspondence between the palaeogeographic evolution of the park and its benthic foraminiferal associations, a review of which contributes to increase the knowledge of its remarkable present and past faunal diversity.
- Global reorganization of atmospheric circulation during Dansgaard–Oeschger cyclesPublication . Jens Fohlmeister; Natasha Sekhon; Andrea Columbu; Guido Vettoretti; Nils Weitzel; Kira Rehfeld; Maya Ben-Yami; Norbert Marwan; Niklas Boers; Veiga-Pires, CristinaIce core records from Greenland provide evidence for multiple abrupt cold-warm-cold events recurring at millennial time scales during the last glacial interval. Although climate variations resembling Dansgaard- Oeschger (DO) oscillations have been identified in climate archives across the globe, our understanding of the climate and ecosystem impacts of the Greenland warming events in lower latitudes remains incomplete. Here, we investigate the influence of DO-cold-to-warm transitions on the global atmospheric circulation pattern. We comprehensively analyze delta O-18 changes during DO transitions in a globally distributed dataset of speleothems and set those in context with simulations of a comprehensive high-resolution climate model featuring internal millennial-scale variations of similar magnitude. Across the globe, speleothem delta O-18 signals and model results indicate consistent large-scale changes in precipitation amount, moisture source, or seasonality of precipitation associated with the DO transitions, in agreement with northward shifts of the Hadley circulation. Furthermore, we identify a decreasing trend in the amplitude of DO transitions with increasing distances from the North Atlantic region. This provides quantitative observational evidence for previous suggestions of the North Atlantic region being the focal point for these archetypes of past abrupt climate changes.
- Late holocene benthic Foraminifera of the Roman Lacus ligustinus (SW Spain): a paleoenvironmental approachPublication . Guerra, Liliana; Veiga-Pires, Cristina; Luz Gonzalez Regalado, M. L.; Abad, M.; Toscano, A.; Manuel Munoz, J. M.; Ruiz, F.; Vidal, J. R.; Caceres, L. M.; Izquierdo, T.; Carretero, M. I.; Pozo, M.; Monge, G.; Tosquella, J.; Prudencio, M. I.; Dias, M.I.; Marques, R.; Gomez, P.; Romero, V.This paper studies the Late Holocene benthic foraminifera from a continuous core extracted in the Doliana National Park (SW Spain). In this core, the foraminiferal assemblages confirm the Late Holocene lagoon (historically so-called Locus Ligustinus) during the Roman period, about 2000 years ago. The more open, deepest areas of this lagoon were dominated by Ammonia tepida and Elphidium spp., while Haynesina germanise was the most representative species of the shallow, more restricted zones. The vertical variations of these assemblages, together with associated sedimentological and macrofaunal changes, allow recognizing three high-energy events (HEE) between 500 BCE and 500 CE, which also left an extensive sedimentary record in nearby coastal areas: two tsunamis (HEE-1 and HEE-3) and a storminess period (HEE-2).
- Offshore 1755 CE Lisbon Tsunami deposit in the southern portuguese continental shelfPublication . Kümmerer, Vincent; Drago, Teresa; Veiga-Pires, Cristina; Silva, Pedro; Lopes, Ana; Magalhães, Vitor; Roque, Cristina; Rodrigues, Ana Isabel; Terrinha, Pedro; Mena, Anxo; Francés, Guillermo; Kopf, Achim; Völker, David; Salgueiro, Emilia; Alberto, Ana; C. Lopes, Cristina; Costa, Pedro; Baptista, Maria AnaThe importance of tsunami hazard assessment is only possible if a complete dataset of events is available, allowing the determination of the recurrence intervals of the tsunamis adapted to local and regional conditions. One possible way to know these intervals is to study the offshore sedimentary record, looking for sediment remobilised and transported by the incoming tsunami waves and generated backwash currents. Even if these deposits are not of easy access (and not so well studied), the tsunami depositional signature has potential to be better preserved than those located onshore.