Browsing by Issue Date, starting with "2020-04-14"
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- Fasoscópio - pequenos cientistas em casaPublication . equipa CCVAlgPequenos Cientistas em Casa Acompanha as atividades que o Centro Ciência Viva do Algarve publica para poderes fazer em casa. Diverte-te em família, fazendo as nossas atividade e partilha connosco os resultado através de fotografias ou vídeo. #PequenosCientistasEmCasa #PequenosCientistasCCVAlg HOJE: Fasoscópio Ver as fases da Lua ou de Vénus, ajudou a compreender como Vénus teria que orbitar o Sol e não a Terra! Com esta atividade vais poder construir um "Fasoscópio" que te permite ver qualquer fase da Lua de formar realista. ATENÇÃO!! Não saias de casa para adquirir nenhum destes materiais. Se não os tiveres todos, aguarda pelo nosso próximo desafio! #PequenosCientistasEmCasa #PequenosCientistasCCVAlg #ccvalg #cienciaviva #cienciavivaemcasa #ficaemcasa #visao #lua #astronomia
- Cladocora caespitosa and Cystoseira spp.: description of a new habitat and interactions coral/algae in mixed assemblagesPublication . Fita, Alèssia Pons; Serrão, Ester; Ballesteros, EnricZooxanthellate corals and benthic macroalgae that overlap in the same habitat compete for limiting resources such as light and space and have physical and chemical clues to outcompete each other. There is a huge amount of literature based on coral-algal interactions that endorse the general assumption about the negative outcomes on corals once the algae proliferate due to increased nutrient loads or decreasing herbivory rates. Here we have discovered and characterized a new and unique Mediterranean habitat where the reef-building coral Cladocora caespitosa and erect seaweeds of the order Fucales (Cystoseira s. l.) coexist. In this new habitat Cladocora caespitosa reaches 34% cover and densities of Cystoseira s. l. (mainly Treptacantha ballesterosii) are much higher than reports from other sites provided by different authors. Interestingly, abundances of Treptacantha ballesterosii and Cladocora caespitosa show a positive relationship suggesting that some kind of facilitation mechanism is taking place. Comparing these Cladocora-Cystoseira s. l. relationships with other places where these taxa coexist, reveals that these relationships are species- and site-specific, although most of them are neutral or positive. Despite the mechanisms mediating coral-algae interactions are being poorly understood, description of positive to neutral long-lasting relationships between these principal Mediterranean habitat-formers challenges the expected competition for space between corals and macroalgae.
- Proto-Solutrean lithic technology of western Iberia: the sites of Vale Boi and Lapa do PicareiroPublication . Belmiro, Joana Filipa Neto; Cascalheira, JoãoThe present study aims to answer the question: what impact did the Heinrich event 2 have on the technological organization of human communities, at the onset of the Last Glacial Maximum, in south western Iberia? The impact of this event on the Gravettian-Solutrean transition has been previously suggested (Bradtmöller et al. 2012). However, the existing models do not consider the Proto-Solutrean technocomplex as an individual phase for this transition (Cascalheira & Bicho 2013). To address this question, this study analysed the lithic assemblages from Layers 5 and 4E of the site of Vale Boi (southern Portugal) and Levels U and T from Lapa do Picareiro (central Portugal). We aimed to understand the technological patterns and raw material exploitation during the Proto-Solutrean, and test the existing models with assemblages from recently excavated sites, while expanding the geographic range. The analysis followed a technological attributes approach. The retrieved data was fully analysed in R environment. Results show the existence of two discrete phases in each site. The first, with high frequency of quartz use for bladelet production, seems to reflect the presence, in both sites, of a Terminal Gravettian horizon, as defined by Almeida (2000). The second, with some significant differences between sites, attests the presence of Vale Comprido technology and lower quartz frequencies at Vale Boi, representing a Proto-Solutrean occupation; and the presence of a blade component in Lapa do Picareiro that, together with the respective absolute chronology, may attributed to a Proto-Solutrean or an Early Solutrean horizon. In general terms, this study allowed to confirm that the Terminal Gravettian and the Proto-Solutrean are discrete phases across the transiton, in concordance with the Three-Phase model presented by Zilhão (1997a). It further consolidates the expansion of similar techno-cultural patterns to southern Portugal, that may be explained by the expansion of social networks (Cascalheira & Bicho 2013). Associated with the dominance of different technological patterns and intensive use of quartz, we may understand these horizons as a moment of cultural reorganization, onset by environmental pressures.