In recent years, the global distribution of phytoplankton functional types (PFT) and phytoplankton size classes (PSC) has been determined by remote sensing. Many of these methods rely on interpretation of phytoplankton size or type from pigment data, but independent validation has been difficult due to lack of appropriate in situ data on cell size. This work uses in situ data (photosynthetic pigments concentration and cell abundances) from the north-east Atlantic, along a trophic gradient, sampled from 2005 to 2010, as well as Atlantic Meridional Transect (AMT) data for the same region, to test a previously developed conceptual model, which calculates the fractional contributions of pico-, nano-and micro-plankton to total phytoplankton chlorophyll biomass (Brewin et al., 2010). The application of the model proved to be successful, as shown by low mean absolute error between data and model fit. However, regional values obtained for the model parameters had some effect on the relative distribution of size classes as a function of chlorophyll-a, compared with the results according to the original model. The regional parameterisation yielded a dominance of micro-plankton contribution for chlorophyll-a concentrations greater than 0.5 mg m −3 , rather than from 1.3 mg m −3 in the original model. Intracellular chlorophyll-a (Chla) per cell, for each size class, was computed from the cell enumeration results (microscope counts and flow cytometry) and the chlorophyll-a concentration for that size class given by the model. The median intracellular chlorophyll-a values computed were 0.004, 0.224 and 26.78 pg Chla cell −1 for pico-, nano-, and micro-plankton respectively. This is generally consistent with the literature, thereby providing an indirect validation of the method based on pigments to assign size classes. Using a satellite-derived composite image of chlorophyll-a for the study area, a map of cell abundance was generated based on the computed intracellular chlorophyll-a for each size-class, thus extending the remote-sensing method for mapping size classes of phytoplankton from chlorophyll-a concentration to mapping cell numbers in each class. The map reveals the ubiquitous presence of pico-plankton, and shows that all size classes are more abundant in more productive areas.

During summer 2008 and spring 2009, surface oceanographic surveys were carried out around three islands of the Azores archipelago (Terceira, São Miguel and Santa Maria) to assess the phytoplankton distribution and associated physico-chemical processes. The Azores archipelago is a major feature in the biogeochemical North Atlantic Subtropical Gyre (NAST) province although its influence on the productivity of the surrounding ocean is poorly known. Surface phytoplankton was studied by microscopy and HPLC (High Precision Liquid Chromatography). The mean values for biomass proxy Chlorophyll a (Chla) ranged from 0.04 to 0.55 mg L À1 (Chla maximum ¼ 0.86 mg L À1) and coccolithophores were the most abundant group, followed by small flagellates, Cyanobacteria, diatoms and dinoflagellates being the least abundant group. The distribution of phytoplankton and coccolithophore species in particular presented seasonal differences and was consistent with the nearshore influence of warm subtropical waters from the south Azores current and colder subpolar waters from the north. The satellite-derived circulation patterns showed southward cold water intrusions off Terceira and northward warm water intrusions off Santa Maria. The warmer waters signal was confirmed by the subtropical coccolithophore assemblage, being Discosphaera tubifera a constant presence under these conditions. The regions of enhanced bio-mass, either resulting from northern cooler waters or from island induced processes, were characterized by the presence of Emiliania huxleyi. Diatoms and dinoflagellates indicated coastal and regional processes of nutrient enrichment and areas of physical stability, respectively.

Este artigo é uma reflexão coletiva do Núcleo de Estudos e Pesquisas sobre Movimentos Sociais (Nemos) do Programa de Estudos Pós-Graduados em Serviço Social da Pontifícia Universidade Católica de São Paulo, a partir dos conceitos de Scherer-Warren sobre Redes e Movimentos Sociais. As reflexões apontam para uma agenda de pesquisa que repense as novas configurações dos movimentos sociais no século XXI, suas relações com o Estado e partidos políticos e suas articulações políticas e diversidade de composição.

ResumoOs conflitos gerados por mineração, em área urbana, ocorrem devido a diversos motivos. Procurou-se identificar os atores sociais e a dinâmica dos conflitos na região noroeste do município de São Paulo, área que concentra aspectos de preservação ambiental com atividade de pedreiras produtoras de agregados para construção civil, constituindo-se, ainda, em uma região com densa ocupação urbana. Para que esses conflitos sejam minimizados/solucionados, propõem-se estratégias de negociação, de participação e de aprendizagem social. Palavras-chave:Pedreiras em área urbana, conflitos socioambientais, aprendizagem social, Perus. AbstractThe conflicts generated by mining in urban areas are due to several reasons. In this paper we sought to identify the social actors and the dynamics of conflicts in the northwestern region of the São Paulo Municipality. This area presents aspects of environmental preservation, quarry activities, and dense urbanization. To minimize/ solve these conflicts, strategies are proposed based on Social Learning methodologies.

RESUMOApresenta-se a reformulação de uma proposta de Universidade Aberta à Terceira Idade (UATI) ocorrida no campus Baixada Santista da Universidade Federal de São Paulo (UNIFESP), reconstituindo sua história e seu processo político-pedagógico na perspectiva dos princípios de ensino público e gratuito, de educação intergeracional e de integração dos idosos às atividades do campus. Apresentam-se também as características da cidade de Santos quanto à população de idosos, e discute-se o papel da universidade em relação a ela. O relato da experiência aponta para a possibilidade de uma UATI integrada ao campus, com baixo custo operacional e ampla participação universitária. Entretanto, também são relatadas dificuldades, como a ausência de espaços estáveis ou próprios para as aulas e guarda de materiais e arquivos. Por fim, apontam-se os horizontes que puderam se abrir com esta proposta, que parecem mostrar o potencial da UATI no favorecimento da vocação universitária pela pesquisa, pelo ensino e pela extensão. PALAVRAS-CHAVE: