Resposta do perifíton aos pulsos de enriquecimento em níveis crescentes de fósforo e nitrogênio em represa tropical mesotrófica (Lago das Ninféias, São Paulo)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Análise da variação espaço-temporal em diferentes escalas sobre a distribuição ecológica das comunidades de macroalgas de duas bacias de drenagem da região centro-sul do estado do Paraná

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Diversidade específica e de hábitat dos Cosmarium de parede lisa (Zygnemaphyceae) do estado de São Paulo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estrutura e dinâmica da comunidade fitoplanctônica no período de cinco anos em ambiente mesotrófico (Lago das Ninfeias), Parque Estadual das Fontes do Ipiranga, São Paulo

Pós-graduação em Ciências Biológicas (Biologia Vegetal) - IBRC

Avaliação sazonal dos efeitos do enriquecimento por N e P sobre o perifíton em represa tropical rasa mesotrófica (Lago das Ninféias, São Paulo)

Pós-graduação em Ciências Biológicas (Biologia Vegetal) - IBRC

Biossorção de terras-raras por Sargassum sp: estudos preliminares sobre as interações metal-biomassa e a potencial aplicação do processo para a concentração , recuperação e separação de metais de alto valor agregado em colunas empacotadas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Palinoestratigrafia na passagem do grupo Itararé ao Guatá (carbonífero-permiano) no sul do Estado do Paraná e norte do Estado de Santa Catarina, borda leste da Bacia do Paraná

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Liquens de Mato Grosso do Sul: estudo químico e avaliação da atividade biológica

Pós-graduação em Química - IQ

Influência dos fatores ambientais na organização da comunidade de macroinvertebrados bentônicos em riachos tropicais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

História natural e ecologia de duas taxocenoses de serpentes na Mata Atlântica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Taxonomia, distribuição e biologia reprodutiva de Ophiuroidea (Echinodermata) das regiões Sudeste e Sul do Brasil

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Distribuição ecológica e dinâmica populacional do camarão barriga branca Nematopalaemon schmitti (Holthuis, 1950) (Caridea, Palaemonidae) na região de Macaé-RJ, Brasil

Pós-graduação em Ciências Biológicas (Zoologia) - IBB

Estudo taxonômico e anatômico em espécies de Canoparmelia s.l. (Parmeliaceae, Ascomycota liquenizados)

Pós-graduação em Ciências Biológicas (Botânica) - IBB

Progressive recovery of a tropical deforested stream community after a flash flood

AIM: In this study, we evaluated and compared community attributes from a tropical deforested stream, located in a pasture area, in a period before (PRED I) and three times after (POSD I, II, and III) a flash flood, in order to investigate the existence of temporal modifications in community structure that suggests return to conditions previous to the flash flood. METHODS: Biota samples included algae, macrophytes, macroinvertebrates, and fish assemblages. Changes in stream physical structure we also evaluated. Similarity of the aquatic biota between pre and post-disturbance periods was examined by exploratory ordination, known as Non-Metric Multidimensional Scaling associated with Cluster Analysis, using quantitative and presence/absence Bray-Curtis similarity coefficients. Presence and absence data were used for multivariate correlation analysis (Relate Analysis) in order to investigate taxonomic composition similarity of biota between pre and post-disturbance periods. RESULTS: Our results evidenced channel simplification and an expressive decrease in richness and abundance of all taxa right after the flood, followed by subsequent increases of these parameters in the next three samples, indicating trends towards stream community recovery. Bray-Curtis similarity coefficients evidenced a greater community structure disparity among the period right after the flood and the subsequent ones. Multivariate correlation analysis evidenced a greater correlation between macroinvertebrates and algae/macrophytes, demonstrating the narrow relation between their recolonization dynamics. CONCLUSIONS: Despite overall community structure tended to return to previous conditions, recolonization after the flood was much slower than that reported in literature. Finally, the remarkably high flood impact along with the slow recolonization could be a result of the historical presence of anthropic impacts in the region, such as siltation, riparian forest complete depletion, and habitat simplification, which magnified the effects of a natural disturbance.

Cyanobacteria detection in Guarapiranga Reservoir (São Paulo State, Brazil) using Landsat TM and ETM+ images

Algae bloom is one of the major consequences of the eutrophication of aquatic systems, including algae capable of producing toxic substances. Among these are several species of cyanobacteria, also known as blue-green algae, that have the capacity to adapt themselves to changes in the water column. Thus, the horizontal distribution of cyanobacteria harmful algae blooms (CHABs) is essential, not only to the environment, but also for public health. The use of remote sensing techniques for mapping CHABs has been explored by means of bio-optical modeling of phycocyanin (PC), a unique inland waters cyanobacteria pigment. However, due to the small number of sensors with a spectral band of the PC absorption feature, it is difficult to develop semi-analytical models. This study evaluated the use of an empirical model to identify CHABs using TM and ETM+ sensors aboard Landsat 5 and 7 satellites. Five images were acquired for applying the model. Besides the images, data was also collected in the Guarapiranga Reservoir, in São Paulo Metropolitan Region, regarding the cyanobacteria cell count (cells/mL), which was used as an indicator of CHABs biomass. When model values were analyzed excluding calibration factors for temperate lakes, they showed a medium correlation (R²=0.81, p=0.036), while when the factors were included the model showed a high correlation (R²=0.96, p=0.003) to the cyanobacteria cell count. The empirical model analyzed proved useful as an important tool for policy makers, since it provided information regarding the horizontal distribution of CHABs which could not be acquired from traditional monitoring techniques.