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| Almeida,Teodoro I. R; Calijuri,Maria do Carmo; Falco,Patrícia B; Casali,Simone P; Kupriyanova,Elena; Paranhos Filho,Antonio C; Sigolo,Joel B; Bertolo,Reginaldo A. |
| The Pantanal of Nhecolândia, the world's largest and most diversified field of tropical lakes, comprises approximately 10,000 lakes, which cover an area of 24,000 km² and vary greatly in salinity, pH, alkalinity, colour, physiography and biological activity. The hyposaline lakes have variable pHs, low alkalinity, macrophytes and low phytoplankton densities. The saline lakes have pHs above 9 or 10, high alkalinity, a high density of phytoplankton and sand beaches. The cause of the diversity of these lakes has been an open question, which we have addressed in our research. Here we propose a hybrid process, both geochemical and biological, as the main cause, including (1) a climate with an important water deficit and poverty in Ca2+ in both superficial and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pantanal; Alkaline lakes; Saline lakes; Cyanobacteria; Alkalinization processes. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200004 |
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| Beghelli,Frederico Guilherme de Souza; Santos,André Cordeiro Alves dos; Urso-Guimarães,Maria Virgínia; Calijuri,Maria do Carmo. |
| The purpose of this work was to verify the benthic macroinvertebrates community responses through environmental factors along a headwater tropical reservoir. Samplings were taken with a Van-Veen grab along the reservoir in littoral and profundal regions and in the headwater, next to the dam and the middle of the reservoir. Samples were taken during both wet and dry seasons. Dissolved oxygen concentrations, electric conductivity, temperature and pH near the sediment have been performed in situ, at every sampling station by using a multiprobe and Secchi disc. Total water phosphorus and chlorophyll a concentrations were analyzed to determine the trophic state index. Sediment's organic matter, total phosphorus, nitrogen concentrations and granulometric... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Benthos; Chironomidae; Limnology; Bioindicator; Water quality. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000400012 |
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| Taniwaki,Ricardo Hideo; Borghi,Tatiana Cintra; Magrin,Albano Geraldo Emílio; Calijuri,Maria do Carmo; Bottino,Flávia; Moschini-Carlos,Viviane. |
| Much remains to be learned about biological diversity, which constitutes a valuable natural resource. Due to the pressure that human activity has put on natural resources, biodiversity has been reduced, often unbeknownst to those responsible for that activity. Therefore, we aimed to perform a quantitative and qualitative analysis of periphytic algae in the Itupararanga reservoir, correlating the results with the physical and chemical characteristics of the water, as well as with climatic conditions. To that end, five samples were collected at four sampling stations in the Itupararanga reservoir during the year 2010. Aquatic macrophytes were collected with a 156-cm² frame, and the periphytic algae were scraped free of the macrophytes with a brush. Samples... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Periphyton; Macrophytes; Water quality; Detrended correspondence analysis; Principal components analysis. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000300013 |
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| Cunha,Davi Gasparini Fernandes; Calijuri,Maria do Carmo. |
| A análise dos grupos funcionais fitoplanctônicos em sistemas aquáticos pode oferecer subsídios à conciliação dos usos múltiplos. Essa pesquisa investigou a variação sazonal desses grupos no reservatório de Itupararanga (SP). Quatro braços foram amostrados para determinação de temperatura da água, pH, Radiação Solar Fotossinteticamente Ativa Subaquática (RSFA), turbidez, fósforo total, nitrato e sólidos suspensos totais (SST), além da contagem e identificação do fitoplâncton e análise de dados meteorológicos. O estudo, realizado em agosto e outubro de 2009 e fevereiro de 2010, sugeriu variação sazonal dos grupos fitoplanctônicos (p*<0,05), com predominância de organismos Sn, X1, M e F (inverno), X1, Y, F e K (primavera) e X1, J, K e W2 (verão). No... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacia do rio Sorocaba; Comunidade fitoplanctônica; Eutrofização; Recursos hídricos; Sistemas lênticos. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000400009 |
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