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| Lima, Paulo de Freitas; Sousa, Mart Som Reis; Porfírio, André Ferreira; Almeida, Beatriz Soares; Freire, Rogério Herlon Furtado; Santaella, Sandra Tédde. |
| The Carlson’s (1977) Trophic State Index (TSI) is a widely employed tool to estimate the degree of eutrophication in a reservoir. In Brazil, the need of a classification system that would take into account regional characteristics employed adjusted indexes generated by data from reservoirs in the southeastern region of the country. Current research compares responses for Carlson’s TSI (1977) and its derivations for Brazilian reservoirs from data collected in the Pereira de Miranda Reservoir (State of Ceará, Brazil), and analyzes the influence of local conditions on results and their applicability to reservoirs in the semiarid region. TSIs were calculated by data on total phosphorus, chlorophyll a and water transparency. The reservoir was estimated as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ciências biológicas; Ecologia (2.05.00.00-9) hydro-climatic conditions; Eutrophication; Limiting nutrient; Phosphorus; Nitrogen; Chlorophyll a Ecologia de ecossistemas (2.05.02.00-1). |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/27160 |
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| Leblanc, K; Queguiner, B; Garcia, N; Rimmelin, P; Raimbault, P. |
| A study of the biogeochemical cycle of silicon has been conducted in the Gulf of Lion (NW Mediterranean) from September 1999 to September 2000. Most of the year the study site was under the influence of the NW Mediterranean Current, characterized by oligotrophic conditions. A seasonal pattern of silicon stocks was found, showing an inverse annual distribution of biogenic silica and lithogenic silica. Biogenic silica integrated stocks were higher during spring and summer (21.5 and 19.3 mmol m(-2)) due to siliceous phytoplankton Si uptake and build-up of biomass. By contrast lithogenic silica integrated stocks were highest during the fall and winter (61.8 and 45.0 mmol m(-2)), which may be explained by a higher degree of turbulence of the water column,... |
| Tipo: Text |
Palavras-chave: NW Mediterranean; Biogenic silica; Phytoplanktonic community; Limiting nutrient; Seasonal cycle. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00320/43092/42629.pdf |
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