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Registros recuperados: 8
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Bacteria and phytoplankton production rates in eight river stretches of the middle Rio Doce hidrographic basin (southeast Brazil) BABT
Petrucio,Mauricio Mello; Barbosa,Francisco Antônio R.; Thomaz,Sidinei Magela.
Measurements of bacterial secondary production (BSP), together with primary phytoplanktonic production (PPP) were conducted during dry and rainy seasons, in eight rivers of different orders submitted to different degrees of human impacts (different trophic degree). We aimed to determine and compare the importance of BSP and PPP in carbon fixation in these different lotic ecosystems. Our results showed that the Ipanema River was the most modified system by anthropogenic effluents inputs. These inputs altered the trophic degree and BSP rates of these streams and rivers.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacterioplankton; Carbon; Phytoplankton; Rivers; Trophic state.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000300019
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Bacterioplankton and phytoplankton production in seven lakes in the Middle Rio Doce basin, south-east Brazil. Repositório Alice
PETRUCIO, M. M.; BARBOSA, F. A. R.; FURTADO, A. L. dos S..
The purpose of this study was to measure the phytoplankton production (PP) and bacterial production (BP) simultaneously in seven lakes in the middle Rio Doce basin (southeast Brazil) during the dry and the rainy seasons. Limnological monitoring was conducted from 1999 to 2001 as well as both PP (radioactive carbon fixation) and BP (3H-Leucine incorporation) in four specific depths (100%, 10%, 1% of incident radiation, and aphotic zone). Furthermore, trophic state of the lakes was analyzed, considering the index proposed by Salas and Martino (1991) and Carlson (1977). In general, some parameters increased during the rainy season such as pH, conductivity, chlorophyll and total nitrogen. In the period of 1999/2000, the rain caused PP reduction in the lakes,...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Lakes; Trophic state; Phytoplankton; Bacterioplankton; Primary production; Bacterial secondary production.
Ano: 2006 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1009158
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Comparative study of the zooplankton composition of six lacustrine ecosystems in Central Brazil during the dry season BJB
STARLING,F. L. do R. M..
Zooplankton community from six lacustrine ecosystems located in Federal District (Central Brazil) was studied based on samples collected during the dry season (July to September). A total of 71 taxa were recorded: 44 rotifers, 17 cladocerans and 10 copepods. The highest number of zooplankton species was recorded in oligotrophic Bonita Pond (32 species) and the lowest number in hypertrophic waste stabilisation ponds (7 species). This tendency of decreasing the diversity with increasing trophic level was consistent with a cluster analysis of the samples based on Sorensen index of similarity. From the overall similarity dendrogram, two groups of ecosystems were distinguished: one containing the natural ponds Bonita and Formosa and the other comprising the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zooplankton taxonomy; Tropical zooplankton; Trophic state.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100013
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Distinct age and landscape influence on two reservoirs under the same climate IPB - Escola Superior Agrária
Geraldes, Ana Maria; Boavida, Maria José.
With the purpose of finding out whether different landscape occupation could affect water quality in two reservoirs of distinct age and subjected to the same climatic influence, several factors were investigated in a study lasting from January 2000 till December 2001. Total phosphorus, orthophosphate, chlorophyll a concentrations and water colour were determined monthly in winter and biweekly in summer, in two reservoirs located in the Portuguese part of River Douro catchment. Complementarily, variables such as nitrate, ammonium ion and ammonia gas, as well as water temperature, dissolved oxygen, conductivity, and transparency were measured. Trophic state of both reservoirs was assessed by computation of Carlson’s Trophic State Index. The potential...
Tipo: Article Palavras-chave: Trophic state; Nutrient sources; Land use; Reservoir age; Water quality; Socio-economic influence.
Ano: 2003 URL: http://hdl.handle.net/10198/712
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Efeitos da ocupação do solo, do uso da água e da idade das albufeiras nos parâmetros ambientais e na estrutura das comunidades zooplanctónicas IPB - Escola Superior Agrária
Geraldes, Ana Maria.
O presente trabalho decorreu em três albufeiras de idades distintas e sujeitas a diferentes tipos de perturbações de origem antropogénica. Estes sistemas aquáticos localizam-se na parte portuguesa da Bacia Hidrográfica do Rio Douro, na região de Trás-os-Montes. A albufeira da Serra Serrada foi criada em 1995 com o objectivo de abastecer de água a cidade de Bragança, actualmente com 34.750 habitantes. Como consequência do intenso consumo de água ocorrem flutuações de grande amplitude no seu nível. Por outro lado, na bacia de drenagem desta albufeira a pastorícia é particularmente intensa durante o Verão. Devido a esta actividade ocorrem nesta área, fogos frequentes que são induzidos pelos pastores com o objectivo de obterem melhores pastagens. A albufeira...
Tipo: Book Palavras-chave: Albufeiras; Estado trófico; Uso do solo; Idade das albufeiras; Qualidade da água; Flutuações no nível da água; Variáveis ambientais; Comunidades fito e zooplactónicas; Precipitação; Macrófitos; Actividade da fosfatase alcalina; Regeneração do ortofosfato; Nutrientes; Reservoirs; Trophic state; Nutrients; Land use; Reservoir age; Water quality; Water level fluctuation; Environmental variables; Phytoplankton and zooplankton assemblages; Precipitation; Macrophytes; Kaline phosphatase activity; Orthophosphate regeneration.
Ano: 2004 URL: http://hdl.handle.net/10198/770
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Observations and comments on the diatom Stephanodiscus minutulus (Kützing) Cleve & Möller (Bacillariophyceae) found for the first time in Chile from bottom sediments collected in Lake Laja Gayana Botánica
Cruces,Fabiola; Rivera,Patricio; Urrutia,Roberto.
This study reports the presence of the diatom Stephanodiscus minutulus (Kützing) Cleve & Möller for the frst time in Chilean continental waters; it is a taxon reported in many aquatic systems in Europe and North America and there are only scanty records from South America (Argentina). The species was found in a sedimentary profle collected from Lake Laja (Andes Mountains), Central Chile. The principal morphological features of S. minutulus are described, and comments about its relationship with other closely related taxa are given.
Tipo: Journal article Palavras-chave: Morphology; New record; Related taxa; Variability; Trophic state.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100002
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Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil) Anais da ABC (AABC)
OLIVEIRA,FÁBIO H.P.C. DE; ARA,ANDRÉ L.S. CAPELA E; MOREIRA,CESAR H.P.; LIRA,OSMAN O.; PADILHA,MARIA DO ROSÁRIO F.; SHINOHARA,NEIDE K.S..
This study investigated the water quality in an urban eutrophic reservoir in Northeastern Brazil, considering the influence of seasonality. Monthly, samples were collected in the sub-surface reservoir. The following abiotic variables were analyzed: temperature, pH, dissolved oxygen, apparent color, turbidity, conductivity, fluoride, total nitrogen, chlorides, total dissolved solids, total hardness, iron, copper, manganese, aluminum, chlorophyll-a and phaeophytin. Total and thermotolerant coliforms were analyzed according to APHA (2012). Cyanobacteria density was quantified through its biomass. The data were analyzed using one- way ANOVA and Pearson correlation test. Higher values mean phytoplankton biomass (26.3mm3.L–1) occurred in the dry season,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coliforms; Cyanobacteria; Reservoir; Trophic state.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401863
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Trophic state and microorganisms community of major sub-basins of the middle Rio Doce basin, southeast Brazil BABT
Petrucio,Mauricio Mello; Medeiros,Adriana Oliveira; Rosa,Carlos Augusto; Barbosa,Francisco Antônio Rodrigues.
Total phosphorus concentration was used to define the trophic state of the main sub-basins of the middle Rio Doce, in Minas Gerais State (southeast Brazil) and physical, chemical, and microbiological variables of water were analyzed during 2000 to 2001. The study evaluated changes in water quality caused by seasonality and human activities. Water temperature, conductivity, pH, total alkalinity, dissolved oxygen, and concentrations of NH4-N, NO2-N, NO3-N, total-N, PO4-P, total-P, DOC, and chlorophyll-a were measured in seven rivers stretches (sampling stations). Total yeasts, faecal and total coliforms, and heterotrophic bacteria were also determined. The studied areas were considered to be under oligotrophic to eutrophic conditions. The variables that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microorganisms; Phosphorus; Rivers; Trophic state.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000500015
Registros recuperados: 8
Primeira ... 1 ... Última
 

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