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Registros recuperados: 4
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Invasion of the dinoflagellate Ceratium furcoides (Levander) Langhans 1925 at tropical reservoir and its relation to environmental variables Biota Neotropica
Silva,Lidiane Cristina da; Leone,Isabela Carnielli; Santos-Wisniewski,Maria José dos; Peret,Alberto Carvalho; Rocha,Odete.
Dinoflagellates of the genus Ceratium are chiefly marine but there are rare occurrences in freshwater. In this study we analyze the invasion and progressive establishment of Ceratium furcoides, an exotic species, in the Furnas Reservoir. Samples were taken at 36 points in the reservoir, during the months of March, June, September and December, 2007. Measurements of some physical and chemical variables were simultaneously performed at each site. The occurrence of C. furcoides was registered at 20 sites, with densities varying between 0.57 and 28,564,913.0 ind.m-3. Blooms of this species were recorded in points which were classified as mesotrophic, coinciding with the places receiving high amounts of untreated domestic sewage. C. furcoides density was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Invasive species; Algal blooms; Eutrophication; Reservoir ecology.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000200010
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O estado atual do conhecimento da diversidade dos Cladocera (Crustacea, Branchiopoda) nas águas doces do estado de Minas Gerais Biota Neotropica
Santos-Wisniewski,Maria José dos; Matsumura-Tundisi,Takako; Negreiros,Natália Felix; Silva,Lidiane Cristina da; Santos,Renata Martins dos; Rocha,Odete.
O objetivo do presente trabalho é apresentar uma check list atualizada dos registros existentes para espécies de Cladocera nas águas doces do Estado de Minas Gerais que possa servir de base para os estudos em andamento ou estudos futuros dentro do escopo do Programa Biota Minas. O trabalho baseia-se numa extensa revisão da literatura incluindo recentes revisões taxonômicas, particularmente para alguns gêneros da família Chydoridae. O levantamento realizado evidenciou a ocorrência de 94 espécies de Cladocera, distribuídos em 88 corpos de água no estado de Minas Gerais. Estes cladóceros incluem representantes de 35 gêneros pertencentes a 7 das 8 famílias com ocorrência nas águas doces da região Neotropical. Para os Cladocera em geral, a família com maior...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biodiversidade; Riqueza de cladocera; Chydoridae; Cladóceros tropicais; Diversidade em água doce; Zooplâncton.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000300024
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Zooplankton communities as eutrophication bioindicators in tropical reservoirs Biota Neotropica
Gazonato Neto,Antonio José; Silva,Lidiane Cristina da; Saggio,Angelo Augusto; Rocha,Odete.
Eutrophication is a process characterized by an increase in the aquatic system productivity, which causes profound changes in the structure of its communities. Owing to the high environmental sensitivity of planktonic species, the study of their communities can indicate the deterioration of the environment. The Jaguari and Jacareí reservoirs are part of the Cantareira System, supplying water to São Paulo inhabitants and that has been affected by several forms of continuous human interference. Here we analyze some properties of the zooplankton community as bioindicators of eutrophication and water quality change. In situ physical and chemical measurements were carried out, water was collected for analysis and quantitative zooplankton samples were taken at...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zooplankton; ABC curves; Calanoida/Cyclopoida ratio; Cantareira System; Environmental impact.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032014000400104
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Phytochemical and molluscicidal activity of Mikania glomerata Sprengel (Asteraceae) in different lifestages of Subulina octona (Mollusca, Subulinidade) BABT
Souza,Bruna Aparecida de; Silva,Lidiane Cristina da; Chicarino,Evelyn Durço; Bessa,Elisabeth Cristina de Almeida.
The objective of this work was to study the molluscicidal activity of aqueous extract of Mikania glomerata on the land snail Subulina octona and to assess the changes caused on the snail's fecundity, growth, hatchability and the offspring produced after exposure. Eggs, newly hatched and 30 day old snails were exposed to the sublethal concentration of M. glomerata extract for 24 and 48 h and the observations were made for 120 days. The presence of tannins, flavonoids and saponins were shown by phytochemical tests. The extract reduced significantly the hatchability and the survival of the offspring hatched from the exposed eggs. The eggs exposed for 48 h presented lower hatchability rates. There was a reduction on survival and growth of newly hatched and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Land snail; Guaco; Molluscicidal; Toxicity; Control.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000200015
Registros recuperados: 4
Primeira ... 1 ... Última
 

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