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| 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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| Castilho,Maria Carolina de Almeida; Wisniewski,Célio; Santos-Wisniewski,Maria José dos. |
| Knowledge of the life cycle of zooplankton species can provide information for a better understanding of the role of each species in the community and basic data for secondary production investigations. In this study, some life-cycle traits were measured for Scapholeberis armata freyi Dumont & Pensaert, 1983 (Cladocera, Daphnidae), maintained under controlled conditions in laboratory cultures. Experiments were carried out in incubators at a temperature of 23.0 ºC, photoperiod of 12 hours light/dark, and food supply (algal suspension of the chlorophycean Pseudokirchneriela subcapitata at 10(5) cells.mL-1 and mixed suspension of yeast, and fish ration added per organism, at equal proportions) that were kept constant. Observations were made once or... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anomopoda; Zooplankton; Longevity; Fecundity; Growth. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000400005 |
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| Negreiros,Natalia Felix; Santos-Wisniewski,Maria José dos; Santos,Renata Martins dos; Rocha,Odete. |
| Seasonal fluctuations in the dynamics of the plankton rotifer populations in an oligo-mesotrophic branch of a tropical reservoir were analyzed with respect to the possible influence of environmental conditions (physical, chemical and biological), with emphasis on biological interactions. Samples were taken monthly from August 2006 to July 2007. The well-defined climatic seasons were reflected in variations of the physical and chemical properties of the water. The zooplankton community consisted mainly of Rotifera, Cladocera and Copepoda, with occasional representatives of Chaoborus brasiliensis (Diptera), Ostracoda, Protozoa and Turbellaria. Rotifera was the dominant group in zooplankton community in 5 of the 12 months of the study and were represented by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rotifera; Furnas reservoir; Intra-zooplankton predation; Inter-specific competition. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000400023 |
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