Invasion of the dinoflagellate Ceratium furcoides (Levander) Langhans 1925 at tropical reservoir and its relation to environmental variables

Biota Neotropica

Lidiane Cristina Da Silva²  Isabela Carnielli Leone¹  Maria José Dos Santos-wisniewski¹  Alberto Carvalho Peret¹  Odete Rocha¹ 

[1] ,University of São Carlos Post-graduate Program in Ecology and Natural Resources Department of Ecology and Evolutionary BiologySão Carlos SP ,Brazil

关键词: invasive species;    algal blooms;    eutrophication;    reservoir ecology;    espécie invasora;    blooms algais;    eutrofização;    ecologia de reservatórios;   

DOI  :  10.1590/S1676-06032012000200010

来源: SciELO

【 摘 要 】

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 correlated with temperature, nutrients (nitrate and nitrite) and water electric conductivity. The highest density was recorded in June when temperature was low. The presence of Ceratium furcoides in the reservoir apparently has not yet affected the reservoir water quality or other plankton communities. However, if it becomes fully established it could perhaps become a problem in the reservoir or even to spread out to other reservoirs in Rio Grande basin.

【 授权许可】

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