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Acta Limnologica Brasiliensia

versão impressa ISSN 0102-6712versão On-line ISSN 2179-975X

Resumo

SILVA, Weliton José da et al. Expansion of invasive Ceratium furcoides (Dinophyta) toward north-central Brazil: new records in tropical environments. Acta Limnol. Bras. [online]. 2018, vol.30, e210.  Epub 14-Nov-2018. ISSN 0102-6712.  http://dx.doi.org/10.1590/s2179-975x5917.

Abstract: Aim

We record new occurrences of the invasive species Ceratium furcoides in reservoirs and their affluents in the Paraná River basin, State of Goiás (GO), central-western Brazil, and in some localities in the São Francisco River basin, northeastern region.

Methods

Qualitative and quantitative phytoplankton samples were collected from Corumbá Reservoir and Cascatinha Falls, Caldas Novas, GO, and João Leite Reservoir, Goiânia, GO, both in the Paraná River basin, and samples from the São Franscisco River basin. Specimens of C. furcoides were observed with optical, epifluorescence and scanning electron microscopy.

Results

The individuals of C. furcoides from these environments agreed morphologically with populations in other reservoirs in Brazil and other locations, especially concerning the tabulation and the shape of the fourth apical plate. These environments ranged from oligotrophic to eutrophic conditions. Physical and chemical variables of these waterbodies, compared to other environments where this species was found, demonstrate that C. furcoides is a highly eurytopic species. The dispersal pattern of C. furcoides seems to be more complex than upstream-downstream regulation, since the species occurs in high-altitude environments and systems upstream from previously recorded locations.

Conclusion

An analysis based on the areas of occurrence and the chronology of the records demonstrated that C. furcoides has spread toward northern Brazil. Studies of the relationships among populations recorded in other parts of Brazil and South America are required in order to develop accurate models of dispersal for this invasive species, and will facilitate the development of management policies for aquatic systems in Brazil.

Palavras-chave : invasive species; São Francisco River basin; Corumbá Reservoir; João Leite Reservoir; central-western Brazil; dinoflagellate.

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