Avanço da invasão de sistemas aquáticos por Ceratium furcoides (Dinophyta) em direção ao centro-norte brasileiro: novos registros em ambiente tropicais
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2018
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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.
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Invasive species, São Francisco River basin, Corumbá Reservoir, João Leite Reservoir, Central-western Brazil, Dinoflagellate, Espécies invasoras, Bacia do rio São Francisco, Bacia do rio Corumbá, Centro-Oeste brasileiro, Dinoflagelado
Citação
SILVA, Weliton José da et al. Expansion of invasive Ceratium furcoides (Dinophyta) toward north-central Brazil: new records in tropical environments. Acta Limnologica Brasiliensia, Rio Claro, v. 30, e210, 2018. DOI: 10.1590/S2179-975X5917. Disponível em: https://www.scielo.br/j/alb/a/sgfnF4bRWYnWygDwMtNTqNt/#. Acesso em: 6 nov. 2024.