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- Title
Recurrent blooms of Heterosigma akashiwo (Raphidophyceae) in the Piraquê Channel, Rodrigo de Freitas Lagoon, southeast Brazil.
- Authors
Branco, S.; Menezes, M.; Alves-de-Souza, C.; Domingos, P.; Schramm, M. A.; Proença, L. A. O.
- Abstract
Six blooms of Heterosigma akashiwo (Raphidophyceae) were observed from March 2007 through March 2008 in the Rodrigo de Freitas Lagoon, a semi-conined eutrophic system located in Rio de Janeiro state, southeast Brazil. Vegetative cells of H. akashiwo analysed by optical and electron microscopy showed morphology as described in the literature. The blooms (2.8 x 104 to 4 x 108 cell.L-1) were restricted to the middle section of the Piraquê Channel, which is situated in the northeastern part of the lagoon and receives freshwater inlow. The salinity of subsurface water and the channel depth showed signiicant negative correlations with H. akashiwo abundances, and appeared to restrict the blooms to this compartment of the lagoon. No ish mortality was associated with the H. akashiwo blooms, nor were brevetoxins detected in a cell extract obtained from the bloom observed on 19 March 2007.
- Subjects
RODRIGO de Freitas Lagoon (Brazil); HETEROSIGMA; RAPHIDOPHYCEAE; ELECTRON microscopy; TAXONOMY; EUTROPHICATION
- Publication
Brazilian Journal of Biology, 2014, Vol 74, Issue 3, p529
- ISSN
1519-6984
- Publication type
Article
- DOI
10.1590/bjb.2014.0074