The effect of saxitoxin and non-saxitoxin extracts of Cylindrospermopsis raciborskii (Cyanobacteria) on cyanobacteria and green microalgae

Autor(es)

Bittencourt-Oliveira, Maria do Carmo ^[1] ; Chia, Mathias Ahii ^[1] ; Camargo-Santos, Danilo ^{[1, 2]} ; Dias, Carlos T. S. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Biol Sci, Luiz de Queiroz Coll Agr, BR-13418900 Piracicaba, SP - Brazil

^[2] Sao Paulo State Univ, Inst Biol Sci, BR-13506900 Rio Claro, SP - Brazil

^[3] Univ Sao Paulo, Dept Exact Sci, Luiz de Queiroz Coll Agr, BR-13418900 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF APPLIED PHYCOLOGY; v. 28, n. 1, p. 241-250, FEB 2016.
• Citações Web of Science: 4

Resumo

The effect of saxitoxins (STX) on phytoplankton species is poorly understood. To date, no correlation between STX concentrations and phytoplankton physiology has been reported. We investigated the effect of STX (STX+, 0.5-10 mu g L (-1) total STX) and non-STX (STX-, 0.5-10 mu g L (-1) total STX biomass equivalent) extracts of Cylindrospermopsis raciborskii on Microcystis wesenbergii BCCUSP11, Microcystis aeruginosa BCCUSP232 (microcystin producing), Scenedesmus acuminatus UFSCar036, and Monoraphidium convolutum CMEA/UFF0201 under controlled laboratory conditions. Both STX+ and STX- extracts inhibited the cell density and specific growth rate of M. wesenbergii, M. aeruginosa, and S. acuminatus. However, the effect of STX+ extract on the phytoplankton strains was significantly higher than that of STX- extract. M. convolutum, on the other hand, was tolerant as both STX+ and STX- extracts did not significantly reduce its cell density and specific growth rate (day(-1)). The exposure of M. aeruginosa to STX+ and STX- resulted in higher total (intracellular and extracellular) microcystin concentration than the control. STX concentrations had a significant negative correlation with cell density and growth response of the phytoplankton strains investigated in this study. Conclusions can be made that although both STX+ and STX- extracts of C. raciborskii inhibited the growth of some phytoplankton species, the STX+ extracts were more toxic. (AU)

• Processo FAPESP: 13/11306-3 - Efeitos de anatoxina-a e cilindrospermopsina em diferentes concentrações de nitrogênio e irradiância na fisiologia de Microcystis aeruginosa (Cyanobacteria)e Scenedesmus acuminatus (Chlorophyta)
• Beneficiário: Mathias Ahii Chia
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 11/02957-5 - Ação alelopática de saxitoxinas e microcistinas em cianobactérias e microalgas verdes em condições controladas
• Beneficiário: Danilo Camargo Santos
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 11/50840-0 - Microcistinas e saxitoxinas sobre o crescimento de microalgas verdes e cianobactérias em condições controladas
• Beneficiário: Maria Do Carmo Bittencourt de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular