Harmful algae and toxis in paranaguá bay , Brazil: bases for monitoring

Mafra, Luiz L.; Fernandes, Luciano F.; Proença, Luís Antônio de Oliveira

doi:10.1590/s1679-87592006000200002

Cited by 38 publications

(20 citation statements)

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“…As such, blooms of Pseudo-nitzschia spp. are common after large nutrient inputs, even if these blooms occur occasionally during local oscillations in salinity (MAFRA Jr. et al, 2006;LIEFER et al, 2009;PIEDRAS;ODEBRECHT, 2012).…”

Section: Resultsmentioning

confidence: 99%

“…These densities are not sufficient to be characterized as blooms, but are already considered dangerous because of the potential risk for shellfish contamination (MAFRA Jr. et al, 2006). Such cell ensities an in i ate an "alert" sit ation in monitoring programs during which the frequency and number of samples collected for cell counts should be intensified (CIDASC, 2012).…”

Section: Resultsmentioning

confidence: 99%

“…Such cell ensities an in i ate an "alert" sit ation in monitoring programs during which the frequency and number of samples collected for cell counts should be intensified (CIDASC, 2012). When cell abundance reaches 10 x 104 cells L -1 , toxin analysis in bivalve mollusks is also recommended because at such a level, DA concentrations in mollusk tissues can already be sufficient to poison humans, if the cells are producing and retaining reasonable amounts of toxins (MAFRA Jr. et al, 2006;PROENÇA et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

“…The dependence of traditional communities on fishery products as well as an increase in the consumption of bivalve mollusks from this bay raises a concern about human poisoning due to the consumption of products contaminated with algal toxins (PERL et al, 1990;CARVALHO et al, 1998;DARANAS et al, 2001;REIZOPOULOU et al, 2008;ETHERIDGE, 2010). The fear that such events could occur in Guaratuba Bay is reinforced by the presence of toxin-producing microalgae in nearby locations, including that of species that cause diarrhetic shellfish poisoning (DSP) and amnesic shellfish poisoning (ASP) (MAFRA Jr. et al, 2006;ODEBRECHT et al, 2002;PROCOPIAK et al, 2006;PROENÇA, 2006;BRANDINI, 2010;FERNANDES et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…and Pseudo-nitzschia species have already been recorded in abundances considered dangerous by monitoring programs (ODEBRECHT et al, 2002;MAFRA Jr. et al, 2006;PROENÇA et al, 2011;CIDASC, 2012). This bay is surrounded by seaside resorts and small-to medium-sized cities that can become densely populated in summer.…”

Section: Introductionmentioning

confidence: 99%

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SEASONAL AND SPATIAL PATTERNS OF TOXIGENIC SPECIES OF Dinophysis AND Pseudo-nitzschia IN A SUBTROPICAL BRAZILIAN ESTUARY

2015

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in Guaratuba Bay, Paraná state, Brazil, where aquaculture has been intensified in recent years. The highest abundances of Pseudo-nitzschia calliantha and P. pungens (up to 7.3 x 104 cells L -1 ), diatoms which cause amnesic shellfish poisoning (ASP), were correlated with higher values of temperature (from December to April, salinity (>20) and silicate concentrations (ranging from 6.0 to 90.0 µm). The occurrence of these harmful diatoms in the bay also appeared to depend upon the development of seeding mechanisms in the adjacent coastal water and its subsequent advection by tidal currents to the interior of the estuary. During the study period, Pseudo-nitzschia cell abundance remained low to moderate probably as a result of growth limitation by phosphate shortage, especially in the outer area of the estuary. In addition, harmful species of Dinophysis, dinoflagellates responsible for diarrhetic shellfish poisoning (DSP) events, were recorded in every sampling campaign. The highest abundances of D. acuminata, D. caudata and D. tripos were associated with the upper halocline layer in regions of the bay where water column stratification was more frequent. On some occasions, cell abundances of D. acuminata (up to 3.2 x 10³ cells L -1 ) exceeded levels considered harmful in areas used to cultivate bivalve mollusks for human consumption. These novel results strongly indicate the necessity of implementing a monitoring program for harmful microalgae in Guaratuba Bay. R E S U M OEste estudo investigou a distribuição espacial e temporal de espécies toxigênicas de fitoplâncton entre outubro de 2010 e abril de 2012 na Baía de Guaratuba, Estado do Paraná, Brasil, onde as atividades de maricultura têm se intensificado nos últimos anos. As maiores abundâncias de Pseudo-nitzschia calliantha e P. pungens (até 7,3 x 104 células L -1 ), diatomáceas causadoras do envenenamento amnésico por consumo de molusco (ASP), foram correlacionadas com valores mais elevados de temperatura (de dezembro a abril), salinidade (>20) e concentrações de silicato (variando de 6,0 a 90,0 µM). A ocorrência destas diatomáceas na baía aparentemente depende do desenvolvimento de mecanismo de inoculação na água costeira adjacente e de seu subsequente transporte pelas correntes de maré para o interior do estuário. Durante o período de estudo, no entanto, a abundância celular de Pseudo-nitzschia permaneceu baixa, provavelmente devido à limitação do crescimento por falta de fosfato, especialmente na área externa. Além disso, espécies nocivas de Dinophysis, um dinoflagelado responsável pela produção de toxinas diarreicas (DSP), foram registradas em todas as campanhas mensais de amostragem. As maiores abundâncias de D. acuminata, D. caudata e D. tripos foram associadas com a camada logo acima da haloclina, nas regiões da baía onde a estratificação da coluna de água foi mais frequente. Em algumas ocasiões, a abundância de células de D. acuminata (até 3,2 x 10³ células L -1 ) em áreas utilizadas para cultivo de moluscos bivalves para consumo humano, superou níveis c...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%