Superoxide production by marine microalgae

Marshall, Judith-Anne; Salas, Miguel de; Oda, Tatsuya; Hallegraeff, Gustaaf M.

doi:10.1007/s00227-005-1596-7

Cited by 136 publications

(69 citation statements)

References 21 publications

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“…Other mechanisms such as mechanical anoxia, hemolytic compounds, and reactive oxygen substances are also associated with the harmful effects of H. akashiwo (Kuroda et al, 2005;Marshall et al, 2005;Ling and Trick, 2010). Moreover, although the blooms may not act directly on the fish, they can be harmful to many organisms including copepods, ciliates, larvae and adults of oysters, shrimps, and scallops (Clough and Strom, 2005;Wang et al, 2006;Yu et al, 2010), affecting different trophic levels.…”

Section: Discussionmentioning

confidence: 99%

Recurrent blooms of Heterosigma akashiwo (Raphidophyceae) in the Piraquê Channel, Rodrigo de Freitas Lagoon, southeast Brazil

et al. 2014

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Six blooms of Heterosigma akashiwo (Raphidophyceae) were observed from March 2007 through March 2008 in the Rodrigo de Freitas Lagoon, a semi-confined 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 × 10 4 to 4 × 10 8 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 inflow. The salinity of subsurface water and the channel depth showed significant negative correlations with H. akashiwo abundances, and appeared to restrict the blooms to this compartment of the lagoon. No fish 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.Keywords: morphology, taxonomy, blooms, urban coastal lagoon, Rio de Janeiro. ) foram restritas à zona intermédia do canal Piraquê, que se situa na parte nordeste da lagoa e recebe aporte de água doce. A salinidade da sub-superfície da água e a profundidade do canal apresentaram correlação negativa significativa com a abundância de H. akashiwo e parecem determinar a formação de florações restritas a este compartimento da lagoa. Não houve mortalidade de peixes durante as florações de H. akashiwo e não foi detectada a presença de brevetoxinas em um extrato celular obtido a partir da floração observada em 19 de março de 2007. Florações recorrentes de

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Section: Discussionmentioning

confidence: 99%

Recurrent blooms of Heterosigma akashiwo (Raphidophyceae) in the Piraquê Channel, Rodrigo de Freitas Lagoon, southeast Brazil

et al. 2014

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“…On the other hand, H. akashiwo is an ROS producer (Oda et al, 1997;Twiner et al, 2001), and ROS produced by raphidophytes are known to affect the growth and survival of the marine bacterium Vibrio alginolyticus (Oda et al, 1997;Kim et al, 1999;Marshall et al, 2005). Therefore, we also examined the possible effects of ROS produced by H. akashiwo on the growth and interaction between P. minimum and H. akashiwo, and found that the H. akashiwo strain used in this study produced ROS, but the levels produced were lower than from C. antiqua (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, to clarify whether allelochemicals, reportedly produced by P. minimum and H. akashiwo, were involved in the growth and interactions of these species, we examined the effects of crude extracts from culture filtrates of both species on the growth of each other and on a third target species, S. costatum. H. akashiwo is also known to produce reactive oxygen species (ROS) (Oda et al, 1997;Twiner et al, 2001), and several studies have reported that ROS produced by raphidophytes affect growth and viability of the bacterium Vibrio alginolyticus (Miyamoto et al) Sakazaki deposited as Oceanomonas alginolytica Miyamoto et al (Oda et al, 1997;Kim et al, 1999;Marshall et al, 2005). Therefore, we also examined the effect of ROS produced by H. akashiwo on the growth and interactions of P. minimum and H. akashiwo by using a comparative approach with the raphidophyte Chattonella antiqua (Hada) Ono, which is also an ROS producer.…”

Section: Introductionmentioning

confidence: 99%

The role of interactions between Prorocentrum minimum and Heterosigma akashiwo in bloom formation

et al. 2010

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Keywords Allelopathy ・ Growth and interaction ・ Heterosigma akashiwo ・ Prorocentrum minimum・Reactive oxygen species・Skeletonema costatumThis manuscript has not been submitted elsewhere in identical or similar form, nor will it be during the first three months after its submission to Hydrobiologia. 3Abstract We examined the growth and interactions between the bloom-forming flagellates Prorocentrum minimum and Heterosigma akashiwo using bi-algal culture experiments. When both species were inoculated at high cell densities, growth of H. akashiwo was inhibited by P. minimum. In other combinations of inoculation densities, the species first reaching the stationary phase substantially suppressed maximum cell densities of the other species, but the growth inhibition effect of P. minimum was stronger than that of H. akashiwo. We used a mathematical model to simulate growth and interactions of P. minimum and H. akashiwo in bi-algal cultures.The model indicated that P. minimum always out-competed H. akashiwo over time.Additional experiments showed that crude extracts from P. minimum and H. akashiwo cultures did not affect the growth of either species, but both strongly inhibited the growth of the bloom-forming diatom Skeletonema costatum. Further experiments showed that it was unlikely that reactive oxygen species produced by H. akashiwo were responsible for the inhibition of P. minimum growth.4

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“…However, biological production of H 2 O 2 could also be significant. The ability to produce extracellular O { 2 is widespread in marine phytoplankton (Marshall et al 2005) and in bacteria (Diaz et al 2013). Direct production of extracellular H 2 O 2 (without O { 2 as a precursor) by marine diatoms has been observed in conjunction with the oxidation and subsequent utilization of organic nitrogen sources (Palenik et al 1987).…”

mentioning

confidence: 99%

Hydrogen peroxide dynamics in an agricultural headwater stream: Evidence for significant nonphotochemical production

Dixon

Vermilyea

Scott

et al. 2013

Limnology & Oceanography

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Hydrogen peroxide (H 2 O 2 ) plays key roles in aquatic systems, including metal redox cycling and degradation of organic matter into bioavailable forms. Abiotic photoproduction, via photo-oxidation of chromophoric dissolved organic matter, has generally been assumed to be the most important source of H 2 O 2 to freshwater systems in the daytime. However, the significance of other H 2 O 2 sources has not been previously examined in situ. In this study, isotopically labeled H 2 O 2 (H 2 18 O 2 ) was added to in-stream mesocosms exposed to light and dark periods. By measuring total H 2 O 2 and H 2 18 O 2 in tandem, we inferred absolute rates of H 2 O 2 production and decay, which occurred simultaneously. Abiotic photoproduction rates were measured independently by exposing filtered samples to sunlight. Even in these shallow systems, total production rates greatly exceeded rates of abiotic photoproduction, and other sources of H 2 O 2 , most likely biological production, were the dominant control on the H 2 O 2 budget. Thus, H 2 O 2 and its precursor superoxide (O { 2 ) may play a greater role in biogeochemical processes, especially in the absence of light, than previously thought.

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Superoxide production by marine microalgae

Cited by 136 publications

References 21 publications

Recurrent blooms of Heterosigma akashiwo (Raphidophyceae) in the Piraquê Channel, Rodrigo de Freitas Lagoon, southeast Brazil

Recurrent blooms of Heterosigma akashiwo (Raphidophyceae) in the Piraquê Channel, Rodrigo de Freitas Lagoon, southeast Brazil

The role of interactions between Prorocentrum minimum and Heterosigma akashiwo in bloom formation

Hydrogen peroxide dynamics in an agricultural headwater stream: Evidence for significant nonphotochemical production

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