Harmful Algae

Souza, Catharina Alves de; Mardones, Jorge I.; Yñiguez, Aletta T.; Bihan, Véronique Le; Guillotreau, Patrice; Gatti, Clémence; Richlen, Mindy L.; Larsen, Jacob; Berdalet, Elisa

doi:10.1007/978-981-19-5065-0_10

Cited by 1 publication

(1 citation statement)

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“…Some coastal regions of the world are experiencing an increase in harmful algal blooms (HABs), especially under the ongoing climate change scenario [ 1 ]. These HABs have exerted significant negative impacts on human and environmental health, tourism, economies and worldwide aquaculture production [ 2 , 3 ]. These deleterious impacts produced by HABs present an important challenge to the institutions responsible for the management of coastal resources, resulting in the implementations of a wide variety of mitigation strategies, among which the use of chemicals, such as hydrogen peroxide (H 2 O 2 ), stands out.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of Marine Dinoflagellates Using Hydrogen Peroxide (H2O2) Increases Toxicity towards Epithelial Gill Cells

et al. 2022

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Hydrogen peroxide (H2O2) has been shown to efficiently remove toxic microalgae from enclosed ballast waters and brackish lakes. In this study, in vitro experiments were conducted to assess the side effects of mitigating toxic and non-toxic dinoflagellates with H2O2. Five H2O2 concentrations (50 to 1000 ppm) were used to control the cell abundances of the toxic dinoflagellates Alexandrium catenella and Karenia selliformis and the non-toxic dinoflagellates Lepidodinium chlorophorum and Prorocentrum micans. Photosynthetic efficiency and staining dye measurements showed the high efficiency of H2O2 for mitigating all dinoflagellate species at only 50 ppm. In a bioassay carried out to test cytotoxicity using the cell line RTgill-W1, control experiments (only H2O2) showed cytotoxicity in a concentration- and time- (0 to 24 h) dependent manner. The toxic dinoflagellates, especially K. selliformis, showed basal cytotoxicity that increased with the application of hydrogen peroxide. Unexpectedly, the application of a low H2O2 concentration increased toxicity, even when mitigating non-toxic dinoflagellates. This study suggests that the fatty acid composition of toxic and non-toxic dinoflagellate species can yield toxic aldehyde cocktails after lipoperoxidation with H2O2 that can persist in water for days with different half-lives. Further studies are needed to understand the role of lipoperoxidation products as acute mediators of disease and death in aquatic environments.

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Section: Introductionmentioning

confidence: 99%