Spatio-temporal variations in bloom of the red-tide dinoflagellate Karenia mikimotoi in Imari Bay, Japan, in 2014: Factors controlling horizontal and vertical distribution

Aoki, Kazuhiro; Kameda, Takahiko; Yamatogi, Toshifumi; Ishida, Noriko; Hirae, Sou; Kawaguchi, Masato; Syutou, Toshio

doi:10.1016/j.marpolbul.2017.07.019

Cited by 30 publications

(14 citation statements)

References 22 publications

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“…In the early stages of K. mikimotoi red tide initiation, thin-layer orientation has frequently been observed in subsurface layers with high cell densities (Aoki et al 2017), and the physical disturbance of this thin layer has been proposed to be effective to prevent the development of red tides (Miyamura 2017). In the case of H. circularisquama red tides, treating frozen bottom sediments collected from red tide areas with algicidal viruses was demonstrated to be an effective preventive measure (Nakayama et al 2020).…”

Section: Environmentally Friendly Strategies Against Habsmentioning

confidence: 99%

“…With regards to red tide species that are susceptible to viruses, spraying of marine bottom sediments containing effective viruses has been reported to control harmful species populations, such as the bivalvekilling dinoflagellate H. circularisquama, through infection (Nakayama et al 2020). In the early stages of dinoflagellate K. mikimotoi-induced red tides, a thin layer with high cell density is usually formed at the mid-depths of specific water areas (Uchida et al 1998;Yamaguchi 1994;Miyamura 2016;Aoki et al 2017). The initial destructive methods applied to this thin layer, such as clay spraying (Murata 2017), the movement of thin-layer populations to the surface (i.e., unsuitable depths for their growth and survival; Miyamura 2017), and the application of bottom sediment perturbation using dragnets (Imai et al 2017a) with air bubbling when possible, are effective for suppressing K. mikimotoi populations.…”

Section: Theories and Criteria For Hab Controlling Strategiesmentioning

confidence: 99%

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Harmful algal blooms and environmentally friendly control strategies in Japan

2021

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The presence and status of harmful algal blooms (HABs) in Japan are reviewed, revealing a decrease in red tides; however, toxic blooms are found to be increasing in western Japan. Environmentally friendly control strategies against HABs are also compared with integrated agricultural pest management. Very high densities (105–108 CFU/g) of algicidal and growth-inhibiting bacteria were found in biofilm on seagrass and seaweed surfaces and in surrounding coastal seawater. The situation in freshwater ecosystems is similar to coastal seas for toxic cyanobacterium, Microcystis aeruginosa, and aquatic plants. These findings offer new insights into the ecology of influential bacteria and harmful algae, suggesting that protection and restoration of native seagrasses and seaweeds in coastal marine environments should be implemented to suppress HABs. Diatom blooms were successfully induced with bottom sediment perturbation to prevent the occurrence of harmful flagellates such as Chattonella spp. and Alexandrium catenella in the Seto Inland Sea; however, this method requires robust and reproducible verification. “Sato-Umi” is a helpful concept for HAB control in the sea and freshwater ecosystems when adequately managed by people (e.g., appropriate bottom perturbation; protection and restoration of seaweeds, seagrasses, and aquatic plants; application of polycultures of fish, seaweeds, etc.).

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Section: Environmentally Friendly Strategies Against Habsmentioning

confidence: 99%

Section: Theories and Criteria For Hab Controlling Strategiesmentioning

confidence: 99%

Harmful algal blooms and environmentally friendly control strategies in Japan

2021

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“…The occurrence frequency of K. mikimotoi blooms in Japan in 2012–2018 was approximately four times that in 1999–2011 [ 7 ]. Blooms of K. mikimotoi caused cultured fish mortality with approximate economic losses of 15.3 million US dollars in the Bungo Channel in 2012 [ 11 ]. An extensive K. mikimotoi bloom caused mass mortality of aquaculture fishes, leading to severe loss in Imari Bay in 2017 [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…An extensive K. mikimotoi bloom caused mass mortality of aquaculture fishes, leading to severe loss in Imari Bay in 2017 [ 7 ]. Consequently, numerous investigations have been carried out to study the physiology [ 12 , 13 , 14 , 15 ] and toxicology [ 4 , 5 , 6 , 16 , 17 ] of K. mikimotoi and to analyze the occurrence mechanism of K. mikimotoi blooms [ 7 , 11 , 18 , 19 ]. However, K. mikimotoi blooms are highly variable in location, timing, duration, and magnitude and do not occur every year, and the ecological processes involved in K. mikimotoi bloom formation remain largely obscure.…”

Section: Introductionmentioning

confidence: 99%

Bioavailability of Organic Phosphorus Compounds to the Harmful Dinoflagellate Karenia mikimotoi

et al. 2021

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Karenia mikimotoi is one of the most well-known harmful bloom species in temperate coastal waters. The present study investigated the characteristics of alkaline phosphatase (APase) and phosphodiesterase (PDEase) activities in hydrolysis of two phosphomonoesters (adenosine triphosphate (ATP) and ribulose 5-phosphate (R5P)) and a phosphodiester (cyclic adenosine monophosphate (cAMP)) in K. mikimotoi and compared its growth and physiological responses to the different forms of phosphorus substrates. K. mikimotoi produced comparable quantities of APase and PDEase to hydrolyze the organic phosphorus substrates, although hydrolysis of the phosphomonoesters was much faster than that of the phosphodiester. The growth of K. mikimotoi on organic phosphorus substrates was comparable to or better than that on inorganic phosphate. The difference in particulate organic nutrients (carbon, nitrogen, and phosphorus) and hemolytic activity supported different rates of hydrolysis-assimilation of the various organic phosphorus substrates by K. mikimotoi. The hemolytic activities of K. mikimotoi in the presence of organic phosphorus substrates were several times those in the presence of inorganic phosphate during the exponential phase. This suggested the potential important role of organic phosphorus in K. mikimotoi blooms.

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“…Harmful algal blooms (HABs) are typically related to the discharge of nitrogen and phosphorus nutrients from industry and agriculture and cause considerable threats to fisheries and public health worldwide ( Zhang et al, 2014 ; Berdalet et al, 2016 ). Karenia mikimotoi is a dominant dinoflagellate species in large-scale red tides that causes the mortality of benthic and pelagic organisms by secreting toxic substances ( Mooney et al, 2010 ; Kurekin et al, 2014 ; O’Boyle et al, 2016 ; Aoki et al, 2017 ). Various approaches and techniques (including physical, chemical, and biological methods) have been developed to prevent and control HABs ( Lee et al, 2013 ).…”

Section: Introductionmentioning

confidence: 99%

Biochemical and Physiological Responses of Harmful Karenia mikimotoi to Algicidal Bacterium Paracoccus homiensis O-4

et al. 2021

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Harmful algal blooms caused by Karenia mikimotoi frequently occur worldwide and severely threaten the marine environment. In this study, the biochemical and physiological responses of K. mikimotoi to the algicidal bacterium Paracoccus homiensis O-4 were investigated, and the effects on the levels of reactive oxygen species (ROS), malondialdehyde content, multiple antioxidant systems and metabolites, photosynthetic pigments, and photosynthetic index were examined. The cell-free supernatant in strain O-4 significantly inhibited K. mikimotoi cell growth. The bacterium caused the K. mikimotoi cells to activate their antioxidant defenses to mitigate ROS, and this effect was accompanied by the upregulation of intracellular antioxidant enzymes and non-enzyme systems. However, the overproduction of ROS induced lipid peroxidation and oxidative damage within K. mikimotoi cells, ultimately leading to algal death. In addition, the photosynthetic efficiency of the algal cells was significantly inhibited by O-4 and was accompanied by a reduction in photosynthetic pigments. This study indicates that O-4 inhibits K. mikimotoi through excessive oxidative stress and impaired photosynthesis. This research into the biochemical and physiological responses of K. mikimotoi to algicidal bacteria provides insights into the prophylaxis and control of harmful algal blooms via interactions between harmful algae and algicidal bacteria.

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Spatio-temporal variations in bloom of the red-tide dinoflagellate Karenia mikimotoi in Imari Bay, Japan, in 2014: Factors controlling horizontal and vertical distribution

Cited by 30 publications

References 22 publications

Harmful algal blooms and environmentally friendly control strategies in Japan

Harmful algal blooms and environmentally friendly control strategies in Japan

Bioavailability of Organic Phosphorus Compounds to the Harmful Dinoflagellate Karenia mikimotoi

Biochemical and Physiological Responses of Harmful Karenia mikimotoi to Algicidal Bacterium Paracoccus homiensis O-4

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