Pathogens of Harmful Microalgae

Salomon, Paulo S.; Imai, Ichiro

doi:10.1007/978-3-540-32210-8_21

Cited by 26 publications

(32 citation statements)

References 42 publications

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“…For some harmful algal bloom-causing species, infective viruses have been isolated and confirmed in laboratory cultures (Brussaard 2004, Salomon & Imai 2006). In the case of red tides of Heterosigma akashiwo and Heterocapsa circularisquama, virus-induced mortality was demonstrated to be an important factor contributing to the rapid termination of red tides (Nagasaki et al 1994(Nagasaki et al , 2004.…”

Section: Red Tide Control By Virusesmentioning

confidence: 99%

“…During the last two decades, algicidal bacteria have been identified in marine coastal ecosystems and have received attention concerning the termination of noxious red tides (Imai et al 1993a, Doucette et al 1998, Sakata 2000, Yoshinaga 2002, Mayali & Azam 2004, Salomon & Imai 2006. Temporal fluctuations of algicidal bacteria against the red tide causing raphidophyte Heterosigma akashiwo were studied in northern Hiroshima Bay, the Seto Inland Sea, and the dynamics of H. akashiwo killers revealed a close relationship with that of H. akashiwo populations (Imai et al 1998a, Yoshinaga et al 1998).…”

Section: Red-tide Control By Algicidal Bacteriamentioning

confidence: 99%

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Eutrophication and occurrences of harmful algal blooms in the Seto Inland Sea, Japan

Imai

Yamaguchi

Hori

2006

Plankton Benthos Res

231

126

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Section: Red Tide Control By Virusesmentioning

confidence: 99%

Section: Red-tide Control By Algicidal Bacteriamentioning

confidence: 99%

Eutrophication and occurrences of harmful algal blooms in the Seto Inland Sea, Japan

Imai

Yamaguchi

Hori

2006

Plankton Benthos Res

231

126

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“…The Fisheries Agency of Japan supported these investigations during the 1990s for about 10 years, and rather many algicidal bacteria (AB) and growth-inhibiting bacteria (GIB) were actually isolated from Japanese coastal waters. Analyses of small subunit ribosomal DNA (SSU rDNA) revealed that common ABs and GIBs are usually Gram-negatives belonging to the alpha-and gamma-proteobacteria (mainly the genera Alteromonas , Pseudoalteromonas, Pseudomonas and Vibrio ) or the phylum Bacteroides (mainly the genera Cytophaga and Saprospira ) Salomon and Imai 2006 ;Imai 2011 ). Figure 25.1 shows an example of algicidal activities against three phytoplankton species by the bacterium Alteromonsa sp.…”

Section: Characteristics Of Algicidal Bacteriamentioning

confidence: 99%

Interactions Between Harmful Algae and Algicidal and Growth-Inhibiting Bacteria Associated with Seaweeds and Seagrasses

Imai

2015

Marine Protists

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Phytoplankton and bacteria are the main components of marine ecosystems and hence comprise abundant numbers and biomass in the sea. There exist close and diverse interactions between phytoplankton and bacteria in marine ecosystems. Among these relationships, bacteria possessing algicidal and growthinhibiting activities against phytoplankton have been increasingly gathering attention and are expected to control phytoplankton dynamics especially harmful algal blooms in coastal environments. Algicidal activities are divided into two types, i.e., the direct attack type, needing direct attachment to host algal cells, and the indirect attack type, producing algicidal matter. Some bacteria kill part of algal populations, and they are growth-inhibiting bacteria. In harmful algal blooms (HABs) of such as the raphidophytes Heterosigma akashiwo and Chattonella spp., bacteria play an important role in the bloom terminations. Most algicidal bacteria are particle-associated forms in coastal seas. A new fi nding is that huge numbers of algicidal bacteria against HAB species (dinofl agellates and raphidophytes) were attached to the surface of seaweeds such as the green alga Ulva pertusa, the red alga Gelidium spp. and the brown algae Sargassum muticum and S. thunbergii . The densities of these algicidal bacteria reached as many as 10 6 g −1 wet weight. Further, algicidal bacteria were found in the biofi lm of the seagrass Zostera marina with high densities of 10 7 g −1 wet blade or more. In the case of the toxic dinofl agellate Alexandrium tamarense , growth-inhibiting bacteria with strong activities were isolated from the blade of Z. marina . In developed countries, seagrass-and seaweed beds have been lost by reclamation for increasing land of commercial uses. We here propose restoration of seagrass-and seaweed beds, not only for increasing the nursery grounds of various marine lives but also for creating preventative strategies for HAB occurrences. This is a kind of activity in conformity with the Sato-Umi concept recently proposed.

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“…Several investigations have revealed that certain bacteria kill red tide organisms, thereby playing an important role in the decline of red tides (Imai et al 1993, Doucette et al 1998, Salomon and Imai 2006. Thus, the killing of red tide organisms by algicidal bacteria has been extensively studied (Fukami et al 1992, Mayali andDoucette 2002).…”

Section: Introductionmentioning

confidence: 99%

Interactions between marine bacteria and red tide organisms in Korean waters

Seong¹,

Jeong²

2013

ALGAE

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There is increasing interest in the relationships between marine bacteria and red tide organisms. Some bacteria are known to kill red tide organisms, and may be responsible for accelerating the termination of red tides. Thus, certain algicidal bacteria have been proposed for the control of red tides. Meanwhile, many red tide organisms are known to feed on marine bacteria. The roles of marine bacteria and red tide organisms are therefore reversible. In Korean waters, the killing of red tide organisms by algicidal bacteria, and also the feeding of red tide organisms on marine bacteria have been extensively investigated. The findings of such studies may influence the conventional view of red tide dynamics, and also planktonic food webs. Here, we review the species and concentrations of algicidal bacteria that kill red tide organisms in Korean waters, as well as the ingestion rate and grazing impact of red tide organisms on marine bacteria. Furthermore, we offer an insight into the ecological roles of these 2 components in marine planktonic food webs.

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Pathogens of Harmful Microalgae

Cited by 26 publications

References 42 publications

Eutrophication and occurrences of harmful algal blooms in the Seto Inland Sea, Japan

Eutrophication and occurrences of harmful algal blooms in the Seto Inland Sea, Japan

Interactions Between Harmful Algae and Algicidal and Growth-Inhibiting Bacteria Associated with Seaweeds and Seagrasses

Interactions between marine bacteria and red tide organisms in Korean waters

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