Journal ArticleDOI
High abundance of viruses found in aquatic environments.
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Using a new method for quantitative enumeration, up to 2.5 x IO8 virus particles per millilitre in natural waters indicate that virus infection may be an important factor in the ecological control of planktonic micro-organisms.Abstract:
The concentration of bacteriophages in natural unpolluted waters is in general believed to be low, and they have therefore been considered ecologically unimportant. Using a new method for quantitative enumeration, we have found up to 2.5 x 10(8) virus particles per millilitre in natural waters. These concentrations indicate that virus infection may be an important factor in the ecological control of planktonic micro-organisms, and that viruses might mediate genetic exchange among bacteria in natural aquatic environments.read more
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Journal ArticleDOI
Marine phage genomics.
TL;DR: The handful of marine phage genomes that have been sequenced, along with prophages in marine bacterial genomes, and partial sequencing of uncultivated phages are yielding glimpses of the tremendous diversity and physiological potential of the marine phages community.
Book ChapterDOI
Bacterial Influence on the Variability in the Ocean’s Biogeochemical State: A Mechanistic View
Farooq Azam,David C. Smith +1 more
TL;DR: In this paper, Azam et al. showed that the pathway DOM is a major route for the flows of material and energy in pelagic marine ecosystems and that viruses may also play important ecological roles.
Journal ArticleDOI
Grazing on bacteria by flagellates and cladocerans in lakes of contrasting food-web structure
Dolors Vaqué,Michael L. Pace +1 more
TL;DR: Cladoceran grazing on bacteria was important in both lakes contrary to the initial expectation and emphasize the significance of cladocerans and attached tlagellates as consumers of bactena in freshwater ecosvstems.
Journal ArticleDOI
Ecological dynamics of the toxic bloom-forming cyanobacterium Microcystis aeruginosa and its cyanophages in freshwater.
Mitsuhiro Yoshida,Takashi Yoshida,Aki Kashima,Yukari Takashima,Naohiko Hosoda,Keizo Nagasaki,Shingo Hiroishi +6 more
TL;DR: The abundance of potentially Microcystis aeruginosa-infectious cyanophages in freshwater was studied using g91 real-time PCR and it was suggested that cyanophage dynamics may also affect shifts in microcystin-producing and non-microcystIn-producing populations.
Journal ArticleDOI
Characterization of culturability, protistan grazing, and death of enteric bacteria in aquatic ecosystems.
TL;DR: Results showed that RSB are a reliable indicator of the decay in both the total number and the CFU of enteric bacteria in natural water samples, and found that protistan grazing was found to be the main cause of the decrease in total numbers of enteringic bacteria.
References
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Journal ArticleDOI
Minimum bacterial density for bacteriophage replication: implications for significance of bacteriophages in natural ecosystems.
B A Wiggins,M Alexander +1 more
TL;DR: It is suggested that bacteriophages do not affect the number or activity of bacteria in environments where the density of the host species is below the host cell threshold of about 10(4) CFU/ml.
Journal ArticleDOI
Rate of bacterial mortality in aquatic environments
TL;DR: Results obtained from river water, estuarine water, and seawater show overall bacterial mortality rates in the range 0.010 to 0.030 h, in good agreement with the range of growth rates measured in the same environments.
Journal ArticleDOI
Do bacteria-sized marine eukaryotes consume significant bacterial production?
Jed A. Fuhrman,George B. McManus +1 more
TL;DR: Evidence is presented that previously uncharacterized, small eukaryotes that are able to pass even 0.6-micrometer filters may be responsible for a large fraction of the total grazing in coastal waters.