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Bacteriophage diversity in the North Sea
A Wichels1, S S Biel, H R Gelderblom
1Biologische Anstalt Helgoland, D-27498 Helgoland, Germany. AWichels@AWI-Bremerhaven.de
Applied and Environmental Microbiology
|October 31, 1998
Summary
Marine bacteriophages are abundant but their ecological roles remain unclear. This study characterized 22 phage-host systems, revealing 13 distinct species and identifying host bacteria as Pseudoalteromonas, contributing to understanding aquatic phage diversity.
Area of Science:
- Marine microbiology
- Virology
- Aquatic ecology
Background:
- Increasing interest in bacteriophages in aquatic environments.
- High numbers of marine phage particles observed (10^4–10^7 particles/ml).
- Ecological roles, including bacterioplankton control and gene transfer, are largely unknown and debated.
Purpose of the Study:
- Investigate the diversity of marine bacteriophages and their host systems.
- Determine genetic relationships among collected phages.
- Identify and characterize the host bacteria associated with these phages.
Main Methods:
- Collection of 85 phages from the North Sea near Helgoland.
- Phage characterization using electron microscopy, DNA-DNA hybridization, and host range studies.
- Host bacteria identification via morphological, physiological tests, and 16S ribosomal DNA sequencing.
Main Results:
- Phages were classified into Myoviridae (11), Siphoviridae (7), and Podoviridae (4) families based on morphology.
- DNA-DNA hybridization confirmed no homology between different phage families.
- The 22 marine bacteriophages represented 13 distinct species.
- Host bacteria were identified as gram-negative, facultatively anaerobic, motile cocci belonging to the Pseudoalteromonas genus (gamma-Proteobacteria).
Conclusions:
- Significant diversity exists within marine bacteriophage populations.
- Established 13 distinct bacteriophage species and their Pseudoalteromonas hosts.
- Provides foundational data for understanding marine phage ecology and phage-host interactions.