期刊
FEMS MICROBIOLOGY ECOLOGY
卷 84, 期 2, 页码 223-234出版社
WILEY-BLACKWELL
DOI: 10.1111/1574-6941.12060
关键词
marine; Synechococcus; Prochlorococcus; cyanophage; viruses
类别
资金
- New Zealand Ministry of Science and Innovation through the Coasts and Oceans OBI
- National Science Foundation [OCE0851113, OCE0825405, OCE1030518]
- Directorate For Geosciences
- Division Of Ocean Sciences [1030518] Funding Source: National Science Foundation
- Division Of Ocean Sciences
- Directorate For Geosciences [0851113] Funding Source: National Science Foundation
The distribution of cyanomyoviruses was estimated using a quantitative PCR (qPCR) approach that targeted the g20 gene as a proxy for phage. Samples were collected spatially during a >3000km transect through the Sargasso Sea and temporally during a gyre-constrained phytoplankton bloom within the southern Pacific Ocean. Cyanomyovirus abundances were lower in the Sargasso Sea than in the southern Pacific Ocean, ranging from 2.75x103 to 5.15x104mL1 and correlating with the abundance of their potential hosts (Prochlorococcus and Synechococcus). Cyanomyovirus abundance in the southern Pacific Ocean (east of New Zealand) followed Synechococcus host populations in the system: this included a decrease in g20 gene copies (from 4.3x105 to 9.6x103mL1) following the demise of a Synechococcus bloom. When compared with direct counts of viruses, observations suggest that the cyanomyoviruses comprised 0.5 to >25% of the total virus community. We estimated daily lysis rates of 0.246% of the standing stock of Synechococcus in the Pacific Ocean compared with c. <1.0% in the Sargasso Sea. In total, our observations confirm this family of viruses is abundant in marine systems and that they are an important source of cyanobacterial mortality.
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