Section 16
Chapter 15,707

Enhancement of viral production by addition of nitrogen or nitrogen plus carbon in subtropical surface waters of the South Pacific

Motegi, C.; Nagata, T.

Aquatic Microbial Ecology 48(1): 27-34


ISSN/ISBN: 0948-3055
Accession: 015706202

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We tested the hypothesis that viral production is limited by nutrient availability in oligotrophic subtropical surface waters of the South Pacific. Nutrient (C, N, P) addition experiments were conducted at 2 stations (Stn SX18, 39 degrees 60'S, 169 degrees 60'W; Stn SX22, 19 degrees 60'S, 169 degrees 60'W) to examine the responses of viral production (3 H-thymidine incorporation) and related variables in bottle-contained surface waters. At Stu SX18, viral production was enhanced in bottles amended with N and C with concomitant increases in bacterial production and growth, suggesting that both viral and bacterial production were co-limited by N and C. At Stu SX22, additions of N accelerated viral production with no consistent response of bacterial production, which might be an indication that prophage production was induced due to the alleviation in N limitation of host bacteria. In both experiments, nutrient-induced increases in viral production were not accompanied by increases in viral abundance, suggesting a possibility that viral production was balanced by loss. Our results suggest that viral production is limited by the availability of N or N+C in subtropical waters of the South Pacific, implying that viruses affect the mode of nutrient-induced changes in bacterial production and rnicrobial trophic transfers in oligotrophic oceanic waters.

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