Table 5.

Virus-mediated mortality based on direct viral production rate measurement

Geographical location (reference)MethodViral production (109 ml−1day−1)Conversion factorcBurst sizeHost mortality rate (% day−1)Viroplankton turnover time (days)Comments
Bering and Chukchi Seas (304)VPRa,b 0.5–4.22 × 1021virus (mol of TdRd)1 501.9–121.2–15FVIC method also used
Southern California Bight (306), nearshoreVPR12–2301.25 × 1020 virus (mol of Pie)−1 10–3000.97–400.57–3.9Nearshore stations
Southern California Bight (306), offshoreVPR0–2.81.25 × 1020 virus (mol of Pi)−1 10–3006–88.9–30Offshore stations
Santa Monica, Calif. (93)VPRb 24–466.17 × 1020virus (mol of TdR)−1 2029–670.46–0.6Loss of bacteria to grazing and lysis is similar; FVIC method also used
Lake Hoare, Taylor Valley, Antarctica (144)VPR496.17 × 1020virus (mol of TdR)−1 0.3
  • a Viral production rate (direct estimation of in situ virus production through incorporation of radiolabeled substrate).

  • b Study utilized two methods for estimation of virus-mediated mortality.

  • c Conversion factor to estimate the number of viruses produced per mole of radiolabeled substrate incorporated into the viroplankton fraction.

  • d [3H]thymidine-radiolabeled substrate.

  • e 32P-radiolabeled substrate.