Biomass and production of heterotrophic bacterioplankton in the oceanic subarctic Pacific

摘要: Abstract As part of the Subarctic Pacific Ecosystem Research (SUPER) program, we measured abundance and biomass production heterotrophic bacterioplankton in subarctic compared these parameters with those phytoplankton during four cruises 1987 1988. Bacterial was about equal to all cruises. Based on rates bacterial assuming a growth efficiency 50%, estimate that bacteria consumed 10% (June 1987) 24% (August 1988) primary euphotic zone. These percentages are low other aquatic ecosystems, apparently due ( −1 ) iin Pacific. In contrast, were much higher (0.1–8.8 day ). limited by supply dissolved organic matter temperature. Even rates, however, increased 2–5-fold May August 1988, changes not obviously related corresponding nor production. Heterotrophic constitutes large reservoir carbon nitrogen needs be considered modelling ecosystem dynamics