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Sökning: swepub > Umeå universitet > Tidskriftsartikel > (1990-1994) > Wikner Johan 1961 > Linnéuniversitetet

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  • Wikner, Johan, 1961-, et al. (författare)
  • Periodic bacterivore activity balances bacterial-growth in the marine-environment
  • 1990
  • Ingår i: Limnology and Oceanography. - American Society of Limnology and Oceanography. - 0024-3590. ; 35:2, s. 313-324
  • Tidskriftsartikel (refereegranskat)abstract
    • The grazing rate of pelagic bacteria was repeatedly determined during 36-h time-course experiments with the minicell recapture technique. Die1 variation in the rate of grazing occurred in all water masses investigated. Maximal rates reached 2 x lo5 cells ml-’ h-r, whereas minimal values were 20 times lower. Highest grazing rates were found during the day in most cases, but grazing could also dominate at night as found in one study. Die1 periodicity was mainly due to variation in the per-cell feeding rate of bacterivorous flagellates. Accumulation of the bacterial biomass into the l-3-pm size fraction was positively correlated with changes in bacterial grazing. The transfer efficiency to organisms z 10 pm was low. On average, the daily grazing rate equaled 60% of the bacterial standing stock, exceeding bacterial growth by a factor of 2.6, as estimated from [3H]thymidine incorporation.
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