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Dynamics of bacterioplankton during a phytoplankton bloom in the high Arctic waters of the Franz-Joseph Land archipelagoMüller-Niklas G, Herndl GJ![]()
ABSTRACT: Bacterial abundance and activity were followed during a phytoplankton bloom in the high Arctic, the Franz-Joseph Land archipelago (80° to 82° N, 45° to 65° E), in July 1995. At the beginning of July the sea was entirely covered by ice; at the end of July
the ice coverage was about 50%. Water temperature varied between -1 and -0.6°C and salinity between 32 and 35o/oo. Phytoplankton cells exhibited photoinhibition even during incubation periods when maximum radiation was <400 µE m-2
s-1, indicating adaption to a low radiation level. Phytoplankton biomass, averaged over all 5 sampling sites, was 2.2 µg chl a l-1; primary production, at the 50% radiation level, was 27.3 µg C l-1 d-1
and mean bacterial abundance was 3.6
KEY WORDS: Arctic · Bacterioplankton · Phytoplankton · Carbon flux
Published in AME Vol.
11, No. 2
(1996) on August 29
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