Bacteria:
biomass production
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The
bacterial biomass production rate ranges between 1 and 45
µg of carbon per litre per day, depending on the
trophic conditions prevailing on each atoll. This
amounts to 30% of the total mean primary plankton output,
and is therefore far from being negligible.
Figure :
Bacterial
production rates in various
Tuamotu atoll lagoons |
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Low
bacterial growth rates of only 0.07 to 1.5 day-1 were
recorded, which means that the mean doubling time ranges between 15 hours and 2 weeks,
depending on the atoll in question. The
bacterial assemblages present particularly low activity for waters with a mean temperature of 28°C.
However they are more active than those of the surrounding oceanic
surface waters, where the mean doubling time is one month.
This
characteristic, along with the low proportion of active cells
(<10%) and the very low growth rates estimated from the
decrease in the dissolved organic carbon (5-20%), suggests that these organisms
are strongly controlled by their
nutritional resources.
This
page was
based on :
Torréton
JP, Dufour P (1996a) Bacterioplankton production determined by DNA
synthesis, protein synthesis and frequency of dividing cells in
Tuamotu atoll lagoons and surrounding ocean. Microbial
Ecology 32: 185-202
Torréton
JP, Dufour P (1996b) Temporal and spatial stability of
bacterioplankton biomass and productivity in an atoll lagoon. Aquatic
Microbial Ecology 11:251-261
Torréton
J-P, Pagès J, Talbot V (soumis.) Bacterioplankton
and phytoplankton biomass and production in Tuamotu atoll lagoons.
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