role of bacteria in the fluxes of matter
JP Torréton, IRD
involvement of bacteria in the fluxes of matter occurring in the
Tuamotu atoll lagoons is described in detail in the 6 pages which
can be accessed by clicking on the links in the following figure.
important introductory comments:
the spatial point of view,
the lagoons can be said to be quite homogeneous, both vertically
and horizontally speaking. This homogeneity has resulted from two
processes. First, the prevailing south-easterly trade winds, which
have a mean annual force of 5 m.s-1, suffice to
constantly mix the water column.
the possible inputs are restricted because both the coral ring and
the surrounding ocean waters are so poorly endowed with organic
and mineral components. In addition, these inputs are quite
diffusely distributed around the ring in the case of the
terrestrial inputs, and widely spread across the ring by the hoas
in the case of the oceanic inputs.
the temporal point of view,
it is worth noting the consistency of the bacterial processes,
whether they are observed on the scale of a single day, a month or
a whole season. This can be seen from the figure below :
and productivity of the bacteria during various
carried out on Tikehau. The primary
production data are reproduced from Charpy &
large symbols give the means and standard errors
for each campaign. The 2 campaigns carried out in
Nov. 91 and Nov. 92 have been given different
great homogeneity of the bacterial stocks and processes in time
and space was confirmed by all the data obtained in this study on
12 of the Tuamotu atolls.
JP, Dufour P (1996b) Temporal and spatial stability of
bacterioplankton biomass and productivity in an atoll lagoon. Aquatic
Microbial Ecology 11:251-261
J-P, Pagès J, Talbot V (soumis.) Bacterioplankton and
phytoplankton biomass and production in Tuamotu atoll lagoons.