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Trichodesmium
Trichodesmium
, also called
sea sawdust
, is a genus of
filamentous
cyanobacteria
. They are found in nutrient poor
tropical
and
subtropical
ocean waters (particularly around
Australia
and in the
Red Sea
, where they were first described by
Captain Cook
).
Trichodesmium
is a
diazotroph
; that is, it
fixes atmospheric nitrogen
into
ammonium
, a nutrient used by other organisms.
Trichodesmium
is the only known
diazotroph
able to
fix nitrogen
in daylight under aerobic conditions without the use of
heterocysts
.
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