Fig. 4. Growth rates (p. day-I)
in batch cultures of natural
predator-free bacterial assemblage collected in February
and June 1997, in upper (ul)
and bottom layers (bl),
amended with phosphate (P),
ammonia plus nitrate (N) and
organic carbon as glucose (G)
3500
3000
.,:;-2500
!=
::E
~
2000
~
('II
. .
c.i
1500
.9
~
=
....
1000
C.I
:s
~
....,;j
500
0
2
o
--m
W
LL
February 1998
0
24
48
72
DOC Seasonality in N. Adriatic and Aggregate Formation
461
+G , P , N
:J
..c
....--- ---:J
CO
---W
W
W
Z
LL
::J
Z
--,
::J
--,
10000 ~---------------,
June 1998
8000
6000
4000
2000
a
96
a
24
48
72
96
incubation time (h)
Fig.5. Bacterial production rates, as leucine incorporation, in natural predator-free bacterial assemblage collected in 1998 in
the surface layer, amended with phosphate (P), ammonia plus nitrate (N) and organic carbon as glucose (G)