Secondary Production of Owenia fusiformis
265
Oxygen concentration
Porto Garibaldi
Cesenatico
12
12
3m
St.4
8
8
~~
CIl
E
4
4
0
0
10
~
10
~
~
t;;
fo~
IE
l§l
~
r-m
!"
~
~
!"
m
-,
n
..!.
-..!.
=s
n
.!.
::..
c:
a.
"5
c:
~
::>
co
a.
c
~
::s
III
-.
0
III
..,
III
«
..., 0
III
...,
....,
«
..,
...,
-,
12
12
St.304
St.314
8m
a
8
~~
CD
E
4
4
2,78
a
0
10
10
IE
~
r-~
b;
CD
IE
IE
IE
b;
....
....
' %
!"
~
~
!"
m
.!.
::..
n
::..
".!.
:s 13
-,
..!.
::..
c
c:
c:
1\1
a.
:::l
.. a. ::::I III ~
III
~
:::l
«
...,
0
«
...,
....,
0
...,
12
...,
...,
12
...,
...,
SL1004
SL1014
12-14 m
8
8
't..
CD
E
4
4
2,53
0
0
~
IE
IE
l§l
....
"IE
~
~ ~
fo....
t;;
m
!"
m
!"
!"
t
!
::..
~
-,
..!.
::..
-,
.!.
t
.!.
...!.
:::l
"
c:
~
::>
c:
a.
::>
Q.
=>
01
..., 0
III
..,
01
«
..., 0
1\1
«
...,
...,
.....
-,
....,
Fig. 2. Average values of oxygen concentration in the water layer close to the bottom in the six stations
Table 2. Sediment textures, according to the Wentworth nomenclature, in the six stations for each sampling date
July 1996
October 1996
February 1997
May 1997
July 1997
Porto Garibaldi
Station 4 (3 m)
Very fine sand
Very fine sand
Very fine sand
Very fine sand
Very fine sand
Station 304 (8 m)
Sandy silt
Silt
Silty sand
Sandy silt
Sandy silt
Station 1004 (14 m)
Silt
Silt
Silt
Silt
Silt
Cesenatico
Station 14 (3 m)
Very fine sand
Very fme sand
Very fine sand
Very fine sand
Very fine sand
Station 314 (8 m)
Silt
Sandy silt
Sandy silt
Silt
Silty sand
Station 1014 (12 m)
Silt
Silt
Silt
Silt
Silt