Stable Isotopes of Pteropod Shells as Recorders of Sub-Surface Water Conditions
199
"0
2
..!!!
28
26
5 24
~
6'
!!.,...
22
ICI)
CI)
20
28
27
26
25
24
23
22
21
20
18
•
G.mberl
y= O.72·X + 7.12
N =36
R 2 = 0.50
•
•
• •
•
•
•
•
/
/
.1:1
I. Linflata I
y = 0.59' X + 7.95
N = 55
R2 = 0.50
20
22
24
26
28
SST rC), measured
1988
I
I
G ruow---\ •
,
I
'---I I
: I
: I
, I
measured SST : I
:1
r -
;1
,\ "
,
\
: I
\
~I
,
_~:I
1
'\
1989
I
I
I
I
I
I
I
_____ 1
,
'I
r---, :1
I
,
l
i
, I
~
, l
I
, ~
,r ____ 1
,
,~----j
, "
_._.1
I
I
1990
19
L. inflata
18
1-Jan
1-Jul
1-Jan
1-Jul
1-Jan
1-Jul
Fig. 2. Measured vs 1)"0calculated SSTs. Both
lines show a shallower
slope than the 1: 1 line.
Water temperatures deduced from juvenile L.
inflata (precipitation
depth around 50 m) are
generally lower than the
measured SSTs; G. ruber
(about 30 m depth) provides mostly higher temperatures.
1-Jan
1991
j--'
1
1
CI
1
__ I
1-Jul
1-Jan
Fig. 3. Seasonal temperature variation off Cape Blanc (see Fig. lc). Lowest seasonal variability was observed in
1991.