204
Fischer et al.
a
iii'
o
Il..
o
~
U
('l)
..I
.£9
Q)
"C
b
..I
"C
N
E
Cl
Ex
::::I
2.0
1.0
0.0
500
400
300
u::::
I
200
E
a
a
100
e>
o
U
1988
+
1-Jan
1-Jul
1-Jan
1-Jul
, , ,
++ •
"
,.
1-Jan
1-Jan
1989
~+ .+
•
1-Jul
1-Jul
1-Jan
1-Jan
1990
1991
1-Jul
1-Jan
1-Jul
1-Jan
1-Jul
1-Jan
1-Jul
1-Jan
Fig. 6a. Seasonal variation of /i"C of juvenile L. injlata (temperature-corrected; after Grossman and Ku 198~) in
comparison to G. ruber. The lower panel (b) shows the seasonal carbon fluxes normalized to 100 m (after MartJll et
al. 1987).
incorporated CO 2 during growth and not as seasonal changes of ambient water 8 1l C IC0 2
(Grossmanetal.I986). To test the assumption that
pteropod-8 ll C responds to changes in habitat-8 lJ C,
more field measurements of the dissolved pool in
combination with seasonal changes of pteropod8 1l C are needed. Furthermore, more studies on
pteropod ecology are necessary for a more reliable
application of their stable isotope records for
paleoceanographic purposes.
Acknowledgments
We gratefully acknowledge the help and assistance
of the masters and crews of RV Meteor and RV
Polarstern during trap deployments and recovery.
The manuscript benefitted from the helpful suggestions by Gerald Ganssen and Ahuva Almogi-Labin.
We are also indepted to B. Oelkers (Bremen).
This research was funded by the Deutsche
Forschungsgemeinschaft (Sonderforschungsbereich 261 at Bremen University, Contribution No.
182). Data are available under www.pangaea.de/
Projects/SFB26l.