 |
| Titel |
Interpretation of benthic foraminiferal stable isotopes in subtidal estuarine environments |
| VerfasserIn |
P. Diz, F. J. Jorissen, G. J. Reichart, C. Poulain, F. Dehairs, E. Leorri, Y.-M. Paulet |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 11 ; Nr. 6, no. 11 (2009-11-13), S.2549-2560 |
| Datensatznummer |
250004091
|
| Publikation (Nr.) |
 copernicus.org/bg-6-2549-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| Here we present a novel approach for the interpretation of stable isotope
signatures recorded in benthic foraminifera from subtidal estuarine
environments. The stable isotopic composition (δ18O and
δ13C) of living Ammonia tepida and Haynesina germanica
is examined at four stations in the Auray River
estuary (Gulf of Morbihan, France) sampled in two contrasting seasons,
spring 2006 and winter 2007. Comparing benthic foraminiferal
δ18O measurements with theoretical oxygen isotopic equilibrium values,
calculated on the basis of water temperature and salinity measurements in
the upper and lower estuary, i.e., T-S-δ18Oeq. diagrams,
strongly suggests that foraminiferal faunas sampled at the four stations
calcified during different periods of the year. This interpretation can be
refined by using the benthic foraminiferal δ13C, which is mainly
determined by the mixing of sea and river water. In the upper estuary
foraminifera mainly calcified in early spring and winter, whereas in the
lower estuary calcification mainly took place in spring, summer and autumn.
This new method provides insight into the complexity of estuarine benthic
foraminiferal stable isotope records. In addition, it can also be used to
obtain new information on preferred calcification periods of benthic
foraminiferal taxa in different parts of the estuary. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|